A liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery separator and preparation method thereof

An ultra-high molecular weight, liquid crystal polymer technology, applied in the field of liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery separator and its preparation

Active Publication Date: 2022-08-05
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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  • A liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery separator and preparation method thereof
  • A liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery separator and preparation method thereof
  • A liquid crystal reinforced ultra-high molecular weight polyethylene lithium battery separator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A liquid crystal-enhanced ultra-high molecular weight polyethylene lithium battery separator, which weighs the following components by weight: 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 graft material contains glycidyl methacrylate (GMA) functional group on the molecular chain, and the specific preparation method is as follows (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, 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] The liquid crystal-enhanced...

Embodiment 2

[0047] A liquid crystal-enhanced ultra-high molecular weight polyethylene lithium battery separator, which weighs the following components by weight: ultra-high molecular weight polyethylene 70wt%, ultra-high molecular weight polyethylene graft material 10wt%, and liquid crystal polymer 20wt%.

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

Embodiment 3

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

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

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Abstract

The invention relates to a liquid crystal-enhanced ultra-high molecular weight polyethylene lithium battery separator and a preparation method thereof, comprising the following components by weight: ultra-high molecular weight polyethylene 45-75 wt %, ultra-high molecular weight polyethylene graft material 5-15 wt % ; Liquid crystal polymer 20 ~ 40wt%. Using ultra-high molecular weight polyethylene as the matrix material of the separator, liquid crystal polymer as the skeleton material, and ultra-high molecular weight polyethylene graft as the compatibilizer, the highly oriented liquid crystal polymer is uniformly dispersed in the separator through the blending extrusion process. During the high-rate stretching in the vertical and horizontal directions, the liquid crystal polymer is staggered in the vertical and horizontal directions to form a highly oriented network structure. Because the liquid crystal polymer has the characteristics of high strength, high heat resistance and high flame retardancy, it can comprehensively improve the performance of the diaphragm. , so as to achieve the purpose of improving the safety factor of lithium batteries.

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 or low temperature will cause the performance of lithium batteries to decrease, and the life and capacity will be reduced. 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, the general optimal operating temperature is 30-60°C, beyond this range, the performance and safety of the battery will be affected. In the test of lithium battery to withstand high temperature, there are extreme temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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