期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 162, 期 12, 页码 A2259-A2265出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0161512jes
关键词
-
资金
- NASA's Space Power Systems Technology Development Program
- National Aeronautics and Space Administration
Li-rich layered-layered nickel manganese cobalt oxides (LLNMC) of the type Li2MnO3-LiMO2 (M = Mn, Co, Ni) are promising cathode materials due to their higher specific capacities and discharge voltages compared to state of art materials. However, these materials have yet to exhibit adequate cycle life and power characteristics in practical cells, partly due to the instability of electrolytes at these high voltages. Thin coatings of inorganic materials such as Al2O3, AlPO4, and ALF(3) have been shown to minimize these degradation processes, especially on high voltage cathodes. Here, we report the use of a new aluminum borate-based coating material on the LLNMC cathode at high active mass loadings. AlBO3-coated cathodes demonstrate a sevenfold increase in lifetime compared to uncoated material, as well as higher specific discharge energies vs. analogous AlPO4-coated materials. SEM and TEM confirm the thin coatings of amorphous material. Detailed electrochemical studies including Tafel polarization, PITT, and Electrochemical Impedance Spectroscopy (EIS) show that the AlBO3 coating improves the kinetics of electron transfer. (C) The Author(s) 2015. Published by ECS.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据