Art
[1]
This application claims the benefit of priority based on the date of May 2 Korea Patent Application No. 10-2016-0054164, 2016, and all information disclosed in the literature of the Korea patent application is included as part of the specification.
[2]
The present invention is an electrolytic solution and a lithium containing it comprising a poly dopamine-to a technique for absorbing a lithium polysulfide that is eluted from the positive electrode of the sulfur battery - in more detail relates to a sulfur battery is a poly dopamine contained in the electrolyte solution of lithium .
[3]
BACKGROUND
[4]
Recent electronic products, electronic devices, the small and light proceeds rapidly, such as communication equipment, and also increased demand for improved performance of the secondary battery to be in connection with environmental issues used as a power source for these products, as there is a need for an electric vehicle greatly soybean a situation which. Among them, the lithium secondary battery has received considerable attention as a high-performance battery, because a high energy density and a high standard electrode potential.
[5]
[6]
In particular, a lithium-sulfur (Li-S) cells SS bond is a secondary battery using a sulfur-based material having a (Sulfur Sulfur bond) as the positive electrode active material, a lithium metal as an anode active material. There is a main material of the positive electrode active material, the sulfur resource is very rich, and toxicity, it is advantageous to have a low weight per atom. In addition, the lithium-sulfur battery of the theoretical discharge capacity was 1675mAh / g-sulfur, and the theoretical energy density as 2,600Wh / kg, theoretical energy density of the other battery systems that are currently studies (Ni-MH cells: 450Wh / kg, Li- FeS cell: 480Wh / kg, Li-MnO 2 cells: 1,000Wh / kg, Na-S cells: due to the very high compared to 800Wh / kg) is the most promising from the battery cell that is being developed.
[7]
[8]
Lithium-oxidation reaction of lithium occurs in the negative electrode during the discharge reaction of the sulfur battery (Anode) and cathode (Cathode) The generated sulfur reduction. S of the annular sulfur before the discharge 8 I have a structure, reduction (discharge) the oxidation of SS bonds are broken As reduces the oxidation number of S, and as the oxidation (charge) when SS bond is formed again, increases the oxidation state of the S - by a reduction reaction to store and produce electrical energy. This reaction of the sulfur S of the ring-shaped 8- lithium polysulfide (Lithium polysulfide, Li linear structure by a reduction in reaction 2 S x will be converted to, x = 8, 6, 4 , 2), eventually the lithium polysulfide completely When the reduction finally lithium sulfide (lithium sulfide, Li 2 is to be generated S). By the process of reduction in the respective lithium polysulfide, lithium-sulfur battery of the discharge behavior is characterized by showing a staged discharge voltage in contrast to the lithium ion battery.
[9]
[10]
Li 2 S 8 , Li 2 S 6 , Li 2 S 4 , Li 2 S 2 lithium polysulfide in, in particular lithium Poly the sulfur oxidation number higher sulfide such as (Li 2 S x , usually x> 4) is the hydrophilic electrolyte easily soluble. Molten lithium in the electrolytic solution polysulfide goes diffuses away from the lithium polysulfides is produced by the positive difference density. The thus eluted from the positive electrode of lithium poly sulfide is lost out of the anode reaction zone of lithium sulfide (Li 2 it is impossible to gradually reduced to S). That is, since the anode and the cathode to beyond that present in the dissolved state lithium polysulfide will not be able to participate in the charge and discharge reaction of the battery, the amount of the sulfur material to participate in the electrochemical reaction is decreased in the positive electrode, after the lithium-sulfur It is a major factor causing the charge capacity of the battery decreases and energy reduction.
[11]
[12]
As well as a lithium polysulfides diffuse to the cathode include Li on the negative electrode surface, by direct reaction with the lithium addition to be suspended or precipitated in the electrolyte solution 2 to generate a problem of corrosion of lithium metal cathode, so fixed in the S form.
[13]
[14]
In order to minimize the dissolution of the lithium polysulfide, various, but studies for modifying the morphology (Morphology) of the carbon structure of the positive electrode composite material to form a composite filling the sulfur particles are in progress, these methods and the method of manufacturing complex, essential a situation that does not solve the problem.
