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A kind of ceramic slurry and lithium-ion battery diaphragm

A technology of ceramic slurry and ceramic diaphragm, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as thermal runaway of lithium-ion batteries, achieve the effects of reducing content, increasing stability, and enhancing stability

Active Publication Date: 2021-01-08
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The binder used in the current ceramic slurry contains a large number of polar functional groups. The type or content of these polar functional groups is too large, which is easy to trigger thermochemical reactions and cause thermal runaway of lithium-ion batteries.

Method used

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  • A kind of ceramic slurry and lithium-ion battery diaphragm
  • A kind of ceramic slurry and lithium-ion battery diaphragm
  • A kind of ceramic slurry and lithium-ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of ceramic slurry is divided into two steps:

[0035] (1) Preparation of ceramic dispersion: Add 100 kg of deionized water to the kettle rinsed with deionized water, then add 0.5 kg of polyacrylic dispersant (Nippon Shokubai Aqualic GL366) and 10 kg of thickener CMC (Japan DaicelChemical company DAICEL1220), open the stirring paddle to stir the added liquid evenly; add 100 kg of nano-alumina (Lianlian Chemical, specific surface area: 7m 2 / g), stirred for 1 hour to make it fully dispersed. The particle size is 0.4-1.3 μm.

[0036] (2) Preparation of ceramic slurry: the dispersion obtained in the above steps is sand-milled by a sand mill for 2 to 3 times, and the particle size distribution of the dispersion is detected to meet the standard; the sand-milled dispersion is placed in the In another kettle rinsed with deionized water, calculate the yield after sanding, and add 10kg of thickener, 2kg of binder (water-based polyacrylate emulsion, Zeon Corporat...

Embodiment 2

[0041] (1) Preparation of ceramic dispersion: add 100kg of deionized water to the kettle rinsed with deionized water, then add 5kg of sodium polypropylene sulfonate dispersant (Dongguan Sinuobao S570) and 30kg of thickener, and start Stirring paddle to stir the added liquid evenly; add 100kg boehmite (Shandong Jingxin, specific surface area 12m 2 / g), stirred for 1 hour to make it fully dispersed. The particle size is 0.2-1.7 μm.

[0042] (2) Preparation of ceramic slurry: the dispersion obtained in the above steps is sand-milled by a sand mill for 2 to 3 times, and the particle size distribution of the dispersion is detected to meet the standard; the sand-milled dispersion is placed in the In another kettle rinsed with deionized water, the productive rate after sand milling was calculated, and 10kg of thickener, 20kg of polyvinyl alcohol binder (Shenyang Yuanwang Chemical Industry LORD606), 5kg of water-based polyamide were added respectively according to the productive rate...

Embodiment 3

[0047] (1) Preparation of ceramic dispersion: add 100kg of deionized water to the kettle washed with deionized water, then add 2.5kg of polyacrylic acid sodium salt dispersant (Shanghai Qihe 3000A55) and 20kg of thickener, and turn on the stirring paddle. Stir the added liquid evenly; add 100kg of silicon dioxide (Shanghai Yinhuang Industry, specific surface area 10m 2 / g), stirred for 1 hour to make it fully dispersed. The particle size is 0.5-1.8 μm.

[0048](2) Preparation of ceramic slurry: the dispersion obtained in the above steps is sand-milled by a sand mill for 2 to 3 times, and the particle size distribution of the dispersion is detected to meet the standard; the sand-milled dispersion is placed in the In another kettle rinsed with deionized water, calculate the yield after sanding, and add 5kg of thickener, 10kg of polyacrylate and polyvinyl alcohol common binder (Dongguan Xinda AD-801) according to the yield , 2.5kg water-based polyimide (Huizhi Technology PIW se...

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Abstract

The invention relates to a ceramic slurry and a lithium-ion battery diaphragm. The ceramic slurry includes the following mass components: 100 parts of ceramic powder, 2-20 parts of binder, 10-40 parts of thickener, poly 0.5-5 parts of olefin adhesive aid, 0.5-5 parts of dispersant, 5-30 parts of surfactant. In the ceramic slurry provided by the present invention, water-based polyimide is added to the ceramic slurry to reduce the content of the binder, and the thermal decomposition temperature of the water-based polyimide is high, which effectively reduces the amount of easily decomposed functional groups in the binder. The content increases the stability of the ceramic coating, thereby improving the thermal stability of the ceramic separator, and effectively improving the safety of the lithium-ion battery prepared therefrom.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a ceramic slurry and a lithium ion battery diaphragm prepared therefrom. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high specific power, good cycle performance, no memory effect, and no pollution. They have good economic benefits, social benefits, and strategic significance. They have become the most eye-catching green chemical power sources. In recent years, with the promotion of new energy vehicles at home and abroad, lithium-ion batteries have become the first choice for electric vehicle power sources due to their unique advantages. With the development of lithium batteries, especially power lithium-ion batteries, the energy density and capacity requirements are getting higher and higher, and at the same time, higher requirements are put forward for the thermal stability of lithium-ion battery separators. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/434H01M50/446H01M50/451H01M10/0525H01M50/449
CPCH01M10/0525H01M50/446H01M50/449Y02E60/10
Inventor 赵言李小磊李茜茜陈路周旭苗玉恒王莉千昌富柳青
Owner 乐凯胶片股份有限公司