烧结温度对LiNi_(0.8)Co_(0.2)O_2电化学性能的影响

Effects of sintering temperature on electrochemical performance of LiNi_(0.8)Co_(0.2)O_2

采用共沉淀法合成正极材料LiNi0．8Co0．2O2，通过TG、XRD、循环伏安和充放电测试考察烧结温度对材料的影响。LiNi0．8Co0．2O2的结构和性能对烧结温度敏感，在空气气氛下第一、二段焙烧温度分别为700℃、750℃的产物，具有良好的α—NaFeO2层状结构，以0．2C在2．7～4．3V循环，首次放电比容量为152．2mAh／g，第20次循环的容量保持率为86．5％。

Cathode material LiNi0.8Co0.2O2 was prepared by co-precipitation process. The effects of sintering temperature to the material were investigated by T G,XRD,cyclic vohammetry and charge/discharge tests. The structure and performance of LiNi0.8Co0.2O2 were sensitive to sintering temperature, the product had fine α-NaFeO2 layered structure when pre-sintered at 700 ℃ and siutered at 750 ℃ in air atmosphere. When cycled at 0.2 C in 2.7 - 4.3 V,its initial specific discharge capacity was 152.2 mAh/g, the capacity retention ratio was 86.5% in the 20th cycle.