Polymer coated electrode active material, preparation and use thereof
By spray-drying the coated polymer coating on the NCM cathode material, the problem of poor circulation stability of NCM cathode material in solid-state lithium-ion batteries is solved, and higher circulation performance and active substance utilization are achieved.
CN120113053APending Publication Date: 2025-06-06JUSTUS LIEBIG UNIV GIESSEN
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Patent Information
- Application Number
- CN202380075569.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-09-30
- Filing Date
- 2023-09-29
- Publication Date
- 2025-06-06
AI Technical Summary
Technical Problem
In solid-state lithium-ion batteries, there is a problem of rapid capacity attenuation during the circulation of NCM cathode materials, mainly due to the formation of interfaces and cracks, which lead to contact loss and increased lithium diffusion path length.
Method used
A polymer coating, such as poly((4-vinylbenzyl)trimethylammonium bis(trifluoromethanesulfonimide)) (PVBTA-TFSI) is uniformly coated on NCM by a spray drying process to stabilize the interface between the electrode active material and the solid electrolyte.
Benefits of technology
It significantly improves the long-term circulation performance and active substance utilization rate of NCM, reduces interface degradation and mechanical rupture, and enhances the cycling stability of the battery.
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Abstract
The present invention provides a coated particulate material comprising a plurality of core particles wherein each core particle comprises at least one compound of formula (I), Li1 + w [Ni1-x-y-zCoxMnyMz] 1-wO2, and the surface of the core particles exhibits a coating comprising at least one polycationic organic polymer or at least one polyanionic organic polymer.
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