Specification
This application is based on the priority date of November 17, Korea Patent Application No. 10-2017-0154184, and November 16, 2018 Date of Korea Patent Application No. 10-2018-0141758 2017 10 claiming the benefit, and that Korea Patent Application all information disclosed by document is included as a part of the specification.
The present invention increases the fraction of the material to provide a non-reversible capacity in the irreversible additives by minimizing Lyrium by-product manufacturing method of the non-reversible additive for significantly reducing the gelling of the positive electrode material composition containing the same In the irreversible prepared by 15- containing additive It relates to a positive electrode material, and a lithium secondary battery comprising the same.
[Background Art]
There is demand for secondary batteries is increasing rapidly as the energy source, as the technical development and demand for mobile devices increases. The secondary battery a high energy of 20 have a density and voltage, long cycle life, self-discharge rate is widely used commercially available low Lyrium secondary battery.
Further, as a cathode material 25 reviews Lyrium metal that was but can implement a high-capacity, the energy density is very high, during the repeated charge and discharge dendritic growth (( 1611 ( 11 : 6 There are safety issues and the short problems cycle life by).
Accordingly, a material that can replace the ring of cerium metal exhibit high dose was not harm the use of the negative electrode active material having a high energy density, silicon, tin, 30 there has been a number of studies and suggestions on, or an alloy of these. For example, silicon-based 2019/098764 1 » (1 ^ 1 {2018/014125
물질은 리륨과의 화합물 형성반응을통해 리륨을가역적으로흡장 및 방출하며 이론적 최대 용량이 약 4200 ^八 (9366 ^/ , 비중 2.23)으로서 탄소계 물질에 비해서 매우크기 때문에, 고용량음극 재료로서 유망하다 .
However, these cathode materials are for the initial charging and discharging efficiency is low, the initial 5 has a large irreversible capacity loss problem.
This can provide a lithium ion supply source, or storage to a cathode material for, and a method using a material which is activated electrochemically after the first cycle so as not to degrade the overall cell performance, to overcome the irreversible capacity loss of the anode studies suggest It was. Specifically, the sacrificial anode material or 10 you as irreversible additives (or over-discharge agent) 0 there is a method of using the ritum anode for a nickel-based oxide including excess lithium, such as.
However, the lithium nickel based oxide is mainly there is prepared a nickel oxide, nickel carbonate, is reacted with an excess of Lyrium oxide, wherein the unreacted lithium oxide (Nishi 0 ), or niye, you 0¾ by-products such as the final lithium nickel produced system 15 will remain in the oxide. Lyrium lithium oxide and by-products remaining in the nickel-containing oxide are decomposed during the initial cell cycle 0 , ¥, etc., as well as to generate the excess gas by reacting with the binder component in the manufacture composition for electrode production for such by-products and to you of 조성물의 점도 상승 또는 겔화를 초래하고 이로 인해 활물질층 형성을위한 전극조성물의 도포시 균일한도포가어렵고 20 그 결과로서 전지의 특성이 저하되는 문제가 있다.또한, 유리 니(犯 및/또는 니 에에서 유래하는유리 니는 양극의 사이클효율을 저하시키는문제도 있다.
[Prior art document]
[Patent Document 1] Korea Patent Publication No. 2003-0076153 call (published 26.9.2003)
25
[Detailed Description of the Invention]
[SUMMARY]
The present invention to solve the above-described problem, increase the Lyrium fraction of the nickel-containing oxide of the irreversible additives unreacted the content of nigye by-products such as lithium oxide 30 can be reduced to reduce the composition viscosity increase or gelation of the electrode prepared 2019/098764 1 » (1 ^ 1 {2018/014125
Which is an object of the present invention to provide a method of manufacturing a nonreciprocal additives.
The invention may also be manufactured in a manufacturing method for a lithium secondary battery positive electrode material comprising a non-reversible additive content of nigye by-products, such as unreacted substances, down, and to include them for providing Lyrium secondary battery exhibits excellent electrical and chemical properties and that for the purpose.
[Technical Solution]
That herein and in the terms or words used in the claims is general and not be construed as limited to the dictionary meanings is not is the inventor can adequately define terms to describe his own invention in the best way 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만한다.
Will be described below Lyrium secondary battery comprising a positive electrode material, and it includes a method of producing a nonreciprocal additives, irreversible additive prepared by the above method contained in one Lyrium secondary battery positive electrode material according to an embodiment of the invention.
