High-power lithium ion battery pole piece and preparation process thereof

A lithium-ion battery and a preparation process technology are applied in the field of high-power lithium-ion battery pole pieces and the preparation process thereof, and can solve the problems that the lithium-ion battery is difficult to meet requirements, high equipment requirements, complex processes, etc., and achieves low internal resistance, The effect of high conductivity and sufficient and uniform mixing

Inactive Publication Date: 2014-07-16
QUANZHOU JINTION ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous development of electric vehicles, it is difficult for lithium-ion batteries with 3-5C rate discharge to meet the requirements of existing electric vehicles. A high-power lithium-ion battery that can continuously output 5-40C current is needed to meet The power energy of the above-mentioned means of transportation
[0004] The invention patent with the publication number CN 102618097A discloses a conductive base coating for lithium ion batteries, lithium ion battery electrodes and lithium ion batteries. Black is used as a conductive agent. First, dry powder is crushed and classified, and then added to CMC glue for crushing, classification, and dispersion. Finally, SBR is added to stir to obtain a conductive base coating. The process is complicated, and several different equipment are required for processing.

Method used

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  • High-power lithium ion battery pole piece and preparation process thereof
  • High-power lithium ion battery pole piece and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Slurry preparation

[0021] (1) Preparation of conductive paste

[0022] First, 30g of Ketjen Black and polyurethane ball milling with a volume of 1 / 3 of Ketjen Black for 30-120 minutes; Vacuum bake at ℃ for 120 minutes, the vacuum degree is: -0.09MPa; weigh 100g of organic solvent and heat it to 40~60℃; add the binder to the organic solvent, stir in vacuum for 60~80 minutes, the stirring speed is: 800 ~2000 rpm to get the glue; add 30g of baked Ketjen Black to the glue, stir at high speed for 100~240 minutes, and the stirring speed is 1800~3000 rpm; stir slowly in vacuum for 30~60 minutes Remove air bubbles and adjust viscosity, the viscosity range is 500~1000mpa·s, and sieve to obtain conductive paste.

[0023] (2) Preparation of cathode slurry

[0024] First weigh 5000g of lithium cobalt oxide, Super P222g, VGCF111g, and 222g of binder, respectively, and place them in a vacuum oven at 120°C for 60-180 minutes; then vacuum-stir the binder and organic solvent for...

Embodiment 2

[0031] It is basically the same as Example 1, the main difference is that the conductive agent is composed of 70% Ketjen black and 30% VGCF, and the components of the positive electrode slurry include lithium cobaltate 5000g, Super P191g, VGCF81g, binder 191.3g, The components of the positive electrode slurry include mesophase carbon microspheres 3000g, Super P64.9g, VGCF64.9g, and binder 113.5g.

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Abstract

The invention relates to a high-power lithium ion battery pole piece and a preparation process thereof. The battery pole piece is provided with a current collector, wherein the positive and reverse sides of the current collector are coated with conductive base layers; the conductive base layers are coated with active substance coatings; each conductive base layer consists of a conductive agent and an adhesive according to a mass ratio of 75-95 percent to 7-25 percent. The preparation process comprises the following steps: mixing the adhesive with an organic solvent, thus obtaining an adhesive solution; stirring the conductive agent and the adhesive solution, thus obtaining slurry; grinding the slurry by using a colloid grinder, regulating the viscosity to be 300-1,000mpa.s, screening to obtain conductive slurry, coating the positive and reverse sides of the current collector with the conductive slurry, drying and compacting to obtain the conductive base layer; and coating the conductive base layer with the active substances, drying and compacting to obtain a high-power lithium ion power battery piece. The electric conductivity of the battery piece can be improved; for the battery piece under the same surface density condition, the rate discharge performance of the battery and a discharge platform are high, and over 94 percent of capacity can be preserved under the 40C-rate current discharge condition.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a high-power lithium-ion battery pole piece and a preparation process thereof. Background technique [0002] As the world is facing increasingly serious environmental and energy problems, seeking high-efficiency and renewable green energy is an inevitable trend in today's social development and scientific and technological progress. At present, the power battery has been one of the new green power sources that the world's developed countries focus on developing. [0003] Lithium-ion batteries have the advantages of no pollution, no memory effect, high specific energy, and light weight. They have been widely used in mobile communications and notebook computers since the early 1990s, and have developed rapidly. At present, lithium-ion batteries have also begun to be used as power sources for electric vehicles such as electric vehicles, electric mopeds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M4/04H01M4/139
CPCH01M4/0419H01M4/1391H01M4/623H01M4/625H01M10/0525Y02E60/10
Inventor 陈端典黄昌荣陈文明李培坤
Owner QUANZHOU JINTION ELECTRONICS
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