材料科学
电化学
锂(药物)
复合数
X射线光电子能谱
衍射
氧化物
复合材料
碳酸丙烯酯
化学工程
分析化学(期刊)
电极
冶金
化学
物理化学
有机化学
医学
物理
光学
工程类
内分泌学
作者
Naoya Kumagai,S. Tanifuji,Kazuo Tanno
标识
DOI:10.1016/0378-7753(91)80115-e
摘要
MnO2V2O5 composites formed by heating mixtures of MnO2 and NH4VO3 under various conditions are evaluated as positive material for secondary lithium batteries. The charge/discharge characteristics of the composites are dependent on the type of MnO2 used, the heat-treatment temperature, the discharge rate, and the depth-of-discharge. A composite formed by heating a mixture of EMD and NH4VO3 (V/Mn atom ratio = 1.0) at 350 °C for 4 h in air exhibits the best cycling characteristics, and gives a discharge capacity of 250–350 A h/kg-oxide over 10 cycles at a current density of 0.20 mA cm−2 at 25 °C in 1 M LiClO4propylene carbonate. X-ray diffraction, X-ray photoelectron spectroscopic, and SEM studies of the composite reveal that the charge/discharge characteristics may be determined by the structure of a surface layer formed on the MnO2 particles.
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