pH对溶胶-凝胶法制备的锂离子电池正极材料磷酸铁锂的形貌及电化学性能的影响

摘要

采用溶胶-凝胶法制备了锂离子电池正极材料LiFePO4；探讨了pH对磷酸铁锂的形貌及电化学性能的影响.结果表明,随着pH的升高,LiFePO4的粒径减小,粒径分布变窄,电化学性能提高.在不同pH下制备的LiFePO4材料以0.2C的倍率放电,首次放电比容量分别为126.8 mAh/g、132.4 mAh/g、145.6 mAh/g.%Lithium-ion battery cathode material LiFePO4was synthesized by sol-gel method. The effect of pH value on the morphology and electrochemical performance of LiFePO4 was investigated. Results indicated that as the pH value increased, the particle size of LiFePO4 was reduced, its particle size distribution was narrowed, and its electrochemical performance was improved. When LiFePO4 samples obtained under different pH values were discharged at a rate of 0.2 C, they had an initial specific discharge capacity of 126.8 mAh/g, 132.4 mAh/g, and 145.6 mAh/g, respectively.