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Environment-friendly high-performance ceramic coating lithium ion battery diaphragm and preparation method thereof

A lithium battery diaphragm and ceramic coating technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of weak interface bonding and easy peeling off of the coating, and achieve high capacity and fast charging and discharging functions, which are not easy to Shedding, good use of the effect of safety performance

Active Publication Date: 2015-05-20
SINOMA LITHIUM BATTERY SEPARATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome defects such as easy peeling, delamination, and weak interface bonding of the lithium-ion battery separator ceramic coating in the prior art, the present invention provides a green high-performance ceramic-coated lithium-ion battery separator and a preparation method thereof

Method used

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  • Environment-friendly high-performance ceramic coating lithium ion battery diaphragm and preparation method thereof
  • Environment-friendly high-performance ceramic coating lithium ion battery diaphragm and preparation method thereof
  • Environment-friendly high-performance ceramic coating lithium ion battery diaphragm and preparation method thereof

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Effect test

Embodiment 1

[0045] The green high-performance ceramic-coated lithium battery separator includes a polyolefin-based microporous membrane and a ceramic coating compounded on the upper surface of the polyolefin-based microporous membrane; the total thickness of the green high-performance ceramic-coated lithium battery separator is 11 μm; the ceramic coating The thickness of the layer is 2 μm; the porosity of the polyolefin matrix microporous membrane is 42%, the pore diameter is 0.48 μm, and the axial section of the pores on the polyolefin matrix microporous membrane is wavy.

[0046] The specific preparation of the green high-performance ceramic-coated lithium battery separator is as follows:

[0047] (1) Weigh 9g of Shanghai Youdao Auba Chemical Co., Ltd., the model is American Dow POLYOX WSR301 polyethylene oxide, add it to 100mL deionized water at 65°C, stir for 20 minutes to obtain a homogeneous solution, and then cool to room temperature; ( 2) Then take 0.5g of ethyl acrylate of Shangh...

Embodiment 2

[0049] The green high-performance ceramic-coated lithium battery separator includes a polyolefin-based microporous membrane and a ceramic coating compounded on the upper surface of the polyolefin-based microporous membrane; the total thickness of the green high-performance ceramic-coated lithium battery separator is 151 μm; the ceramic coating The thickness of the layer is 3 μm; the porosity of the polyolefin matrix microporous membrane is 45%, the pore diameter is 0.455 μm, and the axial section of the pores on the polyolefin matrix microporous membrane is wavy.

[0050] The specific preparation of the green high-performance ceramic-coated lithium battery separator is as follows:

[0051] (1) Weigh 10g of polyvinyl alcohol (average molecular weight 22,000) produced in Japan by Jinan Yida Chemical Trading Co., Ltd., add it to 100mL deionized water at 80°C, stir for 30 minutes to obtain a homogeneous solution, and then cool to room temperature; ( 2) Next, take 1g of methyl acry...

Embodiment 3

[0053] The green high-performance ceramic-coated lithium battery separator includes a polyolefin-based microporous membrane and a ceramic coating compounded on the upper surface of the polyolefin-based microporous membrane; the total thickness of the green high-performance ceramic-coated lithium battery separator is 18 μm; the ceramic coating The thickness of the layer is 2 μm; the porosity of the polyolefin matrix microporous membrane is 48%, the pore diameter is 0.40 μm, and the axial section of the pores on the polyolefin matrix microporous membrane is wavy.

[0054] The specific preparation of the green high-performance ceramic-coated lithium battery separator is as follows:

[0055] (1) Weigh 12g of Hangzhou Zhuoli Chemical Co., Ltd. model 515# melamine formaldehyde resin into 100mL deionized water at 90°C, stir for 30 minutes to obtain a homogeneous solution, and then cool to room temperature; (2) Then take 1.5g Shandong Add methyl acrylate with CAS No. 96-33-3 from Cent...

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Abstract

The invention discloses an environment-friendly high-performance ceramic coating lithium ion battery diaphragm and a preparation method thereof. The environment-friendly high-performance ceramic coating lithium battery diaphragm comprises a polyolefin matrix microporous membrane and a ceramic coating which is composited on the upper surface or on the upper surface and the lower surface of the polyolefin matrix microporous membrane; the overall thickness of the environment-friendly high-performance ceramic coating lithium battery diaphragm is 8 to 40 micrometers; the thickness of the ceramic coating is 2 to 5 micrometers; the porosity of the polyolefin matrix microporous membrane is 42 to 52 percent, the aperture of the polyolefin matrix microporous membrane is 0.15 to 1.5 micrometers, and the axial cross section of each hole in the polyolefin matrix microporous membrane is in a wavy shape. A lithium ion battery prepared by adopting the environment-friendly high-performance ceramic coating lithium ion battery diaphragm is relatively good in safety, and the problems of dropping and no temperature resistance of an existing lithium battery diaphragm ceramic coating and the safety problem caused by the diaphragm of a lithium ion battery can be effectively solved; the lithium ion battery diaphragm provided by the invention is high in porosity and good in electrolyte wetting property, mechanical property and temperature resistance and also has high-temperature turn-off performance.

Description

technical field [0001] The invention relates to a green high-performance ceramic coating lithium-ion battery diaphragm and a preparation method thereof, belonging to the field of lithium battery diaphragms. Background technique [0002] At present, the separators that fill the entire lithium battery manufacturing industry are still made of polyolefin. Whether it is dry or wet, uniaxial or biaxial, it is difficult to change its poor temperature resistance. This not only brings hidden dangers to the safety performance of consumer batteries, but also limits its application in power lithium batteries. For this reason, the technology of coating temperature-resistant materials on the polyolefin matrix diaphragm has emerged. Although there are PVDF coatings, most of them are coated with ceramic layers. There are three main types of ceramic coating formulations: high-temperature binder type, sol-gel type and water-soluble type. The former two use more toxic solvents, which not onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/449H01M50/451H01M50/457H01M50/463H01M50/489H01M50/491
CPCH01M50/431H01M50/403Y02E60/10
Inventor 白耀宗宋尚军邓重义琚晓晖王学瑞赵东波黄箭玲董浩宇李登科刘杲珺杜敬然曲丽敏尹康
Owner SINOMA LITHIUM BATTERY SEPARATOR CO LTD
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