Method for producing a non-reversible additives contained in the lithium secondary battery positive electrode material according to an embodiment of the present invention
Needle 2+ 1 ^ 0 2+ ,附0 mitni. 20 is X: : 2 a Lyrium excess precursor combined physically in a molar ratio of, is mixed with a further 0, and the heat treatment, 11 2 ^ 1 ^ 0 to 2 ^ , 0 및 니 20 가 X : ' : 의 몰 비로 물리적으로 결합된 리륨 과량의 전이금속산화물을제조하는과정을포함한다.
However, wherein -0.2 < 3 <0 0.2, 0 <1 ) <1, 0 < ( a <0.2, and:
X + = 1, and, X with the "+" = 1, the reference, is at least 0.8, X 'is 0.93
Is selected first is an element on the paper.
Thus, the manufacturing method according to the embodiment is manufactured in a conventional way
0 and for further mixing and heat treatment, needle that remains unreacted 0 to
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By addition reaction, did the irreversible additives 2+附1-1¾02 + (; increasing the fraction of the, relatively, it is possible to reduce the amount of nigye by-products such as unreacted Lyrium oxide bar, to provide a Needle more glass to the cathode where as well as to compensate for lower efficiency of the negative electrode effectively, the gel in the electrode composition caused by the presence of the compound may Lyrium sikilsu significantly reduced.
The molar ratio of the materials constituting the lithium excess precursor and the lithium-excess of the transition metal oxide is a concept that is proportional to the fraction, in the present invention, X + = 1 , and, X '+ / = 1 to the popular Zune, X, 7 ,
and X ',', 2 , the value of "is determined.
More specifically, X and + = 1, X 1 + / = 1 as the standard, X is 0.8 or more, X 'is at least 0.93, X < X ', 7 > V ' satisfies the relationship and>, and å 는 0 초과 0.21 이하이며, '는 0 이상 0.09 이하이며, 상세하게는, 는 0.8 이상 0.9 이하이고,X 는 0.93 이상내지 1.0 이하일 수 있으며, 상기 는 0 이상 0.055 이하일수있다.
That is, in the case of the ritum excess precursor prepared by the above conventional method, practically, needle that provides a non-reversible capacity 2+ 1- 0 2 + (; the molar ratio of your山0 of 2+ based on the total of a and 0, ( 80% to 90% , while below the lower ally, Nishi 2 + 1 102+ (: and, based on the total of the one you 0 20 molar ratio of the relatively high. 그러나, 본 발명과 같이, 잔여 니 20 와 반응할 수 있는 0를 추가적으로 혼합하여 열처리하는 경우, 리툼 과량의 전구체에 원래 존재하고 있던 0와 추가된 0가 잔여 니 20 와 더 반응함으로써, 니 2+ ; 1-102+ . a molar ratio of 112 ^ 1 ^ 0 2 based on the whole of, and出0, X ' is 0.93 or more, a 93% raise to above, needle 20, the molar ratio of the relatively lower the conditions, X < X, 7 > 7' 및 å '이며, 는 0이상 0.09이하, 상세하게는, 는 0이상 0.055 이하인조건을만족시킬수있다.
On the other hand, the addition amount of 0 to be mixed further in the production method and of 0 were present in the Li-excess precursor molar ratio, needle 20 , taking into account the molar ratio of, you by the reaction by the price of the heat treatment: "a molar ratio 를 11 2 ^ 11- ^0 2^ 및 0의 전체를 기준으로 0.93 이상, 즉,93% 이상이 될 수 있는 양이라면 한정되지 아니하고, 리륨 과량의 전구체 1 몰 대비 미반응 니 20 의 몰 비보다 from small range, a portion can be added to a large extent.
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However, ◦ that if added too much, but rather you 20 and do not response remains in 0 , so that a lot, overall reduction in your山molar ratio, and 0 increasing the molar ratio of the bar substantially, whilst the basis of the same weight the haejulsu material that comes less undesirable.
Thus, the added 0 is Lyrium excess precursor 1 unreacted you mole compared to 20 from a range between the molar ratio of, huni the reaction is completed in a portion to a large extent -山2+ may be added to the extent that an increase in d molar ratio, specifically, the lithium excess precursor 1 moles compared to 0.12 to a molar ratio of, more specifically, the lithium excess precursor 1 moles compared to 0.52 to about 2 can be mixed in a ratio of moles, the specific amount added is, as described above, lithium It was present in excess precursor zero and the molar ratio, needle 20 , taking into account the molar ratio of, by reaction with additional heat treatment 112 ^ 11
It can be mixed to be an amount that is higher.
