文献类型：期刊文献

英文题名：Structure and Performance of Dual-doped LiMn2O4 Cathode Materials Prepared via Microwave Synthesis Method

作者：Zhang, Huang[1];Xu, Yunlong[1];Liu, Dong[2];Zhang, Xiusheng[1];Zhao, Chongjun[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Univ Texas Arlington, Dept Mat Sci & Engn, Arlington, TX 76019 USA

年份：2014

卷号：125

起止页码：225

外文期刊名：ELECTROCHIMICA ACTA

收录：;EI(收录号：20140917382661);WOS:【SCI-EXPANDED(收录号:WOS:000335424300028)】；

基金：The work is supported by Shanghai Leading Academic Discipline Project (B502) and Shanghai Key Laboratory Project (08DZ2230500).

语种：英文

外文关键词：LiMn2O4; Dual-doping; Microwave sintering; Mn dissolution; Cycle stability

摘要：A series of LiNi(0.05-x)xMg(x)Mn(1.95)O(4) (0.01 <= x <= 0.04) compounds were synthesized using microwave irradiation as sintering technique. The structures and electrochemical performances of the as-prepared powders were characterized by XRD, SEM, EDS, TEM, electrochemical galvanostatic cycling tests, EIS and XRF. The XRD and Rietveld refinement results indicate that all samples exhibit a single spine structure and dual-doping causes the shrinkage of lattice space. The discharge capacities and cycling performances of LiNi0.03Mg0.02Mn1.95O4 are the best with a low capacity fading over the investigated 30 cycles at elevated temperature (55 degrees C). These results demonstrate that the microwave sintering method and metallic ions co-doping are effective ways to suppress the Mn dissolution from active electrodes at high temperature and high rate for lithium-ion batteries. (C) 2014 Elsevier Ltd. All rights reserved.