Lithium-manganese oxide electrodes with layered-spinel composite structures xLi2MnO3•(1-x)Li1+yMn2-yO4 (0<x<1, 0≤y≤0.33) for lithium batteries

被引:180
作者
Johnson, CS
Li, N
Vaughey, JT
Hackney, SA
Thackeray, MM
机构
[1] Argonne Natl Lab, Div Chem Engn, Electrochem Technol Program, Argonne, IL 60439 USA
[2] Michigan Technol Univ, Dept Mat Sci & Engn, Houghton, MI 49931 USA
关键词
lithium batteries; composite electrode; structure; spinet; Li2MnO3;
D O I
10.1016/j.elecom.2005.02.027
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Lithium-manganese oxide electrodes containing structurally integrated domains of layered and spinel phases, represented in two-component notation as xLi(2)MnO(3)(.)(1-x)Li1+yMn2-yO4 (0 < x < 1, 0 <= y <= 0.33), were synthesized and evaluated in lithium cells. During an initial charge to 5 V, lithium and/or lithia (Li2O) are extracted from the spinel and layered components at distinct voltages. When cycled between 5 and 2 V, a rechargeable capacity > 250 mAh/g can be achieved from electrodes prepared at 400 degrees C during the early cycles. The discharge profiles confirm the layered-spinel character of the composite electrodes. The Li2MnO3 Mn(IV) content in the parent structure and the degree to which lithium and lithia are extracted from the electrode during the initial charge can be used to control the average manganese oxidation state at the end of discharge and electrochemical cycling stability. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:528 / 536
页数:9
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