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Binder for lithium ion battery compound pole piece, preparation method for binder, compound pole piece, battery core, and lithium ion battery

A technology of lithium-ion batteries and binders, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as pole piece misalignment, achieve the effects of avoiding displacement, avoiding thermal runaway, and improving the uniformity of dispersion

Active Publication Date: 2016-02-03
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a binder for composite pole pieces of ion batteries to solve the problem of dislocation of pole pieces in the prior art

Method used

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  • Binder for lithium ion battery compound pole piece, preparation method for binder, compound pole piece, battery core, and lithium ion battery
  • Binder for lithium ion battery compound pole piece, preparation method for binder, compound pole piece, battery core, and lithium ion battery
  • Binder for lithium ion battery compound pole piece, preparation method for binder, compound pole piece, battery core, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The lithium-ion battery composite pole piece binder of the present embodiment is made up of the following components by weight: 1 part of ethylene-vinyl acetate copolymer, 120 parts of barium sulfate particles, 1.2 parts of thickener carboxymethyl Sodium cellulose, 98.8 parts of water, wherein the particle diameter D50 of the barium sulfate particles is 0.3 μm.

[0045] The preparation method of the binder for the above-mentioned lithium-ion battery composite pole piece comprises the following steps:

[0046] 1) Sodium carboxymethyl cellulose is added into water to make an aqueous solution of sodium carboxymethyl cellulose;

[0047]2) Add an ethylene-vinyl acetate copolymer emulsion with a solid content of 40% to the sodium carboxymethylcellulose aqueous solution obtained in step 1), and stir for 2 hours to obtain a mixed solution;

[0048] 3) Add barium sulfate particles to the mixed solution obtained in step 2), stir for 5h, vacuum degassing, adjust the viscosity to ...

Embodiment 2

[0055] The lithium-ion battery composite pole piece binder of the present embodiment is made up of the following components by weight: 0.5 parts of ethylene-vinyl acetate copolymer, 100 parts of barium sulfate particles, 1 part of thickener carboxymethyl Sodium cellulose, 99 parts of water, wherein the particle diameter D50 of barium sulfate particles is 0.3 μm.

[0056] The preparation method of the binder for the above-mentioned lithium-ion battery composite pole piece comprises the following steps:

[0057] 1) Sodium carboxymethyl cellulose is added into water to make an aqueous solution of sodium carboxymethyl cellulose;

[0058] 2) Add an ethylene-vinyl acetate copolymer emulsion with a solid content of 38% to the sodium carboxymethylcellulose aqueous solution obtained in step 1), and stir for 2 hours to obtain a mixed solution;

[0059] 3) Add barium sulfate particles to the mixed solution obtained in step 2), stir for 8 hours, vacuum defoam, adjust the viscosity to 100...

Embodiment 3

[0066] The lithium-ion battery composite pole piece binder of the present embodiment is made up of the following components by weight: 1.5 parts of ethylene-vinyl acetate copolymer, 150 parts of barium sulfate particles, 1.5 parts of thickener carboxymethyl Sodium cellulose, 98.5 parts of water, wherein the particle diameter D50 of barium sulfate particles is 0.3 μm.

[0067] The preparation method of the binder for the above-mentioned lithium-ion battery composite pole piece comprises the following steps:

[0068] 1) Sodium carboxymethyl cellulose is added into water to make an aqueous solution of sodium carboxymethyl cellulose;

[0069] 2) Add an ethylene-vinyl acetate copolymer emulsion with a solid content of 45% to the sodium carboxymethylcellulose aqueous solution obtained in step 1), and stir for 2 hours to obtain a mixed solution;

[0070] 3) Add barium sulfate particles to the mixed solution obtained in step 2), stir for 10 hours, vacuum defoam, adjust the viscosity ...

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Abstract

The invention relates to a binder for a lithium ion battery compound pole piece, a preparation method for the binder, a compound pole piece, a battery core, and a lithium ion battery and belongs to the technical field of lithium ion batteries. The binder for the lithium ion battery compound pole piece comprises the flowing components in parts by weight: 0.5-1.5 parts of an ethylene-vinyl acetate copolymer, 100-150 parts of barium sulfate particles, 1-1.5 parts of a thickener, and 98.5-99 parts of water. According to the invention, the surface of the pole piece is coated with a layer of the binder, a diaphragm is arranged on the surface of the binder on the pole piece, and then hot-pressing compounding is performed, so that the pole piece and the diaphragm are bound together, and the absolute positioning of the pole piece and the diaphragm is realized, a malposition phenomenon between the pole piece and the diaphragm in a following assembling process can be avoided, and the safety of the lithium ion battery can be improved.

Description

technical field [0001] The invention relates to a binder for a lithium-ion battery composite pole piece and a preparation method thereof, a composite pole piece, a battery cell and a lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have become the mainstream power batteries used in electric vehicles due to their high operating voltage, high energy density, long cycle life, and no memory effect. At present, my country's new energy automobile industry has ushered in a period of rapid growth, and the demand for lithium-ion power batteries has soared. However, at present, the output of lithium-ion power batteries of many enterprises cannot meet the rapidly growing demand of electric vehicles. The electrochemical performance and safety of lithium-ion batteries have a crucial impact, which leads to low production efficiency of large-capacity lithium-ion power batteries. [0003] Cell preparation i...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/139H01M10/0525
CPCH01M4/139H01M4/366H01M4/62H01M4/622H01M10/0525Y02E60/10
Inventor 许飞李小涛张向举
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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