Lithium ion battery high-nickel positive electrode material and preparation process thereof

A technology for lithium-ion batteries and cathode materials, which is applied in the field of high-nickel cathode materials for lithium-ion batteries and its preparation process, can solve the problems of long dissolution time of polydene tetrafluoride, improve compaction density and electrical conductivity, and increase compactness. degree, the effect of capacity enhancement

Inactive Publication Date: 2020-05-15
河南新太行电源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of long dissolution time of polyvinylidene fluoride (PVDF)

Method used

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  • Lithium ion battery high-nickel positive electrode material and preparation process thereof
  • Lithium ion battery high-nickel positive electrode material and preparation process thereof
  • Lithium ion battery high-nickel positive electrode material and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] High nickel positive electrode A: D10: ≥5 μm, D50: 9-15 μm, D90: ≤30 μm.

[0034] 1. Prepare raw materials according to the percentage and weight in the following table to make high-nickel cathode slurry for lithium-ion batteries:

[0035]

[0036] 2. Preparation of cathode slurry

[0037] 2.1 Glue preparation: gradually disperse 4.2Kg of instant polyvinylidene fluoride into the NMP being stirred in a double planetary stirring pot (produced by Guangzhou Hongyun Mixing Equipment Co., Ltd.) for mixing, and prepare a glue solution with a mass fraction of 10.7%. Do not turn on the circulating water, stir at the speed of revolution 15rpm, disperse 1500rpm, the stirring time is 60min; after stirring for 10min, recover the materials around the stirring paddle in time, and keep the vacuum <-0.08MPa during the stirring process;

[0038] 2.2 Premix: Add 205.2Kg of high-nickel positive electrode and 4.8Kg of conductive carbon black into another stirring pot, stir thoroughly fo...

Embodiment 2

[0048] High nickel positive electrode A: D10: ≥5 μm, D50: 11-14 μm, D90: ≤30 μm.

[0049] 1. Prepare raw materials according to the percentage and weight in the following table to make high-nickel cathode slurry for lithium-ion batteries:

[0050]

[0051] 2. Preparation of cathode slurry

[0052] 2.1 Glue preparation: Gradually disperse 3.3Kg of instant polyvinylidene fluoride into the stirring NMP in a double planetary stirring pot (Guangzhou Hongyun Mixing Equipment Co., Ltd.) Turn on the circulating water, stir at the speed of revolution 15rpm, disperse 1500rpm, the stirring time is 60min; after stirring for 10min, recover the materials around the stirring paddle in time, and keep the vacuum <-0.08MPa during the stirring process;

[0053] 2.2 Premix: Add 213Kg of high-nickel positive electrode and 2.1Kg of conductive carbon black into another stirring pot, stir thoroughly for 10min at a speed of 15rpm in revolution and 500rpm in dispersion, and then add 25Kg of glue an...

Embodiment 3

[0063] High nickel positive electrode A: D10: ≥5 μm, D50: 10-14 μm, D90: ≤30 μm.

[0064] 1. Prepare raw materials according to the percentage and weight in the following table to make high-nickel cathode slurry for lithium-ion batteries:

[0065]

[0066]

[0067] 2. Preparation of cathode slurry

[0068] 2.1 Glue preparation: Gradually disperse 3.3Kg of instant polyvinylidene fluoride into the stirring NMP in a double planetary stirring pot (Guangzhou Hongyun Mixing Equipment Co., Ltd.) Turn on the circulating water, stir at the speed of revolution 15rpm, disperse 1500rpm, the stirring time is 60min; after stirring for 10min, recover the materials around the stirring paddle in time, and keep the vacuum <-0.08MPa during the stirring process;

[0069] 2.2 Premix: Add 198.6Kg high-nickel positive electrode and 3.0Kg conductive carbon black into another stirring pot, stir thoroughly for 10min at a speed of 15rpm in revolution and 500rpm in dispersion, and then add 25Kg of...

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Abstract

The invention discloses a lithium ion battery high-nickel positive electrode slurry mixing process. A high-nickel positive electrode slurry comprises a high-nickel positive electrode, a carbon black Super-p conductive agent, a CNT conductive agent, and adhesives PVDF and NMP, and the process comprises the following steps of (1) adding the adhesive and NMP into a planetary stirrer, stirring, preparing an adhesive glue solution with the solid content of 6.0-12.0%, and standing for later use; (2) adding the carbon black Super-p conductive agent and a high-nickel positive electrode into a double-planet stirrer, quickly and uniformly stirring, and then adding part of the glue solution in the step (1) and a CNT conductive agent for premixing; and (3) adding the residual glue solution into a planetary stirrer, uniformly stirring, and then revolving to prepare the positive electrode slurry with the solid content of 68%-75%. Through the application of the cathode material premixing and mixing process, the use problem of the high-nickel cathode in the battery is solved, the mixing uniformity is improved, meanwhile, the batching time is shortened, and the specific capacity and the rate discharge performance of the lithium ion battery are greatly improved.

Description

Technical field: [0001] The invention relates to a lithium-ion battery, in particular to a lithium-ion battery high-nickel cathode material and a preparation process thereof. Background technique: [0002] In recent years, lithium-ion batteries have developed rapidly, and the application of power batteries has gradually shown increasing enthusiasm. The cathode material is the key factor to improve the rate performance of lithium-ion batteries, and it is an important direction for the current power system to reduce the weight. Compared with the traditional nickel-cobalt lithium manganese oxide material, the high-nickel cathode has obvious advantages in terms of gram capacity. The method is mostly a wet-mixing process route, and the particle size of the applied materials is generally large. If the binder is a high-molecular polyvinylidene fluoride, its dissolution rate is slow. For high-nickel positive electrodes with high specific capacity, the normal dispersion method is not...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/04H01M10/0525B82Y30/00
CPCH01M4/623H01M4/628H01M4/625H01M4/04H01M10/0525B82Y30/00Y02E60/10
Inventor 乔歌歌王亮张志锋李伟莉
Owner 河南新太行电源股份有限公司
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