不同钴源对合成LiCoO_2性能的影响

Effects of different cobalt sources on the performances of synthesized LiCoO_2

采用液相软化学合成法和高温固相反应法合成了LiCoO2 正极材料 ,并考察了不同钴源、添加剂氨水和乙醇对LiCoO2 正极材料的物理性质和电化学性能的影响 ,采用XRD、BET、SEM、TEM、粒度分布和电化学性能测试对合成LiCoO2 正极材料进行了表征。结果表明 ,不同钴源、添加剂氨水和乙醇对合成LiCoO2 正极材料的物性和电化学性能都有较明显的影响。液相软化学法合成LiCoO2 正极材料时 ,Co(NO3 ) 2 ·6H2 O是最好的钴源 ;高温固相反应法合成LiCoO2 正极材料时 ,Co3 O4(UM )

The LiCoO_2 cathode material was synthesized by liquid-phase soft-chemistry process and solid state reaction at higher temperature with different cobalt sources respectively, and characterized by XRD, BET, SEM, TEM, laser particle size distribution and electrochemical testing. The effects of different cobalt sources, aqueous ammonia and ethanol additives on the physical and electrochemical properties of LiCoO_2 cathode materials were investigated. The results have demonstrated that the different cobalt sources, aqueous ammonia and ethanol additives have remarkable influences on the physical and electrochemical properties of (LiCoO_2) cathode material. When liquid-phase soft-chemistry process is used to synthesize LiCoO_2 cathode material, the Co(NO_3)_2·6H_2O is the best cobalt source. Whereas Co_3O_4 of Union Mineral Corporation is the most excellent cobalt source when high-temperature solid state reaction method is used to prepare LiCoO_2 cathode materials. The optimal sintering temperature range is 800～820?℃ when liquid-phase soft-chemistry process is used to synthesize LiCoO_2 cathode materials. Liquid-phase soft-chemistry process is superior to high-temperature solid state reaction method when LiCoO_2 cathode materials is prepared.