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Lithium ion battery ceramic diaphragm coating composition

A technology of lithium-ion batteries and ceramic diaphragms, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of lithium-ion batteries that are difficult to meet, low thermal deformation temperature and melting temperature, and achieve excellent thermal shrinkage rate, low thermal Shrinkage, Effect of Low Ionic Permeability

Pending Publication Date: 2021-03-09
湖南高瑞电源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this type of material is that the electrolyte has good stability, but the heat distortion temperature and melting temperature are low, and it is difficult to meet the requirements of lithium-ion batteries, especially lithium-ion batteries used as power sources (such as lithium-ion batteries for electric vehicles)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0028] Add 10g of PVA4088 aqueous solution with a mass concentration of 10%, 3.27g of acrylic acid, 0.73g of acrylamide and 0.02g of ammonium persulfate-sodium sulfite composite initiator into the reaction vessel, add metered pure water to dilute, and stir until each component is completely dissolved . A measured amount of lithium hydroxide is added to make the pH of the reaction solution 6.8-7.2. Additional metered pure water is added until the mass concentration of the reaction solution is 19.5%-20.0%. Nitrogen gas was introduced into the reaction vessel, and the temperature in the reaction vessel was raised to 60° C., and after 12 hours of heat-retaining reaction, the materials were collected by cooling. The solid content of the product is 19.5%-20%.

preparation Embodiment 2

[0030] In this embodiment, PVA4088 is replaced by PVA2488, and the rest are the same as in Embodiment 1.

preparation Embodiment 3

[0032] In this embodiment, acrylic acid is replaced by methacrylic acid, and the rest are the same as in embodiment 1.

[0033] Specifically, in an embodiment of the present invention, in the (meth)acrylate-(meth)acrylamide copolymer grafted polyvinyl alcohol, the (meth)acrylate-(meth)acrylamide copolymer The mass fraction of the structure is 70%-95%, and the mass fraction of the polyvinyl alcohol structure is 5%-30%.

[0034] Specifically, in an embodiment of the present invention, the polymerized monomers of the (meth)acrylate-(meth)acrylamide copolymer include: acrylate, methacrylate, acrylamide, and methacrylamide.

[0035] Specifically, in an embodiment of the present invention, the polymerized monomer of the (meth)acrylate-(meth)acrylamide copolymer is at least one of the acrylate and the methacrylate, and at least one of said acrylamide and said methacrylamide.

[0036] Specifically, in an embodiment of the present invention, the amount of the acrylate and / or the meth...

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PUM

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Abstract

The invention discloses a lithium ion battery ceramic diaphragm coating composition which comprises the following components in percentage by mass: 94-97% of ceramic powder, 2.5%-5.5% of an adhesive,and 0.3%-0.5% of a dispersing agent. Compared with the prior art, the ceramic diaphragm coating composition has the advantages of being small in thickness, low in thermal shrinkage rate and good in air permeability, and the prepared corresponding ceramic diaphragm has excellent low thermal shrinkage rate and ion permeability.

Description

technical field [0001] The present application relates to the technical field of lithium-ion battery ceramic coatings, and more specifically, to a lithium-ion battery ceramic diaphragm coating composition, preparation method and application thereof. Background technique [0002] The separator is an important component in a lithium-ion battery, separating the positive and negative terminals of the battery to prevent short circuits. Usually, the material of the separator is polyethylene, polypropylene, or the like. The advantage of this type of material is that the electrolyte has good stability, but the heat distortion temperature and melting temperature are low, which makes it difficult to meet the requirements of lithium-ion batteries, especially lithium-ion batteries used as power sources (such as lithium-ion batteries for electric vehicles). At present, the main means of improving the heat resistance of the diaphragm is to coat one or both sides of the diaphragm with a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/434H01M50/446
CPCY02E60/10
Inventor 刘海明向金林席柳江黄玲
Owner 湖南高瑞电源材料有限公司
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