1,2-丙二醇对锂离子电池正极材料LiFePO_4性能的影响

采用1,2-丙二醇作为表面活性剂,在水热反应中合成正极材料LiFePO4。用XRD、SEM、粒径分布测试和恒电流充放电方法,分别研究了1,2-丙二醇对LiFePO4的结构、形貌、粒径和电化学性能的影响。结果表明：加入适量的丙二醇不改变LiFePO4的橄榄石结构,但可使材料的结晶粒度变小,粒径分布变得均匀;当丙二醇加入量为10 mL时,得到的LiFePO4平均粒径d（0.5）=1.128μm,粒径分布范围为0.316~6.607μm;该材料在0.2C倍率下的首次放电比容量为144 mAh/g,循环性能良好。

Effect of 1,2-propanediol on Performance of Li-Ion Battery Cathode Materials LiFePO4

LiFePO4 cathode material had been synthesized by using 1,2-propanediol as a surfactant in hydrothermal reaction.Effects of structures,morphologies,particle siz and electrochemical performance of LiFePO4 were investigated by XRD,SEM,particle size distribution and constant current charge-discharge test.The results indicate that the olivine structure of the LiFePO4 has not changed by adding proper propanediol,but the material has smaller particle size,and distribution of particle size turns uniform.After adding 10 mL propanediol,the average particle size of LiFePO4 is 1.128 μm,and the particle size distribution ranges from 0.316 to 6.607 μm;The 0.2 C initial specific discharge capacity of the material was 144 mAh/g,and showed better cycle performance.