锂离子电池正极材料Fe^(3+)掺杂Li_(1+x)V_3O_8的制备与电化学性能  

The Preparation and Electro-chemical Performance of Fe^(3+)-doped Li_(1+x)V_3O_8 for LIB Cathode Materials

作　　者：史卫良[1] 水淼[2] 舒杰[2] 高珊[2] 冯琳[2] 陈亮亮[2] 

机构地区：[1]国家知识产权局专利局材料工程发明审查部,北京100088 [2]宁波大学材料科学与化学工程学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2012年第3期88-91,126,共5页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：国家科技部973预研计划(2010CB635116);浙江省教育厅科研项目(Y201017390);宁波市自然科学基金(2011A610086);宁波大学王宽诚基金

摘　　要：采用柠檬酸辅助的溶胶-凝胶法制备了Fe3+掺杂Li1.1Fe0.05V2.95O8及对比样品LiV3O8正极材料.使用TG-DTA、XRD、FT-IR等手段表征了正极材料的物理化学特性,并采用EIS、恒电流充放电等手段研究了其电化学性能.结果表明:Fe3+掺杂LiV3O8与对比LiV3O8相比,能在更低的温度下晶化,能在相同温度、相同时间煅烧下保持更小的晶粒度.Li1.1Fe0.05V2.95O8与对比LiV3O8相比,特别是大电流下的放电容量有较大的提高,在75mA.g-1,197 mA.g-1,373 mA.g-1及重新回到75mA.g-1电流下的初始放电容量分别是307mAh.g-1,237 mAh.g-1,162 mAh.g-1和302mAh.g-1.在回复到75 mA.g-1电流后放电容量能非常稳定保持在278.6mAh.g-1左右,并同时给出了初步的理论解释.Fe^3＋-doped lithium vanadium oxide Li1.1Fe0.05V2.95O8 and blank sample LiV3O8 were synthesized by a citric acid assisted sol-gel process. TG-DTA, XRD, FT-IR were used to characterize the physico-chemical properties of the samples. EIS, galvanostatic charge/discharge tests were applied to investigate the electro-chemical performace of the cathode material. The results show that Fe^3＋-doped LiV3O8 crystallizes at lower temperature and reserves smaller crystallinity sintered at the same temperature and for the same time compared with LiV3O8 blank. Li1,1Fe0.05V2.95O8 shows larger discharge capacity, especially that at high discharge current. At the charge/discharge current of 75 mA.g^-1, 197 mA·g^-1, 373 mA.g^-1 and coming back to 75 mA.g^-1, the initial discharge capacity are 307 mAh·g^-1, 237 mAh.g^-1, 162 mAh.g^-1 and 302 mAh·g^-1, respectively. The discharge capacity remains steady at 278.6 mAh.g^-1 when the charge/discharge current comes back to 75 mA·g^-1. A preliminary explanation was also given.

关 键 词：Fe3+掺杂 LI1+XV3O8 溶胶-凝胶 电化学性能 

分 类 号：TM911.1[电气工程—电力电子与电力传动]