The heat treatment is specifically, an inert atmosphere at 500 to 800 ° ( : from 12 hours to 24 is carried out for a time.
The heat treatment in an inert atmosphere to produce side reaction inhibition
It is carried out in the atmosphere and, given the superiority of double increase in the reaction efficiency and side reactions generate inhibitory effect ¾ may be performed in the atmosphere or in the atmosphere.
In addition, when the heat treatment is carried out in the above temperature range, conventional Lyrium unreacted materials and, which is more present in excess precursor 0 which may be made to facilitate the reaction the other hand, handageona rather occurs a side reaction by the addition of heat treatment , since not a reactant not decompose, at this time, with good efficiency without the concern about the decrease in the discharge capacity per unit weight that can occur, lowering of the operating voltage and decrease of cycle characteristics, needle 2 1 + 3 dae ¾0 2+ <: increasing the molar ratio and, needle 2 can be reduced in a molar ratio of 0. When more specifically euroneun considering the excellent effect according to the heating temperature control, the heat treatment is 600 ° [to 700 : further more specifically, 650 ^ to 700 ° ( : can be carried out at a temperature of.
In the heat treatment it is 12 hours to 24 may be performed for a time. The 2019/098764 1 » (1 ^ 1 {2018/014125
The execution time of the heat treatment 12 is less than the time, due to the short reaction time, the unreacted lithium oxide and 0 can be minimal this is hardly sufficient reaction with, and the reaction efficiency is lowered due to the cathode material in Li ryumgye by-product reduction. On the other hand, the execution time of heat treatment 24 if it exceeds the time, there is a risk of overreaction occurs, and 5 may be a less efficient process such that the firing time is too long. More specifically, 15 hours to 20 can be performed during the time.
Needle 0 a X : 7 ' : including the Lyrium excess transition metal oxide combined with mole ratio of physical and _ 0.2 £ £ 0.2, 0 < 1, 0 £ : ( £ 0.2 and, X , + a 1 a
10 based, X is 0.93 or more and is 0 or more to 0.09 or less, wherein the (X . 1 , when Ah 00,?, And 8 is selected from the group consisting of 1 is the element number of days on the paper. The excess of lithium precursors for the production of irreversible additive according to the invention are prepared by heat treatment, for example after mixing the raw materials of the lithium raw material, the nickel raw material and the element.
15, heat treatment for manufacturing the Lyrium excess precursor and an inert atmosphere
650 to 700 ° (: from 12 hours to 24 is carried out for a time.
The reaction of the raw material for the lithium source material and the element to be produced in the heat treatment temperature and time ranges can take place sufficiently and there can minimize the unreacted material.
20 wherein the lithium source material is a lithium-containing oxide sulphate nitrate, acetate a carbonate, oxalate, citrate halide hydroxides or oxy-hydroxide may be used, and specifically, you ¥, needle, air, niye, you抑. ¾ 0, you you比1 ^ 1, you you 1,抑期0 Needle 11 0, you open必抑(: 00 : Needle, or or ( ¾0 and the like. Of these it may be used any one or a mixture of two or more.
25 when considering the dual-in during the reaction with the nickel raw material reaction efficiency and secondary reaction generation reducing effect, the source material is Lyrium you 0 is the number of days.
The nickel source material is a nickel oxide ( 0 is the oxide or hydroxide containing nickel as the number of days) or nickel hydroxide ((細)).
30- acetate a carbonate oxalate citrate, halide, hydroxide or 2019/098764 1 » (1 ^ 1 {2018/014125
Oxa there is a hydroxide or the like can be used. The above is by being included by substituting part of nickel contained Lyrium nickel oxide to be finally produced that serve to improve the thermal stability and structural stability, specifically, & 1 ,,, ¾¾,, ^, 0 0, or ¾ transition metal element is 2, 3 or 5 having an addition hwasu like;
5 amphoteric elements having an oxidation number of 3 and sigwa; And, and, and myoro doeneungeot days selected from the group consisting of, in double above & 1. ¾位, town, city, 0, 0,?, And 8 are selected from the group consisting of doeneungeot days.
Raw material for the lithium source material, the nickel raw material, and elements such as the end of the formula is prepared first including ritum and nickel in the lithium nickel composite oxide of 10 can be used in an amount that to meet the compositional ratio of metal elements.
