Polyalcohol microporous barrier for high ratio polyalcohol lithium ion power cell

A technology of power battery and microporous membrane, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor liquid absorption capacity, unsuitable for charging and discharging of high current, and high rate performance cannot meet the requirements of electric vehicles, etc. The effect of high rate discharge performance and good liquid absorption ability

Active Publication Date: 2008-04-02
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymer lithium-ion battery assembled with this polymer electrolyte membrane has excellent charge-discharge performance and cycle life, but it is not suitable for high-current charge-discharge, and cannot be used as a microporous membrane for high-rate lithium-ion power batteries.
[0004] The diaphragm is an important part of the lithium-ion battery. The PP/PE/PP film used in the liquid lithium-ion battery ha

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1

[0017] 1200g of copolymer of vinylidene fluoride and hexafluoropropylene, 1800g of dibutyl phthalate, 650g of silica and 8500 of acetone were stirred and dissolved to prepare a viscous, colorless and transparent polymer solution, which was cast on The PET film is dried and then extracted in methanol, dried in a vacuum, and finally a microporous film is obtained, which is immersed in an electrolyte to obtain a gel polymer electrolyte film. The copolymer of vinylidene fluoride and hexafluoropropylene is referred to as PVDF-HFP, and the content of the copolymerized monomers is arbitrary.

Example Embodiment

[0018] Example 2

[0019] Stir and dissolve 1200g PVDF-HFP, 1800g dibutyl phthalate, 650g aluminum oxide and 8500g acetone to prepare a viscous, colorless and transparent polymer solution, which is cast on the PET film and dried. It is extracted in ether, vacuum-dried to finally obtain a polymer electrolyte membrane, and vacuum-dried to finally obtain a microporous membrane, which is immersed in an electrolyte to obtain a gel polymer electrolyte membrane.

Example Embodiment

[0020] Example 3

[0021] Stir and dissolve 1200g PVDF-HFP, 1800g propylene carbonate, 650g silica and 8500g acetone to prepare a viscous, colorless and transparent polymer solution, which is cast on a PET film, dried and then extracted in methanol. After vacuum drying, the microporous membrane is finally obtained, and the gel polymer electrolyte membrane is obtained by soaking in the electrolyte.

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PUM

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Abstract

The present invention relates to a polymer microporous membrane for high-rate polymer lithium-ion power battery. The polymer microporous membrane is mainly used in gel polymer lithium-ion power battery. The power battery can provide powered power supply for equipment of high energy consumption and large current discharge, such as an electric vehicle, an electric motorcycle, uninterruptible power supply and so on. The microporous membrane is made of polymer material, inorganic filler, plasticizer and organic solvent. The porosity rate is between 20 percent and 70 percent. After treatment, the microporous membrane can be transformed into electrolyte membrane; the high-rate gel polymer lithium-ion power battery can be made with a square-layered battery structure. The power battery has excellent high-rate charge and discharge performances and security performances.

Description

technical field [0001] The invention relates to a polymer microporous membrane for high-rate polymer lithium-ion power batteries, which is mainly used in gel polymer lithium-ion power batteries. The power batteries can be used for high energy consumption such as electric vehicles, electric motorcycles and uninterruptible power supplies , Provide power supply for equipment that requires high current discharge. Background technique [0002] As the world is facing increasingly serious environmental problems and future oil and other energy sources will be exhausted, seeking renewable energy has become an urgent task for mankind. Power battery, as one of the new green power sources that developed countries in the world focus on developing, has a good market application prospect in electric vehicles, electric motorcycles, electric tools, mobile electronic equipment, etc. The current power batteries mainly include lead-acid batteries, nickel-cadmium batteries and lithium-ion batte...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L27/16C08L33/20C08L33/06C08L23/00C08L31/04C08K5/3415H01M10/40C08K3/36C08K3/22C08K5/109
CPCY02E60/122
Inventor 邓龙征郑利峰张兴国唐伟张克俭何峰俞琴
Owner WANXIANG 123 CO LTD
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