Electrochemical and Structural Properties of xLi2M'O3·(1-x)LiMn0.5Ni0.5O2 Electrodes for Lithium Batteries (M' = Ti, Mn, Zr; 0
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- 作者：Jeom-Soo Kim ; Christopher S. Johnson ; John T. Vaughey ; Michael M. Thackeray ; Stephen A. Hackney ; Wonsub Yoon ; and Clare P. Grey
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：May 18, 2004
- 年：2004
- 卷：16
- 期：10
- 页码：1996 - 2006
- 全文大小：329K
- 年卷期：v.16,no.10(May 18, 2004)
- ISSN：1520-5002
文摘
Electrochemical and structural properties of xLi2M'O3·(1-x)LiMn0.5Ni0.5O2 electrodes (M'= Ti, Mn, Zr; 0 
x 0.3) for lithium batteries are reported. Powder X-ray diffraction, latticeimaging by transmission electron microscopy, and nuclear magnetic resonance spectroscopyprovide evidence that, for M' = Ti and Mn, the Li2M'O3 component is structurally integratedinto the LiMn0.5Ni0.5O2 component to yield "composite" structures with domains having short-range order, rather than true solid solutions in which the cations are uniformly distributedwithin discrete layers. Li2TiO3 and Li2ZrO3 components are electrochemically inactive,whereas electrochemical activity can be induced into the Li2MnO3 component above 4.3 Vvs Li0. When cycled in lithium cells, xLi2MnO3·(1-x)LiMn0.5Ni0.5O2 electrodes with x = 0.3provide capacities in excess of 300 mA·h/g over the range 4.6-1.45 V.
x 0.3) for lithium batteries are reported. Powder X-ray diffraction, latticeimaging by transmission electron microscopy, and nuclear magnetic resonance spectroscopyprovide evidence that, for M' = Ti and Mn, the Li2M'O3 component is structurally integratedinto the LiMn0.5Ni0.5O2 component to yield "composite" structures with domains having short-range order, rather than true solid solutions in which the cations are uniformly distributedwithin discrete layers. Li2TiO3 and Li2ZrO3 components are electrochemically inactive,whereas electrochemical activity can be induced into the Li2MnO3 component above 4.3 Vvs Li0. When cycled in lithium cells, xLi2MnO3·(1-x)LiMn0.5Ni0.5O2 electrodes with x = 0.3provide capacities in excess of 300 mA·h/g over the range 4.6-1.45 V.