Further, when the sintered mixture of the raw material I may be optionally further added. The sintering agent is specifically ■, ■ 41炯3 , or (■ a compound containing ammonium ions, such as ^ filtered; ¾ 03 or 203, metal oxides such as; Or附(: 12 or greater than 0 (: 12 , and the like metal halides, such as, any one or both of these 15 or more mixture may be used. The sintering agent is nickel raw material 1 with respect to moles of 0.01 mol to 0.2 can be used in an amount of mol. To improve the sintering properties when used within the aforementioned content range effect excellent, it can prevent the initial capacity deterioration of the positive electrode material to improve performance and charge-discharge proceeds during the battery.
Further, when a mixture of the above raw materials, moisture removing agent is more selective to 20 may doelsudo added. Specifically, the water-removing agent roneun may be made of citric acid, tartaric acid, glycolic acid or maleic acid or the like, there is one or a mixture of two or more of them may be used. The moisture remover with respect to 1 mol of nickel raw materials 0. Immolation to 0.2 can be used in an amount of mol.
Depending on the production method as described above, and an excess of precursor Lyrium be prepared, 25 In this case, the Lyrium excess precursor, 1 [ 2 ^ 11 - ^ 0, 2 ^ 0 and with a compound having the same formula, you 20, the unreacted Lyrium oxide, and nickel oxide, such as is present is contained in the reaction product.
Therefore, according to the present invention, these non-reducing the amount of reaction of lithium oxide,丄山that substantially provides to compensate for the irreversible efficiency Lyrium - 30 02+ (; as to increase the amount of, and the 0 addition of the mixture the heat treatment process 2019/098764 1 » (1 ^ 1 {2018/014125
To perform
In the irreversible additives prepared as is unreacted Lyrium prepare irreversible additive total weight, as measured by titration, of lithium by-products such as oxides 3 weight % to less than specifically 2 wt % and can contain as less and more than Specifically, 52 wt % or less specifically, 1.5 wt % you below 0比and 0 to 0.5 weight % , is in detail with 0 to 0.3 wt % may include senior of. When stirred in distilled water for unreacted lithium oxide, measured according to titration method for, you and the Needle 2) 3 bar, with you in the Needle is decomposed by 2 ( : 03 maneunji this from the content of Fig content of unreacted lithium oxide there is less able to confirm.
10 due to the significantly reduced the Li by-products in this way, there is no risk of gelation during the mixing process for producing a positive electrode comprising the same. Accordingly, it can exhibit an excellent effect than in the case of using the anode material is a conventional non-reversible additives.
In another aspect, the present invention provides a positive electrode material containing a positive electrode and a non-reversible additives hwalmul paint according to the invention.
15 The amount of the additive is non-reversible cathode material compared to the total weight of 0.1 weight % to 10 weight % , specifically 1 weight % to 5 weight % , more specifically 1 weight % to 3 weight % may be.
Out of the range, from 0.1 wt % is less than, is not obtained a cathode efficiency compensation effect of the addition to the irreversible additives 10 wt % of more than 20 case, the electrode volume expansion coming from the cathode, as the use of a series negative increase It can result in a lifetime retirement hadeungwa problem.
The positive electrode material than a conventional additive comprising a non-reversible according to the invention
M0 + bars which can increase the amount of the reduced you 0 due to the content of the material is the anode 25, it is possible to significantly reduce the gelation of the coating when the composition of the whole cathode material house for producing a state or the positive electrode produced, and the cycle characteristics It can be improved.
The present invention also provides an anode that is coated on the whole of the anode material is the cathode current collector; Cathode that is applied to the surface of the negative electrode material is a negative electrode current collector comprising a negative active material; and
30 separator interposed between the positive electrode and the negative electrode;
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And an electrode assembly that includes a lithium secondary battery of the structure built with the electrolyte in a battery case.
In addition, with the positive electrode material non-reversible additive and the positive electrode active material described above, it can further comprises a conductive material and a binder.
Specifically, as the positive electrode active material is, for example, needle (: 0 0 2,
니1]1202, 니 (1^30¾¾1¾)02 (0<크<1, 0<1)<1, 0<0<1 , 8~比+。=1) , 니 1-^(¾02, 11001- ! ,니 1서1\111102(0<(1< 1), I ( 예)04 (0<3<2, 0<1)<2, 0<0<2 , Si+b+c=2) , 匕 ¾- 刀4, 니 ¾-ᅩ004 (0<6<2), 니(:0灰)4,
And, it may be used any one or a mixture of two or more of them.
