Ce-doped V2O5 microspheres with improved electrochemical performance for high-power rechargeable lithium ion batteries

Abstract

The development of high performance cathode materials is of importance for the widespread application of lithium-ion batteries in advanced energy storage devices. V2O5 is an attractive cathode candidate for lithium ion batteries owing to its high capacity as well as abundant source and low cost. In this work, Ce-doped V2O5 microspheres were fabricated by a combine method of one-step solvothermal process and subsequently annealing treatment. The electrochemical performance of V2O5 microspheres was enhanced dramatically by Ce-doping. Ce0.1V2O5 microspheres exhibit a high initial reversible capacity of 280.7 mAhg−1 at 0.5C and an excellent rate capability of 163.1 mAhg−1 at 10C. The discharge capacity of Ce0.1V2O5 microspheres could maintain up to 193.7 mAhg−1 with a capacity retention of about 88.93% even after 200 cycles, displaying a good cycling stability. The improved electrochemical properties of the synthesized Ce-doped V2O5 microspheres can be attributed to the lattice expansion upon Ce ions doping that can enhance the Li+ diffusion coefficient of electrodes. Meanwhile, Ce-doped V2O5 microspheres is constructed with aggregated nanoparticles, which is benefit for superior Li+ transportation and structural stability. The Ce-doped V2O5 microspheres could be utilized as a promising cathode material for lithium-ion batteries.