부산대학교 도서관

The high capacity and cycling performance are important for the lithium-ion battery (LIB). V2O5 is considered a good active material among various potential candidates due to its low cost, abundant availability, and high energy density, however, the disadvantage of lower cycling performance is difficult to solve due to structural instability during the charging and discharging process. Here, we prepared composite microspheres of Co-doped V2O5 by a simple solvothermal method for solving structural instability. As the cathode material in LIBs, the V2O5-Co0.1 composite microspheres exhibit a specific capacity of 171 mAhg−1 at a current density of 0.08 Ag−1 (except for the first cycle). After 10 cycles, the specific capacity of V2O5-Co0.1 composite microspheres did not change, it exhibited better cycling stability. When the current density is increased to 0.1 Ag−1 and 0.3 Ag−1, 241 mAhg−1 and 200 mAhg−1 specific capacities are obtained. Although the initial specific capacity of pure V2O5 microspheres was higher than that of V2O5-Co0.1, its capacity retention after cycling was 86%, which was lower than that of V2O5-Co0.1. The reason for the enhanced stability of V2O5-Co0.1 composite microspheres is that Co ions are fixed between the layered structures of V2O5, which increases the stability of the V2O5 structure.Graphical Abstract: