In-depth Investigation of Process-structure- property Relationship in Li-ion Battery Cathode Materials

摘要

1) A novel V_2O_5/graphene hybrid has been developed through a sol-gel process with the extraordinary electrochemical performance, 438 mAh/g, (achieving almost theoretical specific capacity of 443 mAh/g), with only 2% graphene in the hybrid. 2) The AC impedence confirmed the increased conductivity. 3) TGA and in operando HEXRD indicated the enhanced thermal stability of the V_2O_5 hybrid, resulting the significant improvement on rate performance and cycle life. 4) The electrochemical performance and in situ XANES confirmed the reversible structure evolution during charge/discharge process.