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Method For Producing Cathode Slurry For Lithium Secondary Battery And Cathode For Lithium Secondary Battery Produced Thereby

Abstract: The present invention provides a method for producing a cathode slurry for a lithium secondary battery, the method comprising the steps of: adding a cathode active material, a conductive material, a binder polymer, and a dispersant to a solvent and mixing the same to obtain a slurry containing 69 to 74 % by mass of solid contents; primarily dispersing the slurry for 50 to 100 minutes such that the transfer rate of the solid contents in the slurry ranges from 3 to 6 m/s; and secondarily dispersing the primarily dispersed slurry for 5 to 20 minutes such that the transfer rate of the solid contents in the slurry ranges from 14 to 27 m/s, wherein the transfer rate of the solid contents denotes the distance measured over each time interval, by which the solid contents transfer due to a force applied to the slurry in a dispersion device used to disperse the slurry.

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Notices, Deadlines & Correspondence

Patent Information

Application #
Filing Date
28 May 2019
Publication Number
52/2019
Publication Type
INA
Invention Field
ELECTRICAL
Status
Email
IPO@KNSPARTNERS.COM
Parent Application
Patent Number
Legal Status
Grant Date
2023-11-30
Renewal Date

Applicants

LG CHEM, LTD.
128, Yeoui-daero, Yeongdeungpo-gu, Seoul 07336

Inventors

1. MOON, Il-Jae
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122
2. KIM, Woo-Ha
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122
3. AHN, Byoung-Hoon
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122
4. CHOY, Sang-Hoon
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122

