Binder for lithium ion battery separator coating and preparation method of binder

A lithium-ion battery and binder technology, applied in the direction of adhesive types, battery pack parts, nitrile copolymer adhesives, etc., can solve the problems of poor heat resistance and high moisture content of coatings, and improve the heat Performance, conduction performance improvement, effect of reducing moisture content

Active Publication Date: 2018-12-07
珠海辰玉新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned shortcoming of prior art, the present invention provides a kind of binder and preparation method for lithium-ion battery diaphragm coati

Method used

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  • Binder for lithium ion battery separator coating and preparation method of binder
  • Binder for lithium ion battery separator coating and preparation method of binder
  • Binder for lithium ion battery separator coating and preparation method of binder

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0032] Example 1

[0033] The binder for lithium ion battery separator coating of this embodiment contains the following raw materials in weight percentage: acrylonitrile 33%, acrylic acid 30%, butyl acrylate 3%, ammonium persulfate 1.5%, lithium hydroxide 1.5%, ten Sodium dialkylbenzene sulfonate 2%, p-nonylphenol polyoxyethylene ether 1%, water 51%; the above raw materials are analytically pure and above purity.

[0034] Preparation:

[0035] Add 20% ultrapure water to the buffer tank, then add the initiator, stir evenly to prepare the initiator aqueous solution;

[0036] Add all the monomers, emulsifiers and the remaining 80% ultrapure water into the emulsification tank, stir at high speed for emulsification, and obtain a pre-emulsion;

[0037] Add 30% of the pre-emulsion to the reaction kettle, stir and raise the temperature, control the temperature at 75°C, add a 30% aqueous solution of initiator and lithium hydroxide, and react for 2 hours;

[0038] Then slowly add the remaining p...

Example Embodiment

[0039] Example 2

[0040] The binder for lithium ion battery separator coating of this embodiment contains the following raw materials in weight percentage: acrylonitrile 26%, acrylic acid 25%, acrylic acid 2-ethylhexyl ester 3%, ammonium persulfate 1.5%, hydroxide 0.5% lithium, 2% sodium dodecylbenzene sulfonate, 1% p-nonylphenol polyoxyethylene ether, 51% water; the above raw materials are analytically pure and above purity.

[0041] Preparation:

[0042] Add 20% ultrapure water to the buffer tank, then add the initiator, stir evenly to prepare the initiator aqueous solution;

[0043] Add all the monomers, emulsifiers and the remaining 80% ultrapure water in the emulsification tank, stir at high speed for emulsification, and obtain a pre-emulsion;

[0044] Add 30% pre-emulsion to the reaction kettle, stir and increase the temperature, control the temperature at 75°C, add 30% initiator and lithium carbonate aqueous solution, and react for 2h;

[0045] Then slowly add the remaining pre-...

Example Embodiment

[0046] Example 3

[0047] The binder for lithium ion battery separator coating of this embodiment contains the following raw materials in weight percentage: 18% acrylonitrile, 22% acrylic acid, 6% isooctyl acrylate, 1.5% ammonium persulfate, 3.5% lithium hydroxide, Sodium dodecylbenzene sulfonate 2%, p-nonylphenol polyoxyethylene ether 1%, water 51%; the above raw materials are analytical grade and above purity.

[0048] Preparation:

[0049] Add 20% ultrapure water to the buffer tank, then add the initiator, stir evenly to prepare the initiator aqueous solution;

[0050] Add all the monomers, emulsifiers and the remaining 80% ultrapure water into the emulsification tank, stir at high speed for emulsification, and obtain a pre-emulsion;

[0051] Add 30% pre-emulsion to the reaction kettle, stir and raise the temperature, control the temperature at 75°C, add 30% initiator and lithium sulfide aqueous solution, and react for 2h;

[0052] Then slowly add the remaining pre-emulsion and the r...

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Abstract

The invention provides a binder for a lithium ion battery separator coating and a preparation method of the binder. The binder for the lithium ion battery separator coating mainly comprises the following components of: in parts by weight, 6-33 parts of acrylonitrile, 16-30 parts of acrylic acid, 1-5 parts of softer monomer, 0.1-5 parts of an emulsifier, 0.1-2 parts of an initiator, 0.1-5 parts oflithium salts and 30-70 parts of ultrapure water, and the preparation method of the binder comprises the steps of: adding the ultrapure water and the emulsifier to an emulsifying tank, performing evenstirring, adding all the monomer, and performing stirring so as to obtain a pre-emulsion; adding the remaining ultrapure water and the pre-emulsion in a reaction kettle, performing stirring and heating to 60-100 DEG C, adding an aqueous solution of the initiator dropwise, carrying out a reaction, keeping the temperature for 4-8 hours, performing cooling to room temperature, and regulating the pHvalue. Through the binder, the problems of no resistance to high temperature and excessively high moisture content of the lithium ion battery separator coating are solved, the conductivity of ions isimproved, and the safety performance of batteries is improved.

Description

technical field [0001] The invention relates to the field of lithium battery preparation, in particular to a binder for lithium ion battery separator coating and a preparation method. Background technique [0002] At present, the lithium-ion battery separators used commercially are generally polyethylene or polypropylene separators, which have better acid and alkali resistance, higher tensile strength, higher porosity and other properties. However, the current diaphragm shrinks greatly when it is above 150°C, which may cause direct contact between the positive and negative electrodes of the battery, an internal short circuit occurs, the battery catches fire and explodes, and there is a great safety hazard to the safety performance of the battery. In order to improve the heat resistance of the diaphragm at high temperature Performance, coating one or both sides of the separator with a ceramic heat-resistant coating can effectively reduce the thermal shrinkage of the separator...

Claims

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Application Information

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IPC IPC(8): C09J133/20C09J133/02C08F220/46C08F220/06C08F220/18H01M2/16
CPCC09J133/02C09J133/20C08F220/06C08F220/46H01M50/411C08F220/1808C08F220/1804Y02E60/10
Inventor 王燕王世伟王世光
Owner 珠海辰玉新材料科技有限公司
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