Polyethylene composition for manufacturing lithium battery high-strength high-fusing temperature diaphragm

A lithium battery separator, high-density polyethylene technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of insufficient fusing temperature of polyethylene lithium battery separator, insufficient to maintain the safety of power lithium battery, etc. Excellent tensile properties and elongation at break, excellent mechanical properties, the effect of improving mechanical properties

Inactive Publication Date: 2016-01-20
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing polyethylene lithium battery separator has insufficient fusing temperature and not enough to maintain the safety of the power lithium battery, and solve the cont

Method used

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  • Polyethylene composition for manufacturing lithium battery high-strength high-fusing temperature diaphragm

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Example Embodiment

[0028] Example 1

[0029] Mix 30 parts by weight of polyethylene material with 70 parts by weight of liquid paraffin, wherein the proportion of polyethylene material is per 100 parts by weight of polyethylene material, containing 10 parts by weight and the molecular weight is 7×10 6 The ultra-high molecular weight polyethylene resin, 70 parts by weight has a molecular weight of 3×10 6 The ultra-high molecular weight polyethylene resin, 18.5 parts by weight, the molecular weight is 7×10 5 High-density polyethylene resin, 1.5 parts by weight, molecular weight 6×10 4 The linear low density polyethylene resin. Extruded by a twin-screw extruder and salivated through a die into a 0.4mm thick film blank. After pre-extraction, stretching, extracting the diluent, shaping, and annealing, a 16μm thick lithium battery separator was prepared. See attached table 1 for specific stretching and irradiation process and film properties.

Example Embodiment

[0030] Example 2

[0031] Mix 35 parts by weight of polyethylene material with 65 parts by weight of microporous filler oil, wherein the polyethylene material

[0032] The proportion of the material is per 100 parts by weight of polyethylene material, containing 1 part by weight of molecular weight 8×10 6 The ultra-high molecular weight polyethylene resin, 55 parts by weight has a molecular weight of 4.5×10 6 Ultra-high molecular weight polyethylene resin, 43.5

[0033] Parts by weight molecular weight is 4.5×10 5 High-density polyethylene resin, 0.5 parts by weight, molecular weight 4.0×10 4 The linear low density polyethylene resin. Extruded by a twin-screw extruder and salivated through a die into a 0.4mm thick film blank. After pre-extraction, stretching, extraction of diluent, shaping, annealing, and irradiation, a 20μm thick lithium battery separator was prepared. See attached table 1 for specific stretching and irradiation process and film properties.

Example Embodiment

[0034] Example 3

[0035] Mix 15 parts by weight of polyethylene material with 85 parts by weight of white oil, wherein the proportion of polyethylene material is per 100 parts by weight of polyethylene material, containing 15 parts by weight and the molecular weight is 9×10 6 The ultra-high molecular weight polyethylene resin, 60 parts by weight has a molecular weight of 4×10 6 Of ultra-high molecular weight polyethylene resin, 23 parts by weight, molecular weight 8×10 5 Of high-density polyethylene resin, 2 parts by weight, molecular weight 8×10 4 The linear low density polyethylene resin. Extruded by a twin-screw extruder and salivated through a die into a 0.4mm thick film blank. After pre-extraction, stretching, diluent extraction, shaping, annealing, and irradiation, a 25μm thick lithium battery separator was prepared. See attached table 1 for specific stretching and irradiation process and film properties.

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Abstract

The invention discloses a polyethylene composition for preparing a power lithium battery diaphragm, and the composition is formed by blending polyethylene resin and diluent. According to an ultra-high molecular weight polyethylene/high density polyethylene/linear low density polyethylene/diluent system, the character of mechanical property of the diaphragm can be greatly improved by means of ultra-high molecular weight polyethylene, and the mechanical strength of a lithium battery diaphragm finished product is improved. Linear low density polyethylene can produce enough free radicals under low irradiation intensity, a polyethylene chain of a long molecular chain is protected, and the lithium battery diaphragm finished product keeps the excellent mechanical property and has the high fusing-off temperature. According to the lithium battery diaphragm prepared through the polyethylene composition, high porosity, high insulativity and good turn-off characteristic of an ordinary polyethylene lithium battery diaphragm are kept, high tearing strength, high puncture resistance strength and high-fusing temperature are achieved, and the polyethylene composition is suitable for manufacturing power lithium batteries.

Description

technical field [0001] The invention relates to a polyethylene composition used for manufacturing high-strength and high-fusing temperature diaphragms for lithium-ion batteries. Background technique [0002] In the structure of lithium batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. Nowadays, with the rapid development of new energy vehicles, the market requires power lithium battery products that can provide large capacity and high power density. Compared with ordinary lithium batteries, power lithium-ion batteries have larger capacity and higher charge and discharge currents, so the battery separator must have high strength and a higher fusing temperature to ...

Claims

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Application Information

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IPC IPC(8): C08L91/06C08L91/00C08L23/06C08L23/08C08J5/22H01M2/14H01M50/403H01M50/417H01M50/489H01M50/491H01M50/494
CPCY02E60/10
Inventor 叶钢何敏刘必前
Owner INST OF CHEM CHINESE ACAD OF SCI
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