Preparation Technology of Silicon–Carbon Composite Anode Material Based on Expanded Graphite for Lithium-Ion Battery for Vehicles
By the method of directly inserting the silicon source into the expanded graphite layer, the silicon-rich expanded graphite was obtained. Then, the silicon carbon composite negative electrode material was prepared by ball-milling the silicon-rich expanded graphite and the commercialized graphite material. The result of the physical properties and the electrochemical performance of the material showed that the initial reversible specific capacity reached 761.6 mAh/g at 70 mA/g. After 100 cycles, the capacity retention rate was 90.63%. The expanded graphite was used to buffer the expansion of silicon. The preparation process was simple and suitable for industrial batch production.
KeywordsLi-ion battery Silicon–carbon composite anode materials Expanded graphite Electrochemical performance Silicon-rich expanded graphite
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