As it is used to impart conductivity to the conductive electrode material, without causing a chemical change in the constituted battery as long as it has electron conductivity can be used without particular limitations. Specific examples thereof include carbon black, acetylene black, Ketjen black, channel black, furnace black lamp black thermal black, carbon-based materials such as carbon fibers, graphite such as natural graphite or artificial graphite; copper-nickel, aluminum or silver, a metal powder or metal fibers, conductive whiskers such as zinc oxide and potassium titanate; a conductive metal oxide such as titanium oxide; may be made of conductive polymers of the like, or polyphenylene derivatives, of which 1 alone or two have more than a mixture it may be used with respect to the conductive material by weight of total cathode material 1 wt.% to 30 wt % it may be included as a.
The binder serves to improve the adhesion of the entire positive electrode active material and attached to and between the positive electrode active material particles and the home. Specific examples thereof include polyvinylidene fluoride ssae 的, vinylidene fluoride-propylene-fluoro-hex
Hydroxypropylcellulose in a Woods, reproduced cellulose cellulose polyvinylpyrrolidone in money tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene polymer犯? Sulphonated Table, styrene-butadiene rubber seedlings幻fluorine rubber, or the like of these various copolymers and of which one species alone, or two . There are at least a mixture can be used The binder for the cathode material the total weight 1 wt % to about 30 wt % may be included as a.
As the positive electrode current collector so long as it has suitable conductivity without causing chemical changes in the battery is not particularly limited, for example stainless steel, aluminum, nickel, titanium, sintered carbon, or aluminum or stainless carbon, nickel titanium to the steel surface, it is such this can be used such that a surface treatment. in addition, the five positive electrode collector is 3im to 500 can increase the adhesive strength of the positive electrode active material may have a thickness of _, to form fine irregularities on the current collector surface. For example, a film, a sheet, a foil, such as a net, a porous body foam nonwoven material may be used in various forms.
In addition, the negative electrode, the negative electrode material onto a negative electrode current collector on the total, including the negative electrode active material 10 may be prepared in the form as applied to the material and the negative electrode with the negative active material, too, and can further comprise a binder, such as copying and also described above.
The negative electrode active material, a reversible intercalation and de-intercalation of lithium compounds are available can be used. Roneun specific example carbonaceous material such as artificial graphite, natural graphite, graphite carbon dioxide fibers, amorphous carbon; Si, Al, Sn, Pb, 15 Zn, Bi, In, M g, Ga, Cd, Si alloy, Sn alloy or the like upon alloy Lyrium alloyed with the possible metallic compound; Si0 x (0
LiC 4F9S03 , LiN (C 2F5S03) 2 , LiN (C 2F5S02) 2 , of Li N (CF3S02) 2. Of LiCl, of Li the I, 또는
LiB (C 204) 2 and the like can be used. The concentration of the lithium salt is 0.1M to 2. 0M preferably used within the range. When ritum salt concentration is within the above range, since the electrolyte have an appropriate conductivity and viscosity, and can exhibit excellent performance electrolyte,
5, the lithium ions can be moved efficiently.
The electrolytic solution has improved life property of addition to the constituents battery, the battery capacity is decreased inhibition, for the purpose of improving the discharge capacity of the battery, for example, haloalkyl, such as ethylene carbonate, difluoromethyl alkylene carbonate compound, pyridine, triethyl phosphite, triethanolamine, cyclic ether, ethylenediamine, n- 10 glyme ( glyme), hex triamide, nitrobenzene derivatives, sulfur, quinone imine dyes, N- substituted oxazolidinone, N, N- substituted already Jolly Dean, ethylene glycol dialkyl ether, ammonium salts, pyrrole, 2- methoxyethanol, or more than one type of additive, such as aluminum trichloride may be further included. At this time, the additive based on the total weight of the electrolytic solution of 0.1 wt % to 5 wt % can be included as a.
15 because they reliably receive the lithium secondary battery has excellent discharge capacity and output characteristics and capacity retention ratio according to the present invention as described above, a mobile phone, laptop, handheld devices such as digital cameras, and hybrid electric vehicles (hybr id electr ic vehicle, HEV) can be used as a power supply device for electric automotive applications, such as.
