Solvothermal preparation of carbon coated V6O13 nanocomposite as cathode material for lithium-ion battery

摘要

Two-dimensional rod-shaped carbon coated V6O13 was prepared by simple solvothermal method using V2O5, C2H5O7 (Ethanol absolute) and C6H12O6 (Glucose) as raw materials. The results indicated that proper carbon coating improved the cycle stability of V6O13. The carbon coated V6O13 composites (CNPs-V6O13) exhibit a capacity retention of 67.8% after 100 cycles at 0.1 C (42 mA/g) and a discharge capacity of 227.93 mAh/g after 100 cycles at 1 C, comparing to those of the pure V6O13 of only 47.6% and 51.2 mAh/g. The results of EIS and XPS tests provide evidence that the improved electrochemical properties are mainly attributed to the suppress the irreversible chemical dissolution of V3+ and the improvement of structural stability of the material by coating.