中热固相法Li_(1+x)V_3O_(8-y)F_y正极材料的制备及性能

Preparation and electrochemical properties of Li_(1+x)V_3O_(8-y)F_y synthesized by solid state reaction method at moderate-heating temperature

以Li2CO3和V2O5为原料,用中热固相法制备了掺杂不同氟离子含量的锂离子电池正极材料Li1+xV3O8-yFy,采用XRD衍射对其结构进行表征,并通过充放电测试、循环伏安及电导率测试对其性能进行了研究.测试结果表明,中热固相法制得的Li1+xV3O8-yFy产品较纯,没有杂质相存在;当y=0.1时产品的电化学循环性能最好,首次放电比容量达252.08 mAh/g,以0.2c倍率循环25次之后比容量仍保持在210.93 mAh/g,容量保持率达92.72%.

F——doped lithium vanadium oxides Li1＋xV3O8-yFy was synthesized by a solid state reaction at moderate-heating temperature with Li2CO3 and V2O5 as raw materials.Crystal structures were characterized by XRD and electrochemical properties were studied by charge-discharge performance test,cyclic voltammetry test,and conductance test.The XRD results indicate that the products are pure without any impurities.Li1＋xV3O8-yFy（y=0.1） shows the best electrochemical cyclability.The first discharge specific capacity is 252.08mAh/g,and the attractive specific capacity of 210.93 mAh/g is obtained after 25 cycles at 0.2c.