摘要
采用XRD、SEM和电化学方法研究了用不同锂盐(CH3COOLi·2H2O、LiCl、LiOH)合成LiFePO4材料对其结构、形貌及电化学性能的影响。结果表明以碱性LiOH为锂源和有CTAB为添加剂的条件下,所合成的LiFePO4材料具有单一物相,其放电比容量较高。在0.1C下放电容量为153.8mAh/g,在0.1C和0.2C下,其循环25周后容量仍保持在140mAh/g,在1C条件下经过80次充放电循环后,其比容量保持率为80%。
The effect of different lithium sources and different amounts of CTAB additives as inducer on the LiFePO4 material crystal structure, morphology and electrochemical properties were studied by XRD, SEM and elec- trochemical method. The results showed that the LiFePO4 material synthesized under the conditions of the lithium source in alkaline and a certain amount of CTAB has simple pure olive-type phase and higher specific capacity. Initial discharge capacity of the material reached 153.8 mAh/g at 0. 1C. The specific capacity was 140 mAh/g at 25＇h cycle and remained 80% after 80 times at 1C rate.
