标题：Study on the enhanced electrochemical performance of LiMn2O4 cathode material at 55 degrees C by the nano Ag-coating
作者：Jiang, Rongyan; Cui, Congying; Ma, Houyi; Ma, Hongfang; Chen, Ting
作者机构：[Jiang, Rongyan; Ma, Hongfang] Shandong Jianzhu Univ, Sch Mat Sci & Engn, Jinan 250101, Peoples R China.; [Cui, Congying; Ma, Houyi] Shandong Univ, 更多
通讯作者地址：[Jiang, RY]Shandong Jianzhu Univ, Sch Mat Sci & Engn, Jinan 250101, Peoples R China.
来源：JOURNAL OF ELECTROANALYTICAL CHEMISTRY
关键词：Ag-coated; Electronic conductivity; Cycling performance; Electrochemical; performance; Dissolution
摘要：In this paper, the nano-sized Ag particles were coated on the surfaces of the spinel LiMn2O4 nanoparticles through a one-step combustion method. It was shown that the rate performance and cycling performance of LiMn2O4 could be effectively improved by the appropriate amount of Ag (5 wt%) not only at room temperature (25 degrees C) but also at high temperature (55 degrees C). This was because the Ag particles dispersed on the surface of LiMn2O4 had dramatically increased its electronic conductivity. Definitely, the electrochemical performance of the Ag-coated LiMn2O4 particles at 55 degrees C was not as excellent as that at 25 degrees C. Besides, the Ag-coated LiMn2O4 displayed much better cycling performance at higher C-rates (2 C and 5 C) at 55 degrees C, compared with that at lower C-rate (0.5 C). This was because Ag was just dispersed rather than being densely coated on the surface of LiMn2O4, so the dissolution of LiMn2O4 at 55 degrees C could not be completely inhibited by Ag. Moreover, the dissolution of LiMn2O4 at 2 C and 5 C at 55 degrees C was much weaker than that at 0.5 degrees C, caused by the faster transformation between Mn3+ and Me. As a result, the electrochemical performance of LiMn2O4 could be enhanced by the Ag-coating at high temperature. (C) 2015 Elsevier B.V. All rights reserved.