锂离子负极材料VS_(4)的制备与性能表征

Preparation and performance characterization of lithium ion cathode material VS_(4)

为了解决商业化锂离子电池负极材料的理论比容量不足以满足未来市场需求的问题,采用溶剂热法分别以甲醇和乙二醇为反应溶剂制备了高结晶度VS_(4)负极材料,并分析了VS 4负极材料的电化学性能.结果表明:在0.4 A/g电流密度下经过50次循环后,VS 4-甲醇电极的放电比容量约为200 mA·h/g,在0.6 A/g电流密度下经过1000次循环后,VS_(4)-甲醇电极的放电比容量高达280 mA·h/g,因而VS_(4)-甲醇电极具有显著的循环稳定性;当电流密度从1 A/g返回到0.2 A/g时,VS_(4)-甲醇电极的放电比容量可以回升到550 mA·h/g,表明VS_(4)-甲醇电极具有良好的倍率性能.

In order to solve the problem that the theoretical specific capacity of cathode materials for commercial lithium ion batteries is not large enough to meet the demand of future market,a VS_(4)cathode material with high crystallinity was prepared by a solvothermal method through taking methanol and glycol as reaction solvents,reapectively.The electrochemical properties of VS_(4)cathode material were analyzed.The results show that after 50 cycles under a current density of 0.4 A/g,the specific discharge capacity of VS4-methanol electrode is about 200 mA·h/g.Under a high current density of 0.6 A/g,the specific discharge capacity of VS4-methanol electrode reaches 280 mA·h/g after 1000 cycles,showing remarkable cycle stability.When the current density returns from 1 A/g to 0.2 A/g,the specific discharge capacity of VS4-methanol electrode can rise to 550 mA·h/g again,indicating that the VS4-methanol electrode has good multiplying power performance.