Preparation method of lithium ion battery pole piece containing organic matter coating

A technology of lithium-ion batteries and organic matter, which is applied in the direction of battery electrodes, secondary batteries, battery pack components, etc., which can solve the problems of difficult to ensure the adhesion between electrodes and separators, the inability to ensure the adhesion of electrodes, and the lack of high temperature resistance and easy deformation. problems, to achieve the effect of increasing the volumetric energy density of the battery, improving the space utilization rate, improving the bonding force and compaction density

Inactive Publication Date: 2019-10-22
江西力能新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the increase of battery capacity, it is difficult for the conventional technology to ensure the desired adhesion between the electrode and the separator, and it takes up space, and the stickiness of the electrode cannot be ensured, and it is not resistant to high temperature and easy to deform

Method used

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  • Preparation method of lithium ion battery pole piece containing organic matter coating
  • Preparation method of lithium ion battery pole piece containing organic matter coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The invention proposes a preparation method of a lithium-ion battery pole piece containing an organic coating, the battery pole piece

[0026] The preparation steps of sheet include 1. sol, 2. making slurry, 3. coating, 4. drying; the positive electrode active material or negative electrode active material of lithium ion battery and conductive agent, and conductive agent is conductive carbon black, bonding The agent (the ingredients on the market can be synthetic resin) is mixed in a weight ratio of 4:1:1, and the positive electrode slurry or negative electrode slurry is obtained after stirring. The stirred slurry and sol are mixed in a weight ratio of 2:1. The mixed slurry is coated on the surface of the organic coating. The raw materials of the organic coating are 40 parts of polyurethane, 10 parts of polyvinylidene fluoride homopolymer, 3 parts of dimethylformamide, and 5 parts of catalyst. Composed of 3 parts of surfactant, after uniformly mixing the organic raw mat...

Embodiment 2

[0028] Further optimization on the basis of Example 1, the raw material of organic coating consists of 40 parts of polyurethane, 10 parts of polyether glycerol, 10 parts of polyvinylidene fluoride homopolymer, 6 parts of phthalate, 3 parts of dimethylformamide, 5 parts of catalyst, and 3 parts of surfactant. After uniformly mixing the organic raw materials at 50 ° C, and standing for 0.5 hours to obtain an organic mixed solution, then adding ethanol to the organic mixed solution to stir the reaction, After 0.5h, the organic slurry is obtained, and the width of the coating is 6mm. Since the alkyd resin produced by polyether glycerin and phthalate is insoluble in ethanol, the residual impurities in the esterification reaction can be separated by ethanol. Then add curing agent (commonly used curing agent on the market) and adhesive (mainly composed of silica gel on the market) to the organic slurry and stir to finally make an organic coating. The speed of stirring and mixing is 3...

Embodiment 3

[0032] Further optimization on the basis of Example 2, the raw material of organic coating consists of 65 parts of polyurethane, 15 parts of polyether glycerol, 15 parts of polyvinylidene fluoride homopolymer, 13 parts of phthalate, 5.5 parts of dimethylformamide, 9 parts of catalyst, and 6 parts of surfactant. After uniformly mixing the organic raw materials at 50° C., and standing for 0.5 h to obtain an organic mixed liquid, then adding ethanol to the organic mixed liquid to stir the reaction, After 0.5h, the organic slurry is obtained, and the width of the coating is 6mm. Since the alkyd resin produced by polyether glycerin and phthalate is insoluble in ethanol, the residual impurities in the esterification reaction can be separated by ethanol. Then add curing agent (commonly used curing agent on the market) and adhesive (mainly composed of silica gel on the market) to the organic slurry and stir to finally make an organic coating. The speed of stirring and mixing is 3000 r...

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Abstract

The invention discloses a preparation method of a lithium ion battery pole piece containing an organic matter coating. The preparation method comprises the steps of: mixing a cathode active material or an anode active material of a lithium ion battery with a conductive agent and a binder, performing stirring to obtain cathode slurry and anode slurry, mixing the stirred slurry and sol, pre-coatingslurry containing organic coating prior to coating the slurry on a current collector after mixing, and performing drying to manufacture the battery pole piece after complete coating. The organic coating comprises the following components: polyurethane, polyether glycerol, polyvinylidene fluoride homopolymer, sodium bicarbonate, dimethyl formamide, a catalyst and a surfactant. The polyether glycerol can be subjected to esterification reaction with phthalic acid ester to generate alkyd resin, and the alkyd resin has the good insulation property.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing lithium-ion battery pole pieces containing an organic coating. Background technique [0002] The current lithium-ion battery structure mainly includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. Between any adjacent positive electrode sheets and negative electrode sheets, separators are used to separate them. As an important part of the current lithium-ion battery, the separator is a high-value-added material with high technical barriers among lithium-ion battery materials. The main function of the separator is to separate the positive and negative electrodes of the battery, absorb the electrolyte, and only pass through Lithium ions cannot pass electrons. [0003] With the increase of battery capacity, it is difficult for the conventional technology to ensure the desired adhesion between the elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M2/14H01M2/16H01M4/62H01M10/0525H01M10/654G01B11/06G01N9/00
CPCG01B11/0683G01N9/00H01M4/139H01M4/625H01M10/0525H01M10/654H01M50/403H01M50/411H01M50/46Y02E60/10
Inventor 侯伟侯民郭农庆
Owner 江西力能新能源科技有限公司
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