Influence of Cobalt Ions on the Electrochemical Properties of Lamellar Manganese Oxides

被引:11
作者
Franger, S. [1 ]
Bach, S. [1 ]
Pereira-Ramos, J. P