[15]
Detailed Description of the Invention
SUMMARY
[16]
As described above, the lithium-sulfur cells slows due to lithium polysulfide that diffusion is eluted from the positive electrode proceeds, the charging and discharging cycles, there is a problem that the capacity and life characteristics of the battery decreases.
[17]
It is therefore an object of the invention is the lithium to inhibit the dissolution and diffusion of lithium polysulfide-to provide a sulfur battery electrolyte.
[18]
Another object of the invention is a lithium containing the electrolyte solution - to provide a sulfur battery.
[19]
Problem solving means
[20]
The present invention lithium-containing poly dopamine to an aspect of the - provides a sulfur battery electrolyte.
[21]
In addition, the lithium comprising the same-provide sulfur battery.
[22]
Effects of the Invention
[23]
Using this poly dopamine added electrolyte according to the present invention, since the role poly dopamine particles dispersed in the electrolyte solution are to adsorb lithium polysulfide that is eluted from the positive electrode during charge and discharge, inhibiting their proliferation, i.e., the shuttle reaction it is possible to improve the sulfur battery capacity and service life characteristics - the lithium to inhibit.
[24]
Brief Description of the Drawings
[25]
1 is configured with a lithium electrolyte solution which does not include a poly dopamine particles according to Comparative Example 1 of the present invention is a charge-discharge plot of sulfur battery.
[26]
2 is composed of a lithium electrolyte solution containing 0.1% by weight of a poly dopamine particles according to the first embodiment of the present invention is a charge-discharge plot of sulfur battery.
[27]
3 is composed of a lithium electrolyte solution containing a poly dopamine particles according to the second embodiment of the present invention 0.25% by weight - a charge-discharge plot of sulfur battery.
[28]
4 is configured with a lithium electrolyte solution containing a poly dopamine particles according to a third embodiment of the invention 0.5% by weight - a charge-discharge plot of sulfur battery.
[29]
5 is composed of a lithium electrolyte solution containing a poly dopamine particles according to Example 4 of the invention 1.0% by weight - a charge-discharge plot of sulfur battery.
[30]
Figure 6 is the lithium in accordance with the comparison of the present invention in Example 1 and Examples 1 to 4 - a graph showing the discharge cycle characteristics of the cell cycle of the sulfur.
[31]
Best Mode for Carrying Out the Invention
[32]
In the following, the invention and the accompanying drawings for an embodiment of the present invention to facilitate the self having ordinary skill in the art that belong to the reference embodiment will be described in detail. However, the invention is not limited to the embodiments may be implemented in many different embodiments, described below.
[33]
[34]
A lithium-sulfur battery electrolyte
[35]
The present invention lithium-containing poly dopamine (Polydopamine) - discloses a sulfur battery electrolyte. Specifically, according to the present invention lithium-sulfur battery electrolyte is composed, including a non-aqueous electrolyte solution containing a poly dopamine, poly dopamine, lithium salt and a non-aqueous liquid component.
[36]
[37]
Dopamine (Dopamine) is a monomeric form of a poly dopamine, it is well known as a neurotransmitter, which is found in the sea in the Red joining (Mussels) 3,4- dihydroxy -L- phenylalanine (3,4-Dihydroxy-L- phenylalanine: L-DOPA) is a molecular mimic of the molecule. In particular of dopamine oxidant-poly dopamine catechol (Catechol), amine (Amine) and imine (Imine) generated by the induced self-polymerization (Oxidant-induced self-polymerization) and electrochemical polymerization reaction (Electrochemical polymerization) it has a functional group, as well as organic matter, such as biological materials, synthetic polymers, because they form a very strong bond at the solid surface such as an electrode or a separator of the cell surface modification (surface reforming), the surface transformation (surface modification), the self-assembled multi-layer the formation of such a thin film (Self-assembled multilayer), nanocomposite thin film (nanocomposite thin film) is possible. Catechol functional group of dopamine is easily oxidized in the presence of oxygen itself - may form a poly dopamine by polymerization (Self-polymerization).
[38]
[39]
Specifically, dopamine in place of the harmful routine organic solvent in costly environment, the price is inexpensive, it was used dissolved in a buffer solution of environmentally friendly distilled water based (10mM tris buffer solution), which mussels through polymerization dopamine voluntary in order to form a polymer derived from a poly dopamine because it must be kept constant with a weak base solution (pH 8.5 for example) state.
