A kind of binder for lithium ion battery separator coating and preparation method

A lithium-ion battery and binder technology, applied in the direction of adhesive types, battery pack components, nitrile copolymer adhesives, etc., can solve the problems of high moisture content and poor heat resistance of the coating, and achieve conduction The effect of improving performance, improving heat resistance and good industrialization prospects

A lithium-ion battery and binder technology, applied in the direction of adhesive types, battery pack components, nitrile copolymer adhesives, etc., can solve the problems of high moisture content and poor heat resistance of the coating, and achieve conduction The effect of improving performance, improving heat resistance and good industrialization prospects

CN108949074BActive Publication Date: 2020-10-02珠海辰玉新材料科技有限公司
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  • A kind of binder for lithium ion battery separator coating and preparation method
  • A kind of binder for lithium ion battery separator coating and preparation method
  • A kind of binder for lithium ion battery separator coating and preparation method

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Experimental program
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Effect test

Embodiment 1

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

[0034] Preparation:

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

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

[0038] Slowly add the remaining p...

Embodiment 2

[0040] The binder for the lithium-ion battery separator coating of the present embodiment comprises the following raw materials in weight percentage: 26% of acrylonitrile, 25% of acrylic acid, 3% of 2-ethylhexyl acrylate, 1.5% of ammonium persulfate, and Lithium 0.5%, sodium dodecylbenzene sulfonate 2%, p-nonylphenol polyoxyethylene ether 1%, water 51%; the above raw materials are of analytical grade and above.

[0041] Preparation:

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

[0043] 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;

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

[0045] Slowly add the remaining pre...

Embodiment 3

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

[0048] Preparation:

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

[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 2 hours;

[0052] Slowly add the remaining pre-em...

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Abstract

The invention provides a binder for a lithium-ion battery separator coating and a preparation method thereof. The binder for a lithium-ion battery separator coating mainly includes the following components in parts by weight: 6-33 parts of acrylonitrile 16-30 parts of acrylic acid; 1-5 parts of soft monomer; 0.1-5 parts of emulsifier, 0.1-2 parts of initiator, 0.1-5 parts of lithium salt, 30-70 parts of ultrapure water; its preparation method is in emulsification Add ultrapure water and emulsifier into the tank, stir evenly, add all the monomers, and get a pre-emulsion after stirring; add the remaining ultrapure water and pre-emulsion into the reaction kettle, stir and heat up to 60-100°C, add dropwise Initiator aqueous solution, react, keep constant temperature for 4-8h, cool to normal temperature, adjust pH value. The application solves the problem that the diaphragm coating of the lithium-ion battery is not resistant to high temperature and the water content is too high, improves the conductivity of ions, and improves the safety performance of the battery.

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

Patent Timeline
02 Oct 2020
Publication
CN108949074B
IPC
C09J133/20; C09J133/02; C08F220/46; C08F220/06; C08F220/18; H01M2/16
CPC
C09J133/02; C09J133/20; C08F220/06; C08F220/46; H01M50/411; C08F220/1808; C08F220/1804; Y02E60/10
Inventors
王燕; 王世伟