Specification

The present invention relates to a lithium secondary battery positive electrode produced from this production method and a lithium secondary battery positive electrode slurry. [2] This application claims the priority based on the Korea Patent Application No. 10-2017-0081359, filed on June 27, 2017, and all contents disclosed in the specification and drawings of that application are incorporated in this application. BACKGROUND [3] In recent years, the demand for secondary batteries as an energy source is rapidly increasing as mobile computers, portable telephones, the increasing development of technology and demand for mobile devices such as cameras. Among them, the lithium secondary battery shows a high energy density and operating potential, and the cycle life is long, self-discharge rate is known a low advantages, are commercially available and widely used. [4] The study, depending on the interest in environmental issues grows like a gasoline vehicle, electric vehicle that can replace the use of fossil fuels, such as diesel vehicles, hybrid electric cars of the main causes of air pollution has been a lot of progress. Such an electric vehicle, a hybrid electric power source, but a nickel hydrogen metal secondary batteries are widely used in automobiles, are being actively studied to use a lithium secondary battery of high energy density and discharge voltage, and in some commercialization. [5] Recently, a high-capacity, long-life characteristics of the lithium secondary battery is required to suppress the electric binder migration during the entire coating the current collector by car increase the solid content of the positive electrode slurry as a large battery is developed for used in (binder migration) electrode adhesion there is an attempt to increase. However, the increase in viscosity, depending on the solid content is increased of the positive electrode slurry, the slurry is transferred when filter clogging, a slurry coating (application) is not smoothly performed problem occurred. Detailed Description of the Invention SUMMARY [6] The present invention is to provide a method for producing intended to overcome the problems described above, an object of the present invention is positive electrode slurry solids content is high, but lithium viscosity does not have a when the control transfer and coating problems secondary battery positive electrode slurry of . [7] It is another object of the invention to a lithium-containing anode, and the cathode is the positive electrode slurry prepared by the above method is applied if provided leg. Problem solving means [8] In accordance with one aspect of the present invention, adding a positive electrode active material, a conductive material, a binder polymer and a dispersant in a solvent and mixed, to give a solids content of 69 to 74% by weight slurry; The step of the primary dispersion for 50 minutes to 100 minutes, the moving speed of the solid content of the slurry so that the slurry is in the range of 3 to 6 m / s; And the dispersion of the first such that the range of the car the moving speed of the solid component 14 of a dispersed slurry slurry to about 27 m / s, and comprising the step of second-order dispersion for 5 minutes to 20 minutes, the moving speed of the solid content of the slurry the manufacturing method of the distance that the solid moved by the force applied to the slurry in the interior of the balancer using shows a time interval for a lithium secondary battery positive electrode slurry is provided. [9] Moving speed of the solid component shows a distance (m) that the solid content is moved every second in the slurry by the shearing force (shear force) generated by the friction of the slurry is rotated when said member with a slurry of the dispersion members provided on the balancer . [10] Moving speed of the solid component can be calculated by the following equation (1): [11] Equation 1 [12] The moving speed of the solid component (m / s) = 2πR (m) * A (1) [13] Wherein [14] R is the radius of the dispersion member for a slurry, [15] A is divided by the revolutions per minute (rpm) of the member for a slurry dispersed to 60 seconds. [16] The positive electrode slurry may include a positive electrode active material is 90 to 98% by weight of the solid content, the conductive material of 0.5 to 5% by weight, the binder polymer from 0.5 to 5% by weight, and a dispersant from 0.2 to 0.4 mass%. [17] The positive electrode active material may have an average particle diameter (D50) of 0.5 to 20 ㎛. [18] The positive electrode active material is 0.5 g 5 / cm 3 may have a tap density of. [19] The conductive material from the second dispersed slurry may represent a mean particle size (D50) of the distribution of 0.9 to 1.48 ㎛. [20] The binder polymer is polyvinylidene fluoride, poly hexafluoro propylene may be characterized in that a polyvinylidene fluoride of one or two or more mixtures selected from the group consisting of an ethylene copolymer and chlorotrifluoroethylene. [21] The positive electrode slurry may be a viscosity at a shear rate of 0.1 / s after the second dispersion after the secondary dispersing 3 to 12 Pa.s. Effects of the Invention [22] According to the manufacturing method of a lithium secondary battery positive electrode slurry according to the present invention, while increasing the solids content to a predetermined range by performing a control process of the dispersion over the second speed can be adjusted viscosity. The prepared positive electrode slurry, and transfer at the time of producing the positive electrode and the coating is smooth, it is possible to ultimately give a good adhesion to the cathode. [23] The anode slurry is subjected to a secondary dispersion process is superior to the effect dispersing the conductive material, the uniformity and dispersibility of the total slurry improved from this, the slurry viscosity may greatly contribute to reduction. Best Mode for Carrying Out the Invention [24] Hereinafter, the present invention will be described to assist understanding of the present invention in more detail. Herein and in the terms or words used in the claims is general and not be construed as limited to the dictionary meanings are not, the inventor can adequately define terms to describe his own invention in the best way on the basis of the principle that the interpreted based on the meanings and concepts corresponding to technical aspects of the present invention. [25] Method of manufacturing a lithium secondary battery positive electrode slurry according to one aspect of the present invention includes the steps of dispersing the positive electrode active material, a conductive material, a binder polymer and a dispersant in a solvent to obtain a positive electrode slurry (S1); Dispersing the slurry primary (S2); And a step (S3) of the second dispersion to said first adding the dispersed slurry. [26] [27] Is characterized in the present invention, is carried out the step (S1) is to regulate the solid content of the positive electrode slurry to 69 to 74% by weight, or 69.5 to 73% by weight. At this time, the "solid content" refers to the remaining components other than the solvent in the positive electrode slurry, that is, the positive electrode active material, a conductive material, a binder, a positive electrode material of a polymer and a dispersant. The solids content of the binder to reduce the migration rate is reduced according to the solvent to be evaporated during drying, and then coating the electrode, if present at a high content of the above range increases the electrode adhesion. Such increased adhesion can reduce the binder content in the overall composition, by increasing the content of the active material as a binder is reduced it is possible to increase the energy density of the electrode. [28] If the solid content of the positive electrode slurry is less than 69% by mass, the larger the received binder migration effect the drying process of the positive electrode slurry may reduce the adhesive strength in the final electrode. On the other hand, when the solid content exceeds 74 wt%, to reduce the distance between the electrode material particles, the slurry is taking place collisions between particles, the particles from which the agglomerates of particles formed by the aggregation can result in a rapid increase in viscosity. [29] [30] The positive electrode slurry was a cathode active material based on the total amount of solid content may comprise 90 to 98% by mass, or 95 to 98% by weight. When the content of the positive electrode active material to satisfy the above range, there is no capacity degradation, it is also appropriate adjustment of the relative content of the binder and the conductive material can be prevented from degradation, such as adhesion to the positive electrode current collector and a conductive lower. [31] As the positive electrode active material is a lithium-containing transition and the metal oxide is preferably used, for example, Li x CoO 2 (0.5

