Ion selective functional diaphragm as well as preparation method and application thereof

An ion-selective and ion-selective technology, applied in the field of battery diaphragm materials, can solve problems such as not being 100% effective, and achieve the effect of improving battery attenuation and capacity retention

Pending Publication Date: 2021-12-07
CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it turns out that none of the above methods are 100% effective

Method used

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  • Ion selective functional diaphragm as well as preparation method and application thereof
  • Ion selective functional diaphragm as well as preparation method and application thereof
  • Ion selective functional diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) First introduce poly-4-vinylpyridine into deionized water according to the mass ratio of 1.2wt%, and introduce a dispersant to stir and mix, then add ceramic powder, add a binder and a wetting agent, mix evenly, and prepare into slurry;

[0024] (2) The diaphragm is sent into the coating device, and the slurry prepared in step (1) is used for coating;

[0025] (3) drying and winding the membrane coated in step (2) to obtain an ion-selective functional membrane.

[0026] The membrane surface photo of the ion-selective functional diaphragm prepared in embodiment 1 is as follows figure 1 shown.

Embodiment 2

[0028] (1) First introduce poly-4-vinylpyridine into deionized water according to the mass ratio of 2wt%, and introduce a dispersant to stir and mix, then add ceramic powder, add a binder and a wetting agent, mix evenly, and prepare slurry;

[0029] (2) The diaphragm is sent into the coating device, and the slurry prepared in step (1) is used for coating;

[0030] (3) drying and winding the membrane coated in step (2) to obtain an ion-selective functional membrane.

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Abstract

The invention discloses an ion selective functional diaphragm as well as a preparation method and application thereof. The ion selective functional diaphragm comprises a diaphragm and an ion selective functional coating coated on one side or two sides of the diaphragm, and the ion selective functional coating is formed by coating slurry containing an ion selective material. According to the invention, the transition metal ions are selectively prevented from penetrating on the premise of ensuring the penetrability of the lithium ions by utilizing the selectivity of the ion selective material to the transition metal ions, so the purpose of preventing the transition metal ions dissolved in the positive electrode from migrating and depositing to the negative electrode is achieved, and the attenuation of the battery is improved. Experiments show that the content of the transition metal deposited on the negative electrode SEI is reduced from 182ppm to 101ppm by the ion selective functional diaphragm disclosed by the invention, and the capacity retention rate of the LMO / graphene battery in circulation is increased by 2.3 times.

Description

technical field [0001] The invention belongs to the field of battery diaphragm materials, and in particular relates to an ion-selective functional diaphragm and its preparation method and application. Background technique [0002] Vehicle electrification is one of the revolutionary changes in the automotive transportation industry today, and to adapt to this change, lithium-ion batteries (LIBs) will become the main technology choice for vehicle electrification in the foreseeable future. Compared with lithium batteries in the portable electronics and grid storage battery markets, electric vehicles require lithium batteries to have higher duty cycles (ie, wide operating temperature and high charge and discharge rates) and durability (expected life of 10 years) . Therefore, although steady and remarkable progress has been made in the development of various cathode and anode active materials. There are still considerable challenges for lithium-ion batteries in terms of mileage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/497H01M50/449H01M50/403H01M10/0525
CPCH01M10/0525H01M2220/20Y02E60/10
Inventor 王志豪陶晶杜辉王思双欧阳玲萍陈瀚
Owner CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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