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A kind of silica airgel modified lithium-ion battery diaphragm and preparation method

A lithium-ion battery, silicon aerogel technology, applied in secondary batteries, battery pack parts, separators/films/diaphragms/spacers and other directions, can solve the problem of easy shedding of silica aerogels, Achieve the effect of high heat resistance, good heat resistance and high porosity

Active Publication Date: 2021-11-12
深圳市元鼎智能创新有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the first method has the problem that the silica airgel is easy to fall off, and the second method needs to improve the compatibility of the silica airgel and the diaphragm substrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare raw materials according to the formula: 100 parts of polypropylene, 10 parts of ultra-high molecular weight polypropylene, 1 part of anti-aging agent, 1 part of lubricant, 0.5 parts of beta nucleating agent and 1 part of cage-type silsesquioxane hybrid silica airgel.

[0026] Take 50 parts of polypropylene, ultra-high molecular weight polypropylene and cage-type silsesquioxane hybrid silica airgel, mix them, and use a granulator to granulate to obtain master batch 1; mix master batch 1 and the remaining 50 parts Mix polypropylene, anti-aging agent, lubricant and β-nucleating agent evenly, melt and plasticize at 180-210℃ in extruder, cast film, heat treatment at 130℃, stretch axially at 2.3 times in longitudinal direction, and 3.5 times in transverse direction Axially stretched to obtain a lithium-ion battery separator 1 .

Embodiment 2

[0028] Prepare raw materials according to the formula: 100 parts polypropylene, 20 parts ultra-high molecular weight polypropylene, 1 part anti-aging agent, 2 parts lubricant, 1.5 parts beta nucleating agent and 3 parts cage-type silsesquioxane hybrid silica airgel.

[0029] Take 50 parts of polypropylene, ultra-high molecular weight polypropylene and cage-type silsesquioxane hybrid silica airgel, mix them, and use a granulator to granulate to obtain master batch 2; mix master batch 2 and the remaining 50 parts Mix polypropylene, anti-aging agent, lubricant and β-nucleating agent evenly, melt and plasticize at 180-210°C in the extruder, cast to form a film, heat-treat at 130°C, stretch axially at a rate of 2.2 in the longitudinal direction, and stretch at a rate of 3.7 in the transverse direction Axially stretched to obtain a lithium-ion battery separator 2.

Embodiment 3

[0031] Prepare raw materials according to the formula: 100 parts of polypropylene, 35 parts of ultra-high molecular weight polypropylene, 1 part of anti-aging agent, 1.5 parts of lubricant, 1 part of anti-blocking agent, 2.5 parts of beta nucleating agent and 6 parts of cage silsesquioxane Hybrid silica airgel.

[0032] Take 50 parts of polypropylene, ultra-high molecular weight polypropylene and cage-type silsesquioxane hybrid silica airgel, mix them, and use a granulator to granulate to obtain master batch 3; mix master batch 3 and the remaining 50 parts Parts of polypropylene, anti-aging agent, lubricant, blocking agent and β-nucleating agent are mixed uniformly, melted and plasticized by extruder at 180-210°C, cast into film, heat-treated at 140°C, axially stretched at a ratio of 2.1 in the longitudinal direction, Axial stretching at a rate of 3.2 in the transverse direction was obtained to obtain a lithium-ion battery separator 3 .

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Abstract

The invention belongs to the field of lithium ion batteries, relates to the technical field of lithium ion diaphragms, and specifically relates to a silica airgel modified lithium ion battery diaphragm and a preparation method thereof. The diaphragm consists of the following components in parts by weight, 100 parts poly Propylene, 10-50 parts of ultra-high molecular weight polypropylene, 1-5 parts of additives, 0.1-5 parts of nucleating agent and 1-10 parts of cage-type silsesquioxane hybrid silica airgel. The silica airgel modified lithium-ion battery diaphragm of the invention has good heat resistance, high porosity and good air permeability, and can be applied to power lithium-ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a silicon airgel modified lithium ion battery diaphragm and a preparation method. Background technique [0002] Separator is one of the key components of lithium batteries and has an important impact on the performance of lithium batteries. Improving the heat resistance, mechanical strength, and liquid absorption of the separator is of great significance for improving the performance of lithium batteries. [0003] Silica airgel has the characteristics of low density, high porosity, large specific surface area, poor thermal conductivity, etc., and many applications have been published in separators. There are two main application methods: one is to coat the silica airgel on the surface of the diaphragm, such as CN109449355A, and the other is to disperse the silica airgel inside the diaphragm, such as CN108400273A. However, the first method has the problem that the silica airge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M50/446H01M50/409C08J5/18C08L23/12C08L83/04C08K7/26
CPCC08J5/18C08J2323/12C08J2423/12C08J2483/04C08K7/26H01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 曹亚琼
Owner 深圳市元鼎智能创新有限公司