Documents

Application Documents

# Name Date
1 201917021061-IntimationOfGrant30-11-2023.pdf 2023-11-30
1 201917021061-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [28-05-2019(online)].pdf 2019-05-28
2 201917021061-PatentCertificate30-11-2023.pdf 2023-11-30
2 201917021061-STATEMENT OF UNDERTAKING (FORM 3) [28-05-2019(online)].pdf 2019-05-28
3 201917021061-PROOF OF RIGHT [28-05-2019(online)].pdf 2019-05-28
3 201917021061-8(i)-Substitution-Change Of Applicant - Form 6 [28-11-2022(online)].pdf 2022-11-28
4 201917021061-POWER OF AUTHORITY [28-05-2019(online)].pdf 2019-05-28
4 201917021061-ASSIGNMENT DOCUMENTS [28-11-2022(online)].pdf 2022-11-28
5 201917021061-PA [28-11-2022(online)].pdf 2022-11-28
5 201917021061-FORM 1 [28-05-2019(online)].pdf 2019-05-28
6 201917021061-FORM 3 [01-11-2022(online)].pdf 2022-11-01
6 201917021061-DECLARATION OF INVENTORSHIP (FORM 5) [28-05-2019(online)].pdf 2019-05-28
7 201917021061-FORM 3 [12-05-2022(online)].pdf 2022-05-12
7 201917021061-COMPLETE SPECIFICATION [28-05-2019(online)].pdf 2019-05-28
8 201917021061.pdf 2019-06-05
8 201917021061-ABSTRACT [23-11-2021(online)].pdf 2021-11-23
9 201917021061-CLAIMS [23-11-2021(online)].pdf 2021-11-23
9 201917021061-OTHERS-310519.pdf 2019-06-06
10 201917021061-COMPLETE SPECIFICATION [23-11-2021(online)].pdf 2021-11-23
10 201917021061-OTHERS-310519-.pdf 2019-06-06
11 201917021061-Correspondence-310519.pdf 2019-06-06
11 201917021061-FER_SER_REPLY [23-11-2021(online)].pdf 2021-11-23
12 201917021061-FORM 3 [15-11-2019(online)].pdf 2019-11-15
12 201917021061-OTHERS [23-11-2021(online)].pdf 2021-11-23
13 201917021061-Certified Copy of Priority Document (MANDATORY) [27-11-2019(online)].pdf 2019-11-27
13 201917021061-PETITION UNDER RULE 137 [22-11-2021(online)].pdf 2021-11-22
14 201917021061-FER.pdf 2021-10-18
14 201917021061-OTHERS-291119.pdf 2019-12-05
15 201917021061-Correspondence-291119.pdf 2019-12-05
15 201917021061-FORM 3 [21-05-2021(online)].pdf 2021-05-21
16 201917021061-FORM 18 [19-04-2021(online)].pdf 2021-04-19
16 201917021061-FORM 3 [29-05-2020(online)].pdf 2020-05-29
17 201917021061-FORM 3 [23-11-2020(online)].pdf 2020-11-23
18 201917021061-FORM 3 [29-05-2020(online)].pdf 2020-05-29
18 201917021061-FORM 18 [19-04-2021(online)].pdf 2021-04-19
19 201917021061-Correspondence-291119.pdf 2019-12-05
19 201917021061-FORM 3 [21-05-2021(online)].pdf 2021-05-21
20 201917021061-FER.pdf 2021-10-18
20 201917021061-OTHERS-291119.pdf 2019-12-05
21 201917021061-Certified Copy of Priority Document (MANDATORY) [27-11-2019(online)].pdf 2019-11-27
21 201917021061-PETITION UNDER RULE 137 [22-11-2021(online)].pdf 2021-11-22
22 201917021061-FORM 3 [15-11-2019(online)].pdf 2019-11-15
22 201917021061-OTHERS [23-11-2021(online)].pdf 2021-11-23
23 201917021061-Correspondence-310519.pdf 2019-06-06
23 201917021061-FER_SER_REPLY [23-11-2021(online)].pdf 2021-11-23
24 201917021061-OTHERS-310519-.pdf 2019-06-06
24 201917021061-COMPLETE SPECIFICATION [23-11-2021(online)].pdf 2021-11-23
25 201917021061-CLAIMS [23-11-2021(online)].pdf 2021-11-23
25 201917021061-OTHERS-310519.pdf 2019-06-06
26 201917021061-ABSTRACT [23-11-2021(online)].pdf 2021-11-23
26 201917021061.pdf 2019-06-05
27 201917021061-COMPLETE SPECIFICATION [28-05-2019(online)].pdf 2019-05-28
27 201917021061-FORM 3 [12-05-2022(online)].pdf 2022-05-12
28 201917021061-DECLARATION OF INVENTORSHIP (FORM 5) [28-05-2019(online)].pdf 2019-05-28
28 201917021061-FORM 3 [01-11-2022(online)].pdf 2022-11-01
29 201917021061-FORM 1 [28-05-2019(online)].pdf 2019-05-28
29 201917021061-PA [28-11-2022(online)].pdf 2022-11-28
30 201917021061-ASSIGNMENT DOCUMENTS [28-11-2022(online)].pdf 2022-11-28
30 201917021061-POWER OF AUTHORITY [28-05-2019(online)].pdf 2019-05-28
31 201917021061-PROOF OF RIGHT [28-05-2019(online)].pdf 2019-05-28
31 201917021061-8(i)-Substitution-Change Of Applicant - Form 6 [28-11-2022(online)].pdf 2022-11-28
32 201917021061-STATEMENT OF UNDERTAKING (FORM 3) [28-05-2019(online)].pdf 2019-05-28
32 201917021061-PatentCertificate30-11-2023.pdf 2023-11-30
33 201917021061-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [28-05-2019(online)].pdf 2019-05-28
33 201917021061-IntimationOfGrant30-11-2023.pdf 2023-11-30

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