尖晶石
电化学
锂(药物)
钴
衍射
材料科学
相(物质)
结晶学
X射线晶体学
原位
化学工程
化学
电极
物理化学
冶金
光学
医学
物理
有机化学
工程类
内分泌学
作者
Yongchun Kan,Yuan Hu,Yang Ren,Javier Bareño,Ira Bloom,Yang‐Kook Sun,Khalil Amine,Zonghai Chen
标识
DOI:10.1016/j.jpowsour.2014.07.178
摘要
In situ high-energy X-ray diffraction was carried out to investigate the structural transformation of lithium cobalt oxides during the solid-state synthesis. Two allotropic phases were observed during the synthesis process; Li2Co2O4 with a spinel structure was formed within the temperature window between 450 °C and 650 °C, beyond which Li2Co2O4 was converted to its hexagonal counterpart, layered LiCoO2, through a cation exchange between Li and Co. In electrochemical tests, the Li2Co2O4 was estimated to have a very low reversible capacity, ∼20 mAh g−1, and a high initial irreversible capacity loss of about 80 mAh g−1. An interfacial phase between layered LiCoO2 domain and spinel Li2Co2O4 domain was also identified by ex situ high-resolution X-ray diffraction.
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