[40]
[41]
These poly Dopamine is lithium in the form of particles (Particle) In the present invention it is preferably contained in the electrolytic solution of the sulfur battery. These poly dopamine particles can be produced by washing and drying to a powder and then stirring the mixed solution with a dopamine or a derivative thereof dissolved.
[42]
[43]
At this time, it is possible to adjust the average particle size of the poly-dopamine is prepared by adjusting the pH of the mixture liquid containing the dopamine. In one example, tris (NH 2 C (CH 2 OH) 3 in) or the addition of sodium hydroxide (NaOH), may be prepared in a particle size range of 100 to 800nm. More preferably lithium of the present invention the average particle size of the poly dopamine to be introduced into the sulfur battery electrolyte is applied to the particles in the 200 to 600nm range. If less than 200nm, there is a problem that the suction efficiency is lowered because the surface area is capable of adsorbing lithium polysulfide smaller if tricky process phase conditions, exceed 600nm.
[44]
[45]
The poly Dopamine is preferred to be 0.1 to 1.0% by weight based on the total weight of the total electrolyte, if they contain less than 0.1 wt% it can not ensure the adhesion effect of lithium polysulfide, a poly dopamine, more than 1.0% by weight If included in has the problem that the particle is a poly dopamine acts to reduce the electrical resistance efficiency.
[46]
[47]
The lithium salt of the present invention is a material that is readily soluble in non-aqueous organic solvent, for example, LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiB (Ph) 4 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , LiSO 3 CH 3 , LiSO 3 CF 3 , LiSCN, LiC (CF 3 SO 2 ) 3 , LiN (CF 3 SO 2 ) 2 , LiNO 3 may include, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate, lithium already one or more from the group consisting of draw.
[48]
[49]
The concentration of the lithium salt is, based on a number of factors such as the exact composition, the salt water solubility, dissolved salt conductivity, the battery charge and discharge conditions, the operation temperature and the lithium of other factors known in the battery field of the electrolyte mixture, 0.2 ~ 4M, specifically with 0.3 ~ 2M, 0.3 ~ 1.5M may be more specific. When used with less than 0.2M lowers the conductivity of the electrolyte can be reduced, the performance of the electrolytic solution, the use in excess of 4M lithium ion (Li to increase the viscosity of the electrolyte solution + can be a mobility of a) reduction.
[50]
[51]
In the non-aqueous organic solvent and the need to dissolve a lithium salt, a non-aqueous organic solvent of the present invention is, for example, N- methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, di ethyl carbonate, ethyl methyl carbonate, gamma-butyl lactone, 1,2-dimethoxy ethane, 1,2-diethoxy ethane, tetrahydroxy Franc (franc), 2- methyl tetrahydrofuran, dimethyl sulfoxide, 1, 3-dioxolane, 4-methyl-1,3-oksen, diethylether, formamide, dimethylformamide, acetonitrile, nitromethane, methyl formate, methyl acetate, phosphoric acid triester, trimethoxy methane, dioxolane derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, ether, acid may be used an aprotic organic solvent such as methyl propionate, ethyl And, the organic solvent may be a mixture of one or two or more organic solvents.
[52]
[53]
In order to improve electrolyte has charging and discharging characteristics and flame retardancy of the present invention, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, n- glyme (glyme), hexamethyl phosphoric acid amide tree, a nitro this may be added to benzene derivatives, sulfur, quinone imine dyes, N- substituted oxazolidinone, N, N- substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salts, pyrrole, 2-methoxy ethanol, aluminum trichloride . In some cases, in order to provide a non-flammable, it is also possible to further include a halogen-containing solvent such as carbon tetrachloride, ethylene trifluoride, and also possible to further include a dioxide carbon dioxide gas to improve high temperature storage characteristics, FEC (Fluoro-ethylene and the like carbonate), PRS (Propene sultone), FPC (Fluoro-propylene carbonate) can be further included.
[54]
[55]
A lithium-sulfur battery
[56]
A positive electrode according to the present invention is a lithium-sulfur battery as the anode in, may include a positive electrode current collector for supporting the positive electrode active material layer, and this.
