Enhanced lithium battery diaphragm and manufacturing method thereof

A lithium battery separator and manufacturing method technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of thermal shrinkage, fall off, and affect the overall performance of the separator, and achieve improved tensile strength, low thermal shrinkage, The effect of increasing the temperature difference

Active Publication Date: 2020-01-14
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the safety of the lithium-ion battery separator, the most common method is to apply ceramic slurry coating to the polymer separator or to prepare a multi-layer separator by co-extrusion technology. The coating process is coated on the surface of the basic separator. Ceramic particles may also fall off d

Method used

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  • Enhanced lithium battery diaphragm and manufacturing method thereof
  • Enhanced lithium battery diaphragm and manufacturing method thereof
  • Enhanced lithium battery diaphragm and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1 Raw material ratio: 80 parts by weight of high molecular weight polyethylene, with a viscosity average molecular weight of 1 million; 20 parts by weight of high molecular weight polypropylene, with a viscosity average molecular weight of 1.2 million; 3 parts by weight of ethylene-propylene copolymer, with an ethylene content of 52 %, Mooney viscosity 83; 0.1 parts by weight of antioxidant is 0.06 parts by weight of antioxidant 1010 and 0.04 parts by weight of antioxidant 168 compound;

Embodiment 2

[0046] Example 2 Raw material ratio: 78 parts by weight of high molecular weight polyethylene, with a viscosity average molecular weight of 600,000; 22 parts by weight of high molecular weight polypropylene, with a viscosity average molecular weight of 1 million; 3 parts by weight of ethylene-propylene copolymer, with an ethylene content of 52 %, Mooney viscosity 83; 0.1 parts by weight of antioxidant is 0.06 parts by weight of antioxidant 1010 and 0.04 parts by weight of antioxidant 168 compound; performance comparison is shown in Table 2:

Embodiment 3

[0053] Example 3 Raw material ratio: 78 parts by weight of high molecular weight polyethylene with a viscosity average molecular weight of 1.2 million; 22 parts by weight of high molecular weight polypropylene with a viscosity average molecular weight of 1.5 million; 2.5 parts by weight of ethylene propylene copolymer with an ethylene content of 54 %, Mooney viscosity 105; 0.1 parts by weight of antioxidant is 0.06 parts by weight of antioxidant 1010 and 0.04 parts by weight of antioxidant 168 compound; performance comparison is shown in Table 3:

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Abstract

The invention relates to an enhanced lithium battery diaphragm and a manufacturing method thereof. The temperature difference between the closed cell temperature and the film breaking temperature is 15-25 DEG C, and the small cutting degradation percentage caused by edge collapse is less than 0.3%.The heat shrinkage rate is less than 1.5% in MD direction and less than 1% in TD direction. The raw material of the enhanced lithium battery diaphragm is a blend, and the raw material weight parts of the blend include 70-85 parts of high molecular weight polyethylene, 15-30 parts of high molecular weight polypropylene, 0.01-5 parts of ethylene-propylene copolymer and 0.01-0.3 part of antioxidant. The blend diaphragm has simple preparation process and can be produced without modifying the originalproduction equipment and can be widely applied to the field of lithium battery diaphragm manufacturing.

Description

technical field [0001] The invention relates to the technical field of diaphragm production, in particular to a reinforced lithium battery diaphragm and a manufacturing method thereof. Background technique [0002] In lithium-ion batteries, the separator is a very important part and one of the four key materials in the battery. The lithium battery separator plays the role of separating the positive and negative electrodes to prevent short circuit, and also provides a path for the conductive ions in the electrolyte. The separator The performance of the separator determines the capacity, cycle performance, safety performance and other characteristics of the battery. Therefore, the performance of the separator has an important impact on the overall performance of the battery. [0003] The current development trend of lithium batteries is higher energy density. Therefore, only a thinner separator can provide more space for the electrode material, thereby improving the energy den...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/411
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 程跃熊磊石广钦赵彪张有恒
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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