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  

Effect of pH on the morphology and electrochemical performance of LiFePO_4 as a lithium-ion battery

作　　者：吴肇聪[1] 黄瑞安[1] 周晓玲[1] 戴永年[1] 杨斌[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院-真空冶金国家工程实验室,云南昆明650093

出　　处：《化学研究》2011年第5期78-81,共4页Chemical Research

基　　金：云南省自然科学基金资助项目(2009CD024)

摘　　要：采用溶胶-凝胶法制备了锂离子电池正极材料LiFePO_4;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,LiFePO_4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LiFePO_4材料以0.2C的倍率放电,首次放电比容量分别为126.8mAh/g、132.4mAh/g、145.6mAh/g.Lithium-ion battery cathode material LiFePO_4 was synthesized by sol-gel method.The effect of pH value on the morphology and electrochemical performance of LiFePO_4 was investigated. Results indicated that as the pH value increased,the particle size of LiFePO_4 was reduced, its particle size distribution was narrowed,and its electrochemical performance was improved. When LiFePO_4 samples obtained under different pH values were discharged at a rate of 0.2℃,they had an initial specific discharge capacity of 126.8 mAh/g,132.4 mAh/g,and 145.6 mAh/g,respectively.

关 键 词：pH锂离子电池 正极材料 LIFEPO 形貌 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]