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High-temperature resistant diaphragm material of lithium ion battery and preparation method of high-temperature resistant diaphragm material

A technology for lithium-ion batteries and diaphragm materials, applied in the field of high-temperature-resistant diaphragm materials and preparations for lithium-ion batteries, can solve the problems of reduced safety, limited temperature resistance, and low puncture strength of lithium-ion batteries, and achieve high-temperature thermal shrinkage Low temperature, low closed cell temperature, high puncture strength effect

Active Publication Date: 2016-03-02
浙江锂盾储能材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limitations of this commercial polyolefin film are: limited temperature resistance, usually below 150°C, which reduces the safety of lithium-ion batteries
This diaphragm has only a single layer structure and has low puncture strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of a lithium-ion battery high-temperature-resistant diaphragm material, comprising the following steps:

[0043] 1) Using the modified nylon film as the base film, coating heat-dissipating paint on both sides of the modified nylon film to form a heat-dissipating paint layer to obtain a composite film;

[0044] The modified nylon film is a film formed by a mixture of nylon and polyolefin; the polyolefin is ethylene-vinyl acetate copolymer; the weight fraction of polyolefin is 10%;

[0045] The heat-dissipating paint used in the heat-dissipating paint layer is a mixture of water-based silicone resin and filler; the filler is silicon carbide; the weight fraction of the filler is 10%; the thickness of the heat-dissipating paint layer is 1 μm.

[0046] 2) Vacuum dry the composite film, and then perform biaxial stretching; the drying temperature of vacuum drying is 60°C, and the drying time is 10 minutes; the longitudinal and transverse stretch ratio of b...

Embodiment 2

[0050] A preparation method of a lithium-ion battery high-temperature-resistant diaphragm material, comprising the following steps:

[0051] 1) Using the modified nylon film as the base film, coating heat-dissipating paint on both sides of the modified nylon film to form a heat-dissipating paint layer to obtain a composite film;

[0052] The modified nylon membrane is a membrane formed by a mixture of nylon and polyolefin; the polyolefin is a mixture of ethylene-propylene copolymer and ethylene-butylene copolymer (weight ratio 1:1); the weight fraction of polyolefin 55%;

[0053] The heat dissipation paint used in the heat dissipation paint layer is a mixture of water-based silicone resin and filler; the filler is a mixture of silicon carbide, carbon black and carbon nanotubes (weight ratio 1:1:1); the weight fraction of the filler is 45 %; The thickness of the heat dissipation coating layer is 10 μm.

[0054] 2) Vacuum dry the composite film, and then perform biaxial stretc...

Embodiment 3

[0058] A preparation method of a lithium-ion battery high-temperature-resistant diaphragm material, comprising the following steps:

[0059] 1) Using the modified nylon film as the base film, coating heat-dissipating paint on both sides of the modified nylon film to form a heat-dissipating paint layer to obtain a composite film;

[0060] The modified nylon film is a film formed by a mixture of nylon and polyolefin; the polyolefin is an ethylene-propylene copolymer; the weight fraction of polyolefin is 35%;

[0061] The heat-dissipating paint used in the heat-dissipating paint layer is a mixture of water-based silicone resin and filler; the filler is carbon nanotubes; the weight fraction of the filler is 25%; the thickness of the heat-dissipating paint layer is 5 μm.

[0062] 2) Vacuum dry the composite film, and then perform biaxial stretching; the drying temperature of vacuum drying is 75°C, and the drying time is 30 minutes; the longitudinal and transverse stretch ratio of b...

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PUM

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Abstract

The invention discloses a high-temperature resistant diaphragm material of a lithium ion battery and a preparation method of the high-temperature resistant diaphragm material. The diaphragm material comprises a modified nylon membrane and a cooling coating layer, wherein the two surfaces of the modified nylon membrane are coated with the cooling coating layer. The preparation method of the diaphragm material comprises the following steps of 1, taking the modified nylon membrane as a base membrane, and coating the two surfaces of the modified nylon membrane with a cooling coating to form the cooling coating layer and obtain a composite membrane; 2, carrying out vacuum drying on the composite membrane in the step 1, and then carrying out bidirectional stretching on the composite membrane; and 3, carrying out plasma processing on the stretched composite membrane in the step 2 to obtain the finished diaphragm. The diaphragm material has the characteristics of uniform pore distribution, excellent cooling performance, low high-temperature thermal shrinkage rate, high liquid absorption rate and high application safety.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a high-temperature-resistant diaphragm material for a lithium-ion battery and a preparation method thereof. Background technique [0002] Due to the advantages of high voltage, high energy, long cycle life and no pollution to the environment, lithium-ion batteries have been applied in more and more fields, such as mobile phones, notebook computers, electric bicycles and power vehicles. [0003] Lithium-ion batteries generally include a packaging case and a battery cell contained in the packaging case. The battery cell generally includes a positive electrode, a negative electrode, an electrolyte, and a separator spaced between the positive electrode and the negative electrode. Among them, the separator is a very important component. It is a porous membrane with ion conduction and electronic insulation, which plays a role of isolation between the positive electrode and the negative electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/613H01M10/653H01M10/654H01M50/403H01M50/409H01M50/417H01M50/423H01M50/489
CPCH01M10/0525H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 章结兵谢凤秀
Owner 浙江锂盾储能材料技术有限公司
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