Effect of Conductive Agents on Electrochemical Performances of Li3V2(PO4)3/C Cathode Material for Lithium Ion Batteries
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摘要: 研究了导电剂种类和导电剂含量对磷酸钒锂电化学性能的影响。以Li3V2（PO4）3为正极材料，研究了石墨烯、乙炔黑和Super P Li三种导电剂对磷酸钒锂电化学性能的影响。恒电流充放电和电化学阻抗测试结果表明，不同的导电剂对电极的电化学性能有显著的影响。以Super P Li为导电剂的磷酸钒锂正极材料表现出最高的放电比容量和最优异的倍率性能，交流阻抗值小。在此基础上探究了Super P Li含量对磷酸钒锂电化学性能的影响，结果表明添加质量分数10% Super P Li的电池具有较小的阻抗和较高的放电比容量、循环性能和倍率性能。Abstract: 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.
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