Negative active material, method for preparing the same, and lithium ion battery
By introducing crosslinking agents and catalysts into silicon-based anode materials to form a three-dimensional crosslinked network, the problems of insufficient cohesion and decreased cycle performance caused by volume changes during charging and discharging of silicon-based anode materials are solved, thereby improving cohesion and reducing expansion rate, and improving the cycle life of lithium-ion batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU RELIANCE ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2026-05-26
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, silicon-based anode materials exhibit significant volume changes during charging and discharging, leading to insufficient cohesion of the anode coating, deformation of the cell casing, and decreased cycle performance. Simply increasing the amount of binder or using a high-viscosity binder cannot effectively solve these problems.
By introducing a crosslinking agent and catalyst containing at least two epoxy ring functional groups into the negative electrode active material, low-temperature rapid crosslinking is carried out to form a three-dimensional crosslinking network, which enhances cohesion and restricts the volume expansion of silicon particles, thereby improving cycle life.
Without increasing the amount of binder, it significantly improves the cohesiveness of the negative electrode active material coating, reduces the fully charged expansion rate, improves cycle life, and maintains the stability of electron and ion transport channels.
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