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Liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery diaphragm and preparation method thereof

A technology of ultra-high molecular weight and lithium battery diaphragm, which is applied to battery pack parts, circuits, electrical components, etc.

Active Publication Date: 2021-04-20
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of lithium ion battery safety, a liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery separator and its preparation method are provided

Method used

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  • Liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery diaphragm and preparation method thereof
  • Liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery diaphragm and preparation method thereof
  • Liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery diaphragm, which weighs the following components in weight percentage: ultra-high molecular weight polyethylene 75wt%, ultra-high molecular weight polyethylene graft material 5wt%, liquid crystal polymer 20wt%;

[0035] Wherein, the average molecular weight of the ultra-high molecular weight polyethylene is greater than 2 million;

[0036] Wherein, the ultra-high molecular weight polyethylene grafting material contains glycidyl methacrylate (GMA) functional group on the molecular chain, and the specific preparation method is as follows step (2);

[0037] Wherein, the melting point of the liquid crystal polymer is 185°C to 205°C, and the structure of the liquid crystal polymer is:

[0038]

[0039] Among them, Y, Z, and 1-Y-Z represent the overall composition rather than the chain length, and the content of Y and Z is related to the number of moles of raw materials added.

[0040] Pr...

Embodiment 2

[0047] A liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery diaphragm, which weighs the following components in weight percentage: ultra-high molecular weight polyethylene 70wt%, ultra-high molecular weight polyethylene graft material 10wt%; liquid crystal polymer 20wt%.

[0048] In this example, a liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery separator was prepared according to the same technical method as in Example 1.

Embodiment 3

[0050] A liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery diaphragm, which weighs the following components in weight percent: ultra-high molecular weight polyethylene 65 wt%, ultra-high molecular weight polyethylene graft material 15 wt%; liquid crystal polymer 20 wt%.

[0051] In this example, a liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery separator was prepared according to the same technical method as in Example 1.

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Abstract

The invention relates to a liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery diaphragm and a preparation method thereof. The liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery diaphragm comprises, by weight, 45-75wt% of ultrahigh molecular weight polyethylene, 5-15wt% of an ultrahigh molecular weight polyethylene grafting material, and 20-40 wt% of a liquid crystal polymer. The ultrahigh molecular weight polyethylene is used as a base material of the diaphragm, the liquid crystal polymer is used as a framework material, the ultrahigh molecular weight polyethylene grafting is used as a compatilizer, the liquid crystal polymer with high orientation is uniformly dispersed in the diaphragm through a blending extrusion process, and through longitudinal and transverse high-magnification stretching, the liquid crystal macromolecules are staggered in the longitudinal direction and the transverse direction to form a highly-oriented net-shaped structure. Due to the fact that the liquid crystal macromolecules have the characteristics of high strength, high heat resistance and high flame retardance, the performance of the diaphragm can be comprehensively improved, and the purpose of improving the safety coefficient of the lithium battery is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium battery separators, in particular to a liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery separator and a preparation method thereof. Background technique [0002] As a new generation of energy storage technology, lithium-ion batteries have been widely researched and applied, but they can only work at room temperature. High temperature or low temperature will cause the performance of lithium battery to decrease, and the life and capacity will be compromised. Especially under high temperature conditions, large heat fluctuations will be generated inside the battery, which will cause safety accidents such as explosions. [0003] For power lithium battery packs, generally the best operating temperature is 30-60°C, beyond this range the performance and safety of the battery will be affected. In the high temperature test of lithium batteries, there are extreme temperatu...

Claims

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Application Information

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IPC IPC(8): H01M50/417H01M50/414H01M50/411H01M50/403
CPCY02E60/10
Inventor 巢雷李正林翁星星陈朝晖贡晶晶
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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