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Preparation method of high-rigidity lithium-ion battery separator and made separator

A lithium-ion battery, high-rigidity technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of lithium dendrite piercing and insufficient rigidity of the separator

Active Publication Date: 2019-10-29
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of insufficient rigidity of the lithium-ion battery diaphragm in the prior art, which is easily pierced by lithium dendrites, and provide a method for preparing a high-rigidity lithium-ion battery diaphragm and the obtained high-rigidity lithium-ion battery diaphragm

Method used

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  • Preparation method of high-rigidity lithium-ion battery separator and made separator
  • Preparation method of high-rigidity lithium-ion battery separator and made separator

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The isotacticity of material ① is 98, the melt index is 2.0g / 10min, the weight average molecular weight is 350000, and the molecular weight distribution is 5.2; the isotacticity of material ② is 93, the melt index is 1.8g / 10min, and the weight average molecular weight is 450000. The molecular weight distribution is 3.0; material ①: material ② is 9.5:0.5; mixing is 600rpm, 5h; ℃ annealing for 15 hours; then longitudinal stretching, the cold drawing temperature is 80 ℃, the ratio is 1.1; the hot drawing temperature is 150 ℃, the ratio is 2.0; the setting temperature is 160 ℃, and the setting time is 10min. A 16 μm thick, 40% porosity sample was prepared.

Embodiment 2

[0031] The isotacticity of material ① is 98, the melt index is 2.0g / 10min, the weight average molecular weight is 350000, and the molecular weight distribution is 5.2; the isotacticity of material ② is 89, the melt index is 1.6g / 10min, and the weight average molecular weight is 470000. The molecular weight distribution is 3.0; material ①:material ② is 9.5:0.5; the mixing is 600rpm, 5h; the extrusion temperature is 230°C, the die temperature is 205°C, the casting roll is 75°C, and a 16μm thick diaphragm is prepared by winding. 1500m, and then annealed at 140°C for 15 hours; then stretched longitudinally, the cold drawing temperature is 80°C, and the magnification is 1.1; the hot drawing temperature is 150°C, and the magnification is 2.0; the setting temperature is 160°C, and the setting time is 10min. A 16 μm thick, 40% porosity sample was prepared.

Embodiment 3

[0033] The isotacticity of material ① is 98, the melt index is 2.0g / 10min, the weight average molecular weight is 350000, and the molecular weight distribution is 5.2; the isotacticity of material ② is 89, the melt index is 1.6g / 10min, and the weight average molecular weight is 470000. The molecular weight distribution is 3.3; material ①:material ② is 8.5:1.5; the mixing is 800rpm, 6h; the extrusion temperature is 230°C, the die temperature is 205°C, the casting roll is 75°C, and a 16μm thick diaphragm is prepared by winding. 1500m, and then annealed at 140°C for 15 hours; then stretched longitudinally, the cold drawing temperature is 80°C, and the magnification is 1.1; the hot drawing temperature is 150°C, and the magnification is 2.0; the setting temperature is 160°C, and the setting time is 10min. A 16 μm thick, 40% porosity sample was prepared.

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Abstract

The application provides a preparation method of a high-rigidity lithium-ion battery separator. Two polypropylene materials with large difference in isotacticity and weight average molecular weight are adopted, the polypropylene materials with high isotacticity and weight average molecular weight account for a large proportion, and the elastic modulus of the prepared separator can be improved by 1.5-2 times compared with that of a common separator prepared from a single polypropylene material through the processes of material mixing, extrusion casting, annealing, stretching and heat setting, so that the high-rigidity separator is prepared, and the rest physical and chemical properties of the separator are basically kept unchanged. The high-rigidity separator is used as a lithium ion battery separator, can reduce the problems that the separator is easily pierced by lithium dendrites and folds of the separator in winding in the use process of the lithium ion battery, and improves the safety of the lithium ion battery in the use process.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and in particular relates to a preparation method of a high-rigidity lithium-ion battery diaphragm and the prepared high-rigidity lithium-ion battery diaphragm. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, good safety, and long cycle life, and are widely used in many industries and fields such as digital products, electric motorcycles, electric vehicles, and energy storage. With the continuous expansion of the application field of lithium-ion batteries and the deepening of the influence of lithium-ion products in people's lives, people's requirements for the performance of lithium-ion batteries are also getting higher and higher. [0003] The four major components of a lithium-ion battery are positive electrode material, negative electrode material, electrolyte, and separator. As one of the important components of lithium-...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16B29C69/02B29C71/02B29K23/00B29L7/00
CPCB29C69/02B29C71/02B29C2071/022B29K2023/12B29L2007/00H01M50/403H01M50/411Y02E60/10
Inventor 刘建金范宇姚坤陈官茂
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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