Adhesive for lithium ion battery ceramic diaphragm and preparation method of adhesive

A technology for lithium ion batteries and ceramic separators, applied in the direction of adhesive types, ester copolymer adhesives, etc., can solve the problem of affecting the flatness and dimensional stability of ceramic separators, affecting the leveling performance of adhesives, and poor environmental friendliness and other problems, to achieve excellent bonding strength, reduce VOC emissions, and environmental friendly effects

Active Publication Date: 2016-07-20
BLUE OCEAN & BLACK STONE TECH CO LTD FUJIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the viscosity of the adhesive is greater than 2000 centipoise, and the coating viscosity is high, which may affect the leveling performance of the adhesive, which may affect the smoothness and dimensional stability of the ceramic diaphragm; Environmental friendliness is poor, and long-term exposure is not conducive to health

Method used

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  • Adhesive for lithium ion battery ceramic diaphragm and preparation method of adhesive
  • Adhesive for lithium ion battery ceramic diaphragm and preparation method of adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this example, SDS and sorbitan fatty acid ester compound are used as the emulsifier for the adhesive for the ceramic diaphragm, ammonium persulfate and diabolite are used as the initiator, and methacrylic acid is used as the acrylic hard monomer for polymerization. Methyl ester and acrylonitrile, acrylic soft monomers for polymerization adopt isooctyl acrylate, wherein the ratio of methyl methacrylate, acrylonitrile and isooctyl acrylate is 5:3:2 by weight.

[0044] The preparation method of the above-mentioned adhesive for ceramic diaphragm is as follows: add 10 parts of SDS, 50 parts of sorbitan fatty acid ester and 300 parts of water in a pre-emulsification bottle and mix thoroughly, and then add 375 parts of methyl methacrylate in sequence , 225 parts of acrylonitrile and 150 parts of isooctyl acrylate were stirred at a high speed at a speed of 600 rpm to disperse and form a stable pre-emulsion;

[0045] After 30 minutes, take out 100g of the pre-emulsion and add...

Embodiment 2

[0048] In this example, sodium dodecylbenzenesulfonate and sorbitan fatty acid ester are compounded as the emulsifier for the adhesive for the ceramic diaphragm, and methyl methacrylate, acrylonitrile, and isooctyl acrylate are used for polymerization. The ratio of those is 5:1:4 by weight, and all the other steps are with embodiment 1.

[0049] The prepared adhesive has a solid content of 40%, is milky white, has a particle size range of 100nm-300nm, and has a viscosity of less than 10 centipoise.

Embodiment 3

[0051] In this example, SDS and polyoxyethylene sorbitan fatty acid ester are used as the emulsifier for the adhesive for the ceramic diaphragm, methyl methacrylate and acrylonitrile are used for polymerization, and acrylic acid is used for polymerization. The soft monomer adopts isobutyl acrylate, wherein the ratio of methyl methacrylate, acrylonitrile and isobutyl acrylate is 5:2:3 by weight.

[0052] The prepared adhesive has a solid content of 45%, is milky white, has a particle size range of 100nm-300nm, and has a viscosity of 40 centipoise.

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Abstract

The invention relates to an adhesive for a lithium ion battery ceramic diaphragm and a preparation method of the adhesive. The preparation method includes: adopting a method of emulsion polymerization; mixing acrylic acid type soft monomer and hard monomer in a specific proportion through dispersing effect of a compound emulsifier to form stable latex bundle; under action of an initiator, enabling polymerization monomer to be polymerized in the latex bundle to form a stable polymer emulsion. Through formed copolymer, the adhesive has high wettability and initial adhesion, and certain hardness and tensile strength are maintained, so that the adhesive has excellent binding strength, low coating viscosity and high mechanical strength. In addition, the adhesive emulsion has excellent performance in dispersing ceramic particles, the preparation method is simple and environment-friendly, and requirements on heat resistance of a base material are lowered greatly.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to an adhesive for lithium-ion battery ceramic separators and a preparation method thereof. Background technique [0002] Due to the advantages of high voltage, large specific energy, wide working range, large specific power, stable discharge, and long storage time, lithium-ion batteries are currently widely used in many fields such as mobile phones, computers, energy storage equipment, and electric vehicles. With the continuous increase of battery capacity and voltage, its safety risk is also gradually increasing. The separator can affect the battery's interface structure, internal resistance, battery capacity, cycle times and safety performance. Its heat resistance and stability play an important role in the safety of the battery. critical use. [0003] Since the traditional polyethylene (PE) separator and polypropylene (PP) separator have relatively low melting points, 125°C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/12C08F220/14C08F220/44C08F220/18
CPCC09J133/12C08F220/14C08F220/44C08F220/1808C08F220/1804
Inventor 白丰瑞李强罗贺斌
Owner BLUE OCEAN & BLACK STONE TECH CO LTD FUJIAN
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