[57]
[58]
The positive electrode active material may include elemental sulfur (Elemental sulfur, S8), a sulfur-based compound, or a mixture thereof. The sulfur-based compound is particularly, Li 2 S n (n≥1), an organic sulfur compound or a carbon-sulfur polymer ((C 2 S x ) n : and the like x = 2.5 ~ 50, n≥2) . These sulfur material alone is the conductive material and the composite is applied because there is no electrical conductivity.
[59]
[60]
The challenge may be a porous material. Therefore, as long as the conductive material having a porosity and conductivity can be used without limitation, and for example may be a carbonaceous material having a porosity. Such a carbon-based material may be used carbon black, graphite, graphene, carbon, carbon fibers and the like. In addition, a metallic fiber, such as a metal mesh; Copper, silver, metallic powders of nickel, aluminum and the like; Or polyester may also be used organic conductive materials such as polyphenylene derivatives. The conductive materials may be used alone or in combination.
[61]
[62]
The binder may include a thermoplastic resin or a thermosetting resin. For example, polyethylene, polypropylene, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), styrene-butadiene rubber, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, vinylidene fluoride-hexafluoro fluoro-propylene copolymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, ethylene-tetrafluoroethylene copolymer, poly-chloro-trifluoro-ethylene fluoride, beanie fluoride-penta profile Luo a propylene copolymer, propylene-tetrafluoroethylene an ethylene copolymer, an ethylene-chlorotrifluoroethylene copolymer, vinylidene fluoride-hexafluoropropylene-vinylidene copolymer, vinyl fluoride tetrafluoroethylene-perfluoroalkyl vinyl ether-tetrafluoroethylene copolymer, ethylene -, but can be used alone or in combination with acrylic acid copolymer and the like, it is not necessarily limited to, sugar If it can be used as a binder in the art it can be both.
[63]
[64]
A total of the positive electrode collector may be either as long as they can be used in the technical field and to the current collector, it is preferable to use the aluminum foam, foamed nickel, or the like having an excellent conductivity in detail.
[65]
[66]
Positive electrode as described above can be prepared according to a conventional method, specifically, to a positive electrode active material and the conductive material and a binder, the composition for forming a positive electrode active material layer was prepared by mixing in an organic solvent, applied and dried on the current collector, and optionally as it can be produced by compression-molding the current collector to improve the electrode density. At this time, the organic solvent may be uniformly dispersed in the positive electrode active material, binder and conductive material, it is preferable to use those that easily evaporates. Specifically, there may be mentioned acetonitrile, methanol, ethanol, tetrahydrofuran, water, isopropyl alcohol, and the like.
[67]
[68]
[69]
* A negative electrode according to the present invention is a lithium-sulfur battery as a cathode, it may optionally further include an anode current collector for the negative electrode active material layer and the support thereof.
[70]
[71]
The negative electrode in a lithium ion (Li as a negative electrode active material + ) for reversibly storing (Intercalation) or discharge (Deintercalation) material, a lithium ion (Li capable + material capable of forming a reversible lithium-containing compound to react with a) , it is possible to use a lithium metal or a lithium alloy. The lithium ion (Li + material capable of reversibly storing or discharging a) may be, for example, crystalline carbon, amorphous carbon, or a mixture thereof. The lithium ion (Li + material capable of forming a lithium compound include reversibly react with) may be, for example, tin oxide, titanium nitrate or a silicone. The lithium alloy is, for example, lithium (Li) and sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), Francium (Fr), beryllium (Be), magnesium (Mg), calcium ( Ca), may be a strontium (Sr), barium (Ba), radium (Ra), aluminum (alloy of a metal selected from the group consisting of Al), and tin (Sn).
[72]
[73]
The binder plays a role, such as paste screen of the negative electrode active material, active material, mutual adhesion between the active material and the adhesion of the entire house, a buffering effect for the active material expansion and contraction. More specifically, the binder is the same as described above in the binder of the positive electrode.
[74]
[75]
In addition, the anode may be a lithium metal or a lithium alloy. Non-limiting examples, the negative electrode may be a thin film of lithium metal, lithium, Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Ba, Ra, Al and at least one metal selected from Sn group It may be an alloy of.