20 - Brief description of the drawings;
Figure 1 is an experimental example 3 is a graph showing viscosity measurements according to.
[Mode for Carrying out the invention]
Hereinafter, the present invention is self having ordinary skill in the art 25 will be described in detail an embodiment of the present invention to be carried out easily. However, the invention is not to be implemented in many different forms and limited to the embodiments set forth herein.
30 5.5g were mixed and, N 2 ° C under an atmosphere 685 in Figure 18 after heat treatment for a time,
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Cool the reaction to the result to obtain the irreversible additive particles.
1 120 50§ 0 136§, and as a raw material of the element (■) 2四0 4 to 5 5.5§ and mixed and then, ¾ ° C under an atmosphere 685 in FIG. 18, the heat treatment for a time, and Celsius 685 in FIG. 18 for a time after cooling again to heat treatment by the reaction of the results to give a non-reversible additive particles.
10 1 120 50§, 0 136 as a raw material of each element and 4 ), 0 4 the
5.5§ and mixed and then, under ¾ bunwiga ° C 685 in FIG. 18 in the heat-treated for a time and reaction yield 0 7.6§ (This is you present in the obtained reaction product of 20 mole ratio standard of 0.5 by adding a mixture misappropriation) after Celsius 685 in Figure 18, the heat treatment for a time and cooling the resultant to obtain a non-reversible additive particles.
15
1 20 50§, 0 136§, and as a raw material of the element (ssae 4 ) 2四0 4 to 5.5 yogwa then a solution under an atmosphere ¾ ° C 685 in FIG. 18 for a heat treatment time, and 0 to the obtained reaction 2.6§ ( This is you present in the obtained reaction product of 20 mol of the non-reference
20 0.17 misappropriation) further mixed after Celsius 685 in FIG. 18 was heat-treated for a time and to obtain a non-reversible additive particles by cooling the resultant.
Content as measured in accordance with the by-product ritum 油 titration
25 Example 1 , 2 and Comparative Examples 1 , 2 were jeukjeong lithium by-product content by performing a titration against an irreversible additive particles prepared.
Specifically, distilled water 100 irreversible additives in此1 ( ¾ into a 5 by stirring minutes was dissolved by-products ritum 0.敗1 was titrated with acid-base titration using. The melt from the non-reversible lithium by-products compared to the total weight of the additive to obtain 30 wt % was calculated in terms of a value.
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Calculation is performed as follows. If appropriate in the embodiments and the comparative example base titration acid additives of the non-reversible proper 1 can be obtained geunreul, these 1176 has a turning point. Twice (Needle (1) of the two竹) of the acid corresponding to the back on the basis of these inflection point 3 is 2 due to the needs of the ship acid, 2 you from) 20 ) 3 of 5 to obtain a content, corresponding to the front amount of acid ( X amount竹) of the acid corresponding to the back in) from both 0 (B) of ppaensan, after obtaining the content of the Needle, compared to the total weight of the additive by weight of non-reversible each of % was converted to.
The results of Example 1 and 2 in the non-reversible additives of, compared to your total irreversible additive by weight (content of犯is 2.5 wt. % Measured and you ¥ below 3 content is also of 0.35 10 wt. % Can be confirmed that extremely lowered below.
On the other hand , any treatment Comparative Example FIG not one case of the content of the Needle 4 wt % and more than you 2 content of ¥ also 0.4 wt % can be confirmed that more than.
Comparative Example 2 also reduce slightly the amount of Lyrium by-product is one you the content of a 3 weight % : not less than, needle ( 0 Fig content of 0.3 wt % that is still desired to more than 15 did not produce the degree of decrease of the effect.
¾¾) Analysis
The embodiments 1 to 2, and Comparative Examples 1 to 2, a non-reversible additives prepared in 20 methyl carbon black conductive material and a binder blood in a weight ratio in a pyrrolidone solvent, 92.5: 3.5: 5 were mixed in a ratio and producing a positive electrode slurry, after applying it to the entire aluminum current collector to prepare a positive electrode and dried to rolling.
25, the analysis equipment was used. The results are Table 1 are shown in.
From the positive electrode before the charge as described above you * 0 in irreversible additives 2+ can be determined and the molar ratio of 0.
The molar ratio is calculated as follows. Performing _ Analysis of the anode and the conductive material is not considered because keuneun Bullion target appears too small in the binder
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Width from the (width of the peak in the middle) 61 calculates the (first method is based to calculate the molar ratio thereof.
