柠檬酸含量对LiFePO_4/C复合正极材料形貌及电化学性能的影响(英文)  

Effects of Citric Acid Content on the Morphology and Electrochemical Performance of LiFePO_4/C Composite Cathode Materials

作　　者：云强[1,2] 周园[1] 申月[1] 海春喜[1] 李翔[1,2] 张丽娟[1,2] 

机构地区：[1]中国科学院青海盐湖研究所盐湖资源与化学重点实验室,西宁810008 [2]中国科学院大学,北京100049

出　　处：《人工晶体学报》2015年第5期1176-1182,共7页Journal of Synthetic Crystals

基　　金：National High Technology Research and Development Program of China(863)(2013AA110100);National Key Basic Research Program of China(973)(2014CB660806);"West Light"Talents Training Program of Chinese Academy of Sciences(Y412041007);Science and Technology Project of Xining City in 2014(2014-6-24)

摘　　要：采用水热-高温煅烧法制备了具有不同形貌的LiFePO4/C复合材料,探讨了柠檬酸含量对其形貌和电化学性能的影响。结果表明,柠檬酸的添加对LiFePO4/C复合材料的形貌具有显著的影响。通过添加柠檬酸调控LiFePO4/C复合材料的形貌,可以极大地改善LiFePO4/C复合材料的电化学性能。当柠檬酸与LiFePO4的摩尔比为1∶2时,LiFePO4/C复合材料呈纳米片状,颗粒粒径最小,比表面积最大,在0.1 C和5 C时放电比容量为160.3mA·h·g-1和130.9 mA·h·g-1。The LiFePO4/ C composites with different morphology were prepared by a combination of hydrothermal method and calcination process,and the influences of citric acid content on their morphology and electrochemical performances were investigated. The results indicate that the addition of citric acid has a significant effect on the morphology of the LiFePO4/ C composites. Controlling the morphology of LiFePO4/ C composites by adding citric acid can greatly improve the electrochemical performance of the LiFePO4/ C composites. When the molar ratio of citric acid and LiFePO4 is 1∶ 2,the LiFePO4/ C composites are nano-sheets,and have the minimum particles size and the maximum specific surface area. Their discharge capacities are 160. 3 mA ·h·g- 1at 0. 1 C and 130. 9 mA ·h·g- 1at 5 C.

关 键 词：LIFEPO4/C 柠檬酸 水热法 

分 类 号：TM912.9[电气工程—电力电子与电力传动]