[76]
[77]
The anode current collector may be one which is specifically copper, stainless steel, titanium, is selected from palladium, nickel, alloys thereof and combinations thereof. The stainless steel may be treated with carbon, nickel, titanium or silver surface, the alloy is aluminum-cadmium alloys. In addition, there may also be such as sintered carbon, a conductive agent surface-treated non-conductive polymer, or a conductive polymer is used.
[78]
[79]
Between the anode and the cathode has the conventional separation membrane can be interposed. The separator is a physical separation membrane has a function of separating the electrodes physically, so long as it is used in a conventional membrane can be used without particular limitation, and is especially low in resistance, yet preferably excellent in electrolytic solution humidification ability against ion mobility of the electrolyte solution.
[80]
[81]
Further, the separator makes it possible to transport of lithium ions between the positive electrode and the negative electrode, while separated from each other or insulated to the positive electrode and the negative electrode. This membrane is porous and may be made of a non-conductive or insulative material. The membrane may be either an independent member such as a film, or the anode and / or cathode in addition to the coating layer.
[82]
[83]
Specifically, the sole of a porous polymer film, such as ethylene homopolymer, propylene homopolymer, ethylene / butene copolymer, ethylene / hexene copolymers and ethylene / meta produced by the polyolefin-based polymers such as methacrylate copolymer porous polymer film or to use them to be stacked and, or conventional porous nonwoven, for example, and can be used, but the non-woven fabric of glass fiber, polyethylene terephthalate fiber, such as the melting point, and the like.
[84]
[85]
The lithium, wherein the positive electrode, a negative electrode and a separator included in the sulfur battery may be prepared according to the respective conventional ingredients and production process, and the lithium-appearance of the sulfur battery was Although there is no particular limitation, cylindrical shape with a can, prismatic, pouch (Pouch) may be a type or coin (Coin) type.
[86]
Mode for the Invention
[87]
Hereinafter, the embodiment example in detail to illustrate the present invention in detail will be described. However, embodiments according to the present invention can be modified in many different forms and the scope of the invention is not to be construed as limited to the embodiments set forth herein. Embodiments of the present invention are provided to more fully illustrate the present invention to those having ordinary skill in the art.
[88]
[89]
< Example 1>
[90]
1. The electrolyte prepared
[91]
LiN 1M (CF 3 SO 2 ) 2 is the dissolved-dimethoxyethane and 1,3-dioxolane-1: a poly dopamine powder in a mixture in a volume ratio of the first solution was prepared by addition of an electrolyte solution so that 0.1% by weight. The poly dopamine particle diameter of 400 ~ 500nm was used with purification.
[92]
[93]
2. The lithium-sulfur battery manufacturing
[94]
Sulfur / carbon complex (S / C composite: Sulfur + Super-P = 9: 1) 75% by weight, the conductive material (Denka black) 20 wt% and a binder (SBR: CMC = 1: 1) the positive electrode of 5% by weight of composition after the addition of DI water mixture to prepare a positive electrode slurry, the positive electrode was prepared by coating the entire aluminum current collector. However, the SBR is styrene-butadiene rubber (Styrene butadiene rubber) in the binder, CMC is carboxy methyl cellulose (Carboxymethyl cellulose).
[95]
[96]
It was used as a lithium foil having a thickness of about 150㎛ as an anode, a separator as 100㎕ by injecting the prepared electrolytic solution comprising a poly dopamine using a polypropylene film of thickness 20㎛ coin-cell (Coin cell) in the form of a lithium- sulfur battery was manufactured.
[97]
[98]
< Example 2>
[99]
Example 1 in the same manner as the lithium-sulfur battery was prepared, which was used an electrolyte solution poly dopamine powder containing 0.25% by weight.
[100]
[101]
< Example 3>
[102]
Example 1 in the same manner as the lithium-sulfur battery was prepared, which was used for the electrolyte is poly dopamine powder contained 0.5% by weight.
[103]
[104]
< Example 4>
[105]
Example 1 in the same manner as the lithium-sulfur battery was prepared, which was used a poly dopamine powder the electrolytic solution contains 1.0% by weight.
[106]
[107]
< Comparative Example 1>
[108]
Using an electrolytic solution that does not contain a poly dopamine powder and lithium in the same manner as in Example 1, was prepared the sulfur battery.