When done this way, non-reversible additive prepared by the process according to the invention (Examples 1 and 2 ) is, you 2 + 1 O 0 2 + the amount of the. 1 [2 ^ 1 ^ 0 2 + a 0, and 5 based on a full 93% can be confirmed that the increase in later. On the other hand, Comparative Example
Also it was not reached, Comparative Example 2, if you have 2+ ; nye 0 2+ : Although the content of the slight increase, 93% was not reached there.
必 content analysis
比control of the positive electrode 10 prepared as described above
by making (X八: V 1110 (1 6 with
4.2 to 0.1 (: charged, and analyzes the peak density by a _ analysis of charged positive electrode Needle 20 calculated the molar ratio. The results are Table 1 are shown in.
Here,) Sample used in the analysis is then filled犯0 and a positive electrode obtained by decomposing the non-1 were analyzed as follows.
15 by the filled, you 2+此1-1¾02 + (; the case structure is changed, the position of the peak intensity after one side, so the charging of the charging 0 peak 20 compared to the intensity of the peak I 1 61 ( based on the amount of 0 obtained from the first method, needle 20 and the number of moles of alcohol.
Obtained Needle 20 obtained from the number of moles of the 1 [2 + ^ 1 1 ^ 0 2 + + 0 1 mol of 20 was converted to the basis.
For example, before the peak intensity of the zero charge 10 ◦ and wherein 0 is the occupying ratio of 5 mole % when Rani 20 the intensity of the peak 50 when the 1 20 the ratio of 2.5 mol % and estimates d
And comparing the value obtained therefrom, knee of the embodiments according to the present invention 20, the 25 content of 0.09 , whereas more than mole, the content of the comparative example is 0.14 it can be confirmed that in excess.
Viscosity Measurement
30 Example 1 to 2 and Comparative Examples 1 to 2, a non-reversible additives, 2019/098764 1 manufactured by » (1 ^ 1 {2018/014125
As a cathode active material LiNio.sMno.iCoo.i02, a carbon black conductive material, and a (binder正-methylpyrrolidone in a weight ratio in a solvent money 4.6: 87.9: 3.5: 5 were mixed in the ratio of the positive electrode slurry was prepared.
To measure the viscosity of the positive electrode slurry, Inc. Brookfield 2孔5 was used as the viscometer, 30 (加1 to prepare a slurry of about 1200印01 by rotating the blade of the viscometer to measure the viscosity, also the result 1 shown in.
For reference, only you必used as a positive electrode active material, not including the weight of the yo-yo irreversible additives ^ it was measured together with a slurry comprising as a reference example.
10 The results of Example 1, 2, a positive electrode slurry containing the additive of the non-reversible you 0. 8 1 ^ 11 (). 1 0 0 (). 1 0 2 , while showing the viscosity characteristics similar to the positive electrode slurry including only, Comparative Examples 1 and 2, the positive electrode slurry containing the additive of the non-reversible can be confirmed that a relatively high viscosity. From this, Comparative Examples 1 and 2 are by-products, such as still Lyrium 4 wt. % In many cases, the above improvements in gelling of the composition 15 can be expected that negligible.
Producing a secondary battery ritum
Example 1 , 2 and Comparative Examples 1 to 2 to a non-reversible additives prepared in 20 was prepared Lyrium secondary battery in the same way to use.
Specifically, the Experimental Example 3 was used as the positive electrode slurry prepared in. In addition, as a negative electrode active material 0 is 10 wt % of the artificial graphite is mixed with
the near keuseon), a carbon black conductive material, and I a (正binder in a weight ratio from methyl pyrrolidone solvent of 90: 5: 5 negative electrode mixture in a proportion of for forming a 25 to prepare a composition, and a negative electrode was prepared by applying it onto the copper collector.
And via a porous polyethylene separator between the positive electrode and the negative electrode prepared as described above, manufacturing the electrode assembly and an electrolyte solution is injected after the electrode assembly into the case which is located in the inner case to prepare a paper Lyrium leg. The electrolyte
30 Ethylene carbonate / dimethyl carbonate / ethyl methyl carbonate (防/ 01: / mu 1: a mixture of
2019/098764 1»(:1^1{2018/014125
Volume ratio = 3/4/3 in an organic solvent consisting of a) 1 was prepared by dissolving the phosphate (you) in the lithium-hex-fluoro ^ concentration .
