标题：Study on the enhanced electrochemical performance of LiMn2O4cathode material at 55°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 ] School of Materials Science and Engineering, Shandong Jianzhu University, Jinan; 250101, China;[Chen, Ting ] School of 更多
来源：Journal of Electroanalytical Chemistry
摘要：In this paper, the nano-sized Ag particles were coated on the surfaces of the spinel LiMn2O4nanoparticles through a one-step combustion method. It was shown that the rate performance and cycling performance of LiMn2O4could be effectively improved by the appropriate amount of Ag (5 wt%) not only at room temperature (25°C) but also at high temperature (55°C). This was because the Ag particles dispersed on the surface of LiMn2O4had dramatically increased its electronic conductivity. Definitely, the electrochemical performance of the Ag-coated LiMn2O4particles at 55°C was not as excellent as that at 25°C. Besides, the Ag-coated LiMn2O4displayed much better cycling performance at higher C-rates (2 C and 5 C) at 55°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 LiMn2O4at 55°C could not be completely inhibited by Ag. Moreover, the dissolution of LiMn2O4at 2 C and 5 C at 55°C was much weaker than that at 0.5 C, caused by the faster transformation between Mn3+and Mn4+. As a result, the electrochemical performance of LiMn2O4could be enhanced by the Ag-coating at high temperature.
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