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Compound nanofiber diaphragm for lithium ion power battery and manufacturing method

A nanofiber, power battery technology, applied in battery pack parts, chemical instruments and methods, circuits, etc., can solve the problem of poor heat resistance, poor safety, and small difference between film breaking temperature and closed-cell temperature of power lithium battery separators. problems, to achieve the effect of increasing the closed-cell temperature difference, enhancing safety, and increasing the film breaking temperature

Inactive Publication Date: 2011-11-02
CHINA ZHEJIANG GREAT SOUTHEAST GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the disadvantages of poor heat resistance, small difference between membrane rupture temperature and closed cell temperature, and poor safety of existing power lithium battery separators, the present invention provides a method for improving heat resistance and increasing membrane rupture temperature. Composite nanofiber diaphragm for lithium-ion power battery with enhanced safety and closed cell temperature difference and manufacturing method thereof

Method used

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  • Compound nanofiber diaphragm for lithium ion power battery and manufacturing method
  • Compound nanofiber diaphragm for lithium ion power battery and manufacturing method
  • Compound nanofiber diaphragm for lithium ion power battery and manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0045] refer to figure 1 , a composite nanofiber separator for a lithium-ion power battery, the composite nanofiber separator for a lithium-ion power battery includes an upper layer 1, an upper middle layer 4, a middle layer 2, a lower middle layer 5, and a lower layer 3; the upper layer 1, the middle layer 2 and The lower layer 3 is a PET nanofiber layer, the middle and upper layers 4 and the middle and lower layers 5 are PE nanofiber layers, the middle and lower layers cover the lower layer, the middle layer covers the middle and lower layers, and the middle and upper layers cover On the middle layer, the upper layer overlies the upper middle layer;

[0046] In the composite nanofiber separator for lithium-ion power batteries, the mass content of the upper layer, middle layer, and lower layer is independently 17-21%, and the upper-middle layer and lower-middle layer are 19.5%-23.5%;

[0047] The upper and lower layers both include PET, SEBS, PS-g-ECMA and nano TiO 2 , the ...

Embodiment 2

[0062] refer to figure 1 , in the present embodiment, the mass content of the upper layer is 18.5%, the mass content of the middle and upper layers is 23.5%, the mass content of the middle layer is 17%, the mass content of the middle and lower layers is 20.5%, and the mass content of the lower layer is 21%.

[0063] In the upper layer and the lower layer, the mass ratio of the four components is: 15 parts of PET, 1.1 parts of SEBS, 2.1 parts of PS-g-ECMA, nano-TiO 2 1.1 copies;

[0064] In the middle and lower layers, the mass ratio of the four components is: 15 parts of PET, 1.1 parts of SEBS, 1.6 parts of PS-g-ECMA, nano-TiO 2 1.1 copies;

[0065] The middle and lower layers and the middle and upper layers include PE, PS-g-ECMA and nano TiO 2 , the mass ratio of the three components is: 18 parts of PE, 1.6 parts of PS-g-ECMA, nano-TiO 2 0.6 parts.

[0066] Other schemes of this embodiment are all the same as in Embodiment 1.

Embodiment 3

[0068] refer to figure 1 , In the present embodiment, the mass content of the upper layer is 21%, the mass content of the middle and upper layers is 19.5%, the mass content of the middle layer is 21%, the mass content of the middle and lower layers is 19.5%, and the mass content of the lower layer is 20%.

[0069] In the upper layer and the lower layer, the mass ratio of the four components is: 15 parts of PET, 1.2 parts of SEBS, 2.3 parts of PS-g-ECMA, nano-TiO 2 1.4 copies;

[0070]In the middle and lower layers, the mass ratio of the four components is: 15 parts of PET, 1.4 parts of SEBS, 2.1 parts of PS-g-ECMA, nano-TiO 2 1.35 copies;

[0071] The middle and lower layers and the middle and upper layers include PE, PS-g-ECMA and nano TiO 2 , the mass ratio of the three components is: 18 parts of PE, 2.2 parts of PS-g-ECMA, nano-TiO 2 01.2 parts.

[0072] Other schemes of this embodiment are all the same as in Embodiment 1.

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Abstract

The invention discloses a compound nanofiber diaphragm for a lithium ion power battery. The compound nanofiber diaphragm comprises an upper layer, an upper middle layer, a middle layer, a lower middle layer and a lower layer, wherein the upper, middle and lower layers are polyethylene terephthalate (PET) nanofiber layers; the upper and lower middle layers are polyethylene nanofiber layers; the lower middle layer is covered on the lower layer; the middle layer is covered on the lower middle layer; the upper middle layer is covered on the middle layer; and the upper layer is covered on the upper middle layer. Or the compound nanofiber diaphragm adopts a three-layer structure form. The invention also provides the compound nanofiber diaphragm for the lithium ion power battery and a manufacturing method thereof. By the compound nanofiber diaphragm for the lithium ion power battery and the manufacturing method thereof, heat resistance is improved, a difference value between diaphragm rupturing temperature and obturating temperature is increased, and security is enhanced.

Description

technical field [0001] The invention relates to a diaphragm for a lithium-ion power battery and a manufacturing method thereof. Background technique [0002] Lithium-ion batteries (referred to as lithium batteries) have outstanding advantages such as high energy density, high power, long cycle life, high voltage, no memory effect, and environmental protection. They have become a new energy source vigorously developed in the world today and are widely used in automobiles, communications , aerospace, household appliances and many other fields. [0003] Lithium batteries are mainly composed of positive electrodes, negative electrodes, electrolytes, diaphragms, and casings. Among them, the diaphragm is an important part of lithium batteries. Its function is to isolate the positive and negative electrodes, so that the electrons in the battery cannot pass freely, and the electrolyte ions—— Lithium ions flow freely between the positive and negative electrodes. The size of the lit...

Claims

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Application Information

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IPC IPC(8): H01M2/16B32B27/02B32B27/08B32B27/36B32B27/32B32B27/18
CPCY02E60/12Y02E60/10
Inventor 黄水寿黄飞钢郭加义
Owner CHINA ZHEJIANG GREAT SOUTHEAST GRP
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