Charge capacity measuring
The manufactured secondary batteries 0.1 (: a 4 to 0:八: V is charged, 0.005 (: was charged to until the cut-off, 0.1 (: to 2 to (X discharge by measuring the charge capacity, and the results Table 1 shows the.
The results of Example 1 and 2. When using the positive electrode containing the additives of the non-reversible, can be confirmed that the charge capacity increases. This means that if you are using a non-reversible additive according to the invention, you + -山+: the content is increased in the relatively initial efficiency is lowered irreversible capacity loss is greater during the initial charge-discharge 0 can excellently supply than whilst in based negative active material and, since less by-products Lyrium prevent gelation due to enable the expression capacity of the positive electrode active material.
[Table 11
[Industrial Applicability]
Method of manufacturing a nonreciprocal additive according to the invention, ◦ by additional mixing, heat treatment, increasing the fraction of the Li-Ni-based oxide of the irreversible additives, to reduce the content of nigye by-products such as unreacted lithium oxide, the composition according to the electrode production 의 점도 상승 또는 겔화를 감소시킬 있다. Accordingly manufactured using the cathode material comprising the same Lyrium secondary battery can exhibit excellent electrical and chemical properties than
WE CLAIM
Ritum for producing a non-reversible additives contained in the secondary battery positive electrode material
A method,
Needle 2+ 1- 0 2+ 0 mitni 20 is X: V: 2 combined physically in a molar ratio of Lyrium excess precursor, in combination with further附0 and heat-treated, 1 2 + ^ 1 ^ 0 2 +, 0 mitni 20 is X : 7 ' :' the physically coupled to a molar ratio Lyrium excess
Irreversible additive method for producing transition comprising the step of preparing a metal oxide:
However, the above formula, _0.2 < 3 <0 .2, 0 <於1, 0 £ (: a <0.2,
X a + = 1, X ' in the + = per person, X is 0.8 or more, X 1 is at least 0.93, X and ¾ ñ satisfies the relationship, and the ' X + 1 on the
Based on a 2 is less than 0 and 0.21, X '+ on the 1st of is not less than 0 but not more than 0.09, and the cant. !始, town, city, € 0, and, an element on the one member selected from the disconnected group consisting of.
[Claim 2]
Standing ateo in claim 1, X + = 1, and, X '+ a = per person, X is 0.9 or less than 0.8, X' is 0.93 or more to 1.0 or less, the irreversible additive method.
[Claim 3]
The method of claim 1 wherein, X '+ based on one of or less than 0, 0.055, method of producing the irreversible additives.
[Claim 4]
The method of claim 1, wherein the added 0 is 0.比to 1 moles compared to lithium excess precursor that is mixed in from the production method 2 , non-reversible additive method are mixed in a molar ratio of.
[5.]
The method of claim 1, wherein the heat treatment, an inert atmosphere at 500 to
2019/098764 1»(:1^1{2018/014125
800 ° (: In the, method of producing the irreversible additives is carried out for 12 hours to 24 hours.
[Claim 6]
The method of claim 5, wherein the inert atmosphere is ¾ atmosphere or in an atmosphere of, 5 irreversible additive method.
[Claim 7]
The method of claim 5, wherein the heat treatment is 650 to 700 ° (: In the, method of producing the irreversible additives is carried out for 12 hours to 24 hours.
10
[Claim 8]
Claim 1 as a positive electrode material comprising a non-reversible additives, and the positive electrode active material produced by the production method according to term
15 in a molar ratio of Lyrium include an excess of the transition metal oxide and, coupled to the physical - 0.2 <3 <0.2, 0 <1 ) <1 , 0 < (: <0.2 and, X '+ on the 1st of', X ' 0.93-is at least, 2' is less than 0 but not more than 0.09, wherein the (. 1此, Oh, when, 0 0 ) I 3 , and 3 is selected from the group consisting of one material element of the positive electrode on the paper .
20 [Claim 9]
The eight negative electrode is coated on the negative electrode material is a negative electrode current collector comprising a negative active material in the positive electrode is coated on the positive electrode material and a positive electrode current collector according to a further
A separator interposed between the positive electrode and the negative electrode
25, the electrode assembly is a lithium secondary battery of the structure built with the electrolyte in a battery case comprising a.
[10.]
The method of claim 9, wherein the negative electrode active material, to systems that are represented by the following general formula (1) 30 Lithium secondary batteries containing the substance:
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¾ (1)
Here, 0 < X <2 is.