负极极片及其制备方法和电池
By introducing a functionalized graphene shell and a polymer buffer layer into the titanium dioxide anode sheet, the conductivity and volume change problems of titanium dioxide anode materials are solved, thereby improving the rate performance and cycle stability of lithium-ion batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG JINKO ENERGY STORAGE CO LTD
- Filing Date
- 2026-03-31
- Publication Date
- 2026-07-17
AI Technical Summary
When titanium dioxide is used as a negative electrode material for lithium-ion batteries, its low electronic conductivity and ion diffusion rate result in poor rate performance. Furthermore, significant volume changes occur during lithium-ion insertion/extraction, leading to low capacity retention at high rates.
Functionalized graphene is used as the shell material. Graphene is connected to titanium dioxide through linking groups. A polymer buffer layer is set between the functionalized graphene shell and the titanium dioxide core to form a buffer layer with a molecular weight gradient distribution, which improves the aggregation and interfacial bonding of graphene. At the same time, it adapts to the volume expansion and contraction of TiO2 through elastic deformation.
It improves the interfacial bonding force between graphene and TiO2, enhances rate performance and cycle stability, reduces the capacity retention caused by TiO2 volume expansion, and achieves a highly efficient electrical conductivity network and dynamic adaptability.
Smart Images
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