Effect of Conductive Agents on Electrochemical Performances of Li₃V₂(PO₄)₃/C Cathode Material for Lithium Ion Batteries

In this paper,the effects of conductive agents on the electrochemical properties of lithium vanadium phosphate were investigated.The influences of graphene,acetylene black and Super P Li on the electrochemical properties of lithium vanadium phosphate were studied using Li₃V₂(PO₄)₃ as the cathode material.The results of galvanostatic charge/discharge and electrochemical impedance tests show that different conductive agents have a significant effect on the electrochemical properties of the electrodes.The lithium vanadium phosphate cathode material using Super P Li as the conductive agent exhibits the highest discharge specific capacity and the most excellent rate performance,with a small AC impedance value.On basis of the above results,the effect of the content of Super P Li on the electrochemical performances of lithium vanadium phosphate was further investigated.The results show that the battery using 10% Super P Li as conductive agent has a smaller internal resistance and a higher discharge specific capacity,a superior cycle performance and rate performance.