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Process for preparing water adhesive of lithium ion battery

A technology for water-based adhesives and lithium-ion batteries, which can be used in adhesive types, amide/imide polymer adhesives, secondary battery parts, etc., and can solve problems such as pollution

Inactive Publication Date: 2005-07-06
成都茵地乐电源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to; use comonomer to synthesize the water-based binder that has good adhesion to lithium ion battery electrode material and current collector with soap-free emulsion polymerization technology; Solvent-based adhesives such as polyvinylidene fluoride to solve the pollution of organic solvents to the environment and protect the health of production personnel

Method used

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  • Process for preparing water adhesive of lithium ion battery
  • Process for preparing water adhesive of lithium ion battery
  • Process for preparing water adhesive of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the present embodiment, the water-based adhesive used for lithium-ion secondary battery carbon negative electrode sheet prepared by copolymerization in the water phase with hydrophilic monomer acrylamide (AM) and lipophilic monomer vinyl acetate (VAc), The copolymer composition is AM:VAc=6:4 (weight ratio, the same below), the copolymer content is 10%, and the product is in the state of translucent microemulsion.

[0020] The method for making the above-mentioned water-based adhesive for lithium-ion secondary batteries is: add 18 parts of acrylamide and 270 parts of distilled water in the reaction vessel, stir to dissolve, and the rotating speed is 100 rpm; add 12 parts of vinyl acetate, pass into Oxygen was driven by nitrogen for 1 hour; heated and kept at 50°C; then 0.4 parts of ammonium persulfate and 0.2 parts of sodium sulfite were added to initiate the reaction, which ended after 8 hours. A water-based binder for the lithium-ion battery carbon negative electrod...

Embodiment 2

[0022] The preparation method and operating conditions of the adhesive in this example are basically the same as in Example 1, except that a hydrophilic monomer lithium acrylate (LiA) is added, and 12 parts of acrylamide and 6 parts of lithium acrylate are dissolved in 270 parts of distilled water; add 12 parts of vinyl acetate, and react at 40°C for 12 hours; the copolymer composition of the adhesive is LiA:AM:VAc=2:4:4, the copolymer content is 10%, and the adhesive product is white milky.

Embodiment 3

[0024] The preparation method of the adhesive in this example is the same as in Example 2, except that the lipophilic monomer is ethyl acrylate (EA) and reacted at a temperature of 50° C. for 5 hours; the copolymer composition is LiA:AM:EA=2:4 : 4, the solid content of the copolymer is 10%, and the adhesive is in the form of emulsion.

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Abstract

A water adhesive for li-ion battery features that the molecular chain of its copolymer has both hydrophilic and lipophilic structure units in Wt ratio of 5-90 to 10-95 and is prepared by copolymerizing the monomers correspondent to said structure units. The resultant amphiphilic copolymer can be dispersed in water medium and has better adhesion to the electrode material of Li-ion battery. Its advantages are no environmental pollution, high initial charge efficiency of 97-99.5% for positive and 88-93% for negative, and high capacity over 80% after 500 charge-discharge cycles.

Description

technical field [0001] The present invention relates to lithium ion secondary battery electrode material binder and manufacturing method thereof, more specifically, relate to be used for lithium ion secondary battery electrode active material, comprise cobalt, nickel, manganese positive electrode and various carbon negative electrode materials The water-based adhesive of the invention also relates to a manufacturing method thereof and a lithium-ion battery using the adhesive. Background technique [0002] Lithium-ion battery is a new type of rechargeable ideal high-energy battery that has only been developed and developed in the past ten years. It is widely used in electric vehicles, aerospace, and portable appliances such as mobile phones, laptop computers, video cameras, cameras, and word processors. etc.; the battery is mainly composed of positive electrode, negative electrode, diaphragm and non-aqueous electrolyte; , conductive agent and current collector composition. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/26H01M10/02
CPCY02E60/10
Inventor 张晓正邓正华万国祥郑维忠
Owner 成都茵地乐电源科技有限公司