期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 156, 期 5, 页码 A349-A355出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3080659
关键词
-
资金
- Region Aquitaine
A one-step synthesis method was used, with LiF or NiF2 as fluorine precursor, to prepare Li-1.1(Ni0.425Mn0.425Co0.15)(0.9)O1.8F0.2 materials. Li-7 and F-19 magic angle spinning NMR analyses revealed the presence of fluorine as LiF at the surface of the Li(Ni0.425Mn0.425Co0.15)O-2 particles, rejecting the formation of fluorine-substituted Li-1.1(Ni0.425Mn0.425Co0.15)(0.9)O1.8F0.2 materials. These results highlighted that change in cell parameters with increasing fluorine content is not by itself proof for effective fluorine substitution for oxygen in layered oxides and that heterogeneity in the transition metal and fluoride-ion distribution at the crystallite scale can be at the origin of these modifications. LiF was shown to be present as small particles in some grain boundaries but not as a continuous layer covering the particles surface. Improved cycling stability was observed for these LiF-coated materials, showing that effective fluorine substitution for oxygen is not required for improvement of the cyclability of these layered oxides; a surface modification can be sufficient and can also have a huge impact. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3080659] 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