负极组合物、负极浆料、负极极片、二次电池及含有该二次电池的用电装置
By using POSS block copolymers and polyester plasticizers with specific structures in the negative electrode composition of secondary batteries, the cracking problem of the negative electrode film layer as the thickness and speed increase are solved, achieving a balance between high energy density and good cycle performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2022-03-04
- Publication Date
- 2026-07-17
AI Technical Summary
In the process of increasing the thickness of the negative electrode film and the coating speed to improve the energy density, existing secondary batteries are prone to problems such as film cracking, difficulty in electrolyte wetting, and poor kinetics, which affect cycle performance and safety.
A negative electrode composition is formed by using a block copolymer containing POSS and a polyester containing -[O-CH(CH3)-C(=O)]- structural units as plasticizers, combined with an organic solvent with a boiling point of 160℃~250℃. The plasticizer is uniformly dispersed in the polymer binder and CMC molecular network, reducing strong hydrogen bonding, improving flexibility and electrolyte affinity, and reducing drying stress.
It effectively reduces the brittleness of the negative electrode film, reduces cracking, improves electrolyte wetting performance and lithium-ion conductivity, enhances the cycle performance and rate performance of secondary batteries, and maintains stable electrochemical performance.
Smart Images
Figure CN117378062B_ABST