期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 528, 期 -, 页码 121-125出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.03.042
关键词
Two-step molten-salt; Composites; Li[Li0.11Mn0.57Ni0.32]O-2; High-voltage; Lithium-ion batteries
资金
- NSFC [91022018, 21025104]
- National Basic Research Program of China [2011CB935904]
- FJPYT [2009HZ0004-1]
- FJIRSM [SZD08002-3, SZD09003-1, 2010KL002]
Composite Li[Li0.11Mn0.57Ni0.32]O-2 was initially prepared by a two-step molten-salt method for uses as high-voltage cathode of lithium-ion batteries. This new synthetic route involves a low-temperature melting process of sodium acetate and a second high-temperature melting process of sodium carbonate, which is proved to be advantageous in simplifying the preparation processes of stabilizing oxidation states of framework metal ions at Mn4+ and Ni2+. In particular, the melting temperature of 900 degrees C for the second process is found to be crucial for the formation of the composite. The resultant composite crystallized in a layered structure, and was constructed by particles with dimensions about 100-150 nm. As a consequence of the stabilization of oxidation state and the formation of layered structure, the composite, when acting as a high-voltage cathode for lithium-ion batteries, exhibited a reproducible electro-chemical performance as featured by an initial discharge capacity of 250.8 mAh g(-1) between 4.6 V and 2.0 V and a high cycling ability with little capacity decay at a current density of 20 mAg(-1). (C) 2012 Elsevier B.V. All rights reserved.
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