Low temperature performance of copper/nickel modified LiMn2O4 spinels

被引：28
作者：
Ein-Eli, Y
Urian, RC
Wen, W
Mukerjee, S
机构：
[1] Technion Israel Inst Technol, Dept Mat Engn, IL-32000 Haifa, Israel
[2] Northeastern Univ, Dept Chem & Biol Chem, Boston, MA 02115 USA
来源：
ELECTROCHIMICA ACTA | 2005年 / 50卷 / 09期
关键词：
Cu-Ni modified Mn spinels; low temperature behavior; in situ XRD; structural modifications;
D O I：
10.1016/j.electacta.2004.09.002
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
This study presents an evaluation of structural changes resulting from cycling modified copper/nickel LiMn2O4 spinels at 263 K. ln situ synchrotron XRD shows that cycling LiMn2O4 at 263 K resulted in the formation of mixed cubic and tetragonal phases with a consequent lower capacity. The differential capacitance profile normally exhibiting two peaks at 298 K is modified, showing only one oxidation peak at 263 K in the 4 V region. The changes observed are attributed to interactions between Jahn-Teller active Mn3+ species and Li+ ions. These changes are not observed once copper/nickel modified spinels are being evaluated, because of the decrease in Mn3+ population. All the observed changes are fully reversible once the material is cycled back at 298 K. (C) 2004 Elsevier Ltd. All rights reserved.
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页码：1931 / 1937
页数：7
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