Enhance electrochemical performance of LiFePO4-C nanocomposite with V2O5 addition in lithium-ion battery cathode

Olivine structured LiFePO4 is one of the promising materials of lithium ion battery cathode, in terms of price, safety, rate, and cycle life. In this study, LiFePO4-C was synthesized by spray pyrolysistechnique to apply as lithium ion battery cathode. Spray pyrolysis is a simple, continuous, and easilycontrollable technique for synthesis of nanomaterials. V2O5 powder was also added to cathode to further promote the electrochemical performance towards lithium ion storage. The electrochemical performance was evaluated by galvanostatic charge-discharge, cyclic voltammetry, and electrochemical impedancespectroscopy in a two-electrode cell. The results showed the beneficial role of the addition of V2O5 in terms of improving the specific capacity, rate capability, and cycling stability and lithium ion diffusion rate of the LiFePO4-C-based cathode. The obtained electrochemical performance metrics was as follows: The initial discharge capacity of 154 mAhg-1 at 0.1C and 110 mAhg -1at 100 mAhg-1 rate, and keeping a capacity retention ratio of 93% after 50 cycles.

Keywords:

Electrochemical properties , V2O5 particle , LiFePO4 , Lithium- Ion battery