固相法制备快充高电压LiCoO_2

Preparing quick charge and high voltage LiCoO_2 by solid-state method

用低温固相法合成层状钴酸锂（LiCoO2）,研究复合改性材料在4.45 V高电压下快速充电的循环性能,用感应耦合等离子体（ICP）、XRD、SEM、粒度和比表面积分析及充放电测试,对材料进行分析。相对常规高电压LiCoO2,在900℃下保温12 h合成的复合改性LiCoO2粒径更小,仅为9.169μm,呈团聚态。在3.004.45 V循环,该材料的0.2 C比容量为180.6 m Ah/g;以1.0 C充放电和3.0 C充电、1.0 C放电,循环300次的容量保持率分别为94.2%和91.7%。

Layered lithium cobalt oxides （LiCoO2 ） was prepared under lower temperature by solid-state method. The cycle performance of the compound-doped samples were studied under high voltage of 4. 45 V and quick charge. The materials were analyzed by inductively coupled plasma（ ICP）, XRD, SEM,particle size and specific surface area analyses and charge-discharge tests. Relative to common high voltage LiCoO2 ,the compound-doped LiCoO2 sintered at 900 0C for 12 h had smaller particle size about 9. 169 μm and reunion state. The specific capacity of the material was 180. 6 mAh/g when cycled in 3.00 -4. 45 V（0. 2 C） ,the capacity retention rates after 300 cycles with 1.0 C charge-discharge and 3.0 C charge,1.0 C discharge were 94. 2% and 91.7% ,respectively.