[109]
[110]
< Experimental Example 1>
[111]
In order to confirm the shuttle of sulfur cell inhibitory effect, cut-to-the Examples 1-4, Comparative Example 1 for the prepared lithium accordance off voltage (Cut-off voltage) is a 1.5 ~ 2.8 V, C-rate is 0.1 C It was performed by the charge and discharge test. The loading of the electrode mAh 1.223 / cm 2 , the amount of current when testing a 0.1C rate is 0.188 x 10 -6 was A, In a charge-discharge test results are shown in Figs. 1 to 5 according.
[112]
[113]
1, when the shuttle reaction occurs when 2.3 ~ charging still do not end in the vicinity of 4V to cause a delayed response, and, Figures 2 to 5, the shuttle reaction is inhibited varying degrees but it can be seen that the charging is terminated correctly. This, to the use of an electrolyte solution applied over a poly dopamine can be confirmed that the shuttle reaction is inhibited.
[114]
[115]
< Experimental Example 2>
[116]
Example 1-4 and Comparative Example 1 in accordance with the produced lithium-the charging / discharging the battery to the respective sulfur 0.1 C / 0.1 C, repeating 50 cycles, the discharge capacity of each cell (Specific discharge capacity) was measured. 6, the Examples 1 to lithium 4-sulfur battery of Comparative Example 1 Li - the initial capacity is large, and cycle life characteristics than the sulfur battery also was confirmed that the improved, particularly of Example 3 Lithium-sulfur battery that it can be seen that represents the best characteristics.
[117]
Industrial Applicability
[118]
Li accordance with the present invention, because they reliably receive the sulfur battery has excellent discharge capacity and output characteristics and capacity retention rate, cell phones, handheld devices, and hybrid electric vehicles, such as a laptop computer, a digital camera (Hybrid electric vehicle: HEV), etc. it is useful for the electric car sector.
[119]
Thus, according to another implementation of the invention, the lithium, the battery pack including the battery module, and it comprises a sulfur battery unit cell it is provided. The battery module or battery pack, the power tool (Power tool); Electric Vehicles (Electric vehicle, EV), hybrid electric vehicles, and plug-in hybrid electric vehicle: electric vehicle that includes (Plug-in hybrid electric vehicle PHEV); Or the power storage may be used as any one or more of the middle- or large-sized devices for the power supply of the system.

Claims
[Claim 1]
Li-containing poly dopamine-sulfur battery electrolyte.
[Claim 2]
The method of claim 1 wherein the poly dopamine lithium, characterized in that the mean particle diameter of particles in the form of 200 to 600nm - sulfur battery electrolyte.
[Claim 3]
The method of claim 1 wherein the poly dopamine lithium, characterized in that 0.1 to 1.0% by weight of the entire electrolytic solution based on the total weight-sulfur battery electrolyte.
[Claim 4]
According to claim 1, wherein said electrolyte is lithium, it characterized in that the non-aqueous liquid electrolyte-sulfur battery electrolyte.
[Claim 5]
The method of claim 1, wherein the electrolytic solution is LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiB (Ph) 4 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , LiSO 3 CH 3 , LiSO 3 CF 3 , LiSCN, LiC (CF 3 SO 2 ) 3 , LiN (CF 3SO 2 ) 2 , LiNO 3 , chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and lithium already lithium comprises a lithium salt at least one member selected from the group consisting of draw-sulfur battery electrolyte.
[Claim 6]
The method of claim 1, wherein the electrolyte is N- methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, gamma-butyl lactone, 1,2- dimethoxyethane, 1,2-diethoxy ethane, tetrahydroxy Franc (franc), 2- methyl tetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, 4-methyl-1,3-oksen, di ether, formamide, dimethylformamide, acetonitrile, nitromethane, methyl formate, methyl acetate, phosphoric acid triester, trimethoxy methane, dioxolane derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2 imidazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, ether, methyl propionate and lithium comprising the organic solvent at least one member selected from the group consisting of ethyl-sulfur before Solution for.
[Claim 7]
anode; cathode; A separator interposed between the positive electrode and the negative electrode; And lithium-containing electrolyte which is impregnated in these - in the sulfur batteries, the electrolyte is any one of claims 1 to 6, characterized in that lithium is any one of an electrolytic solution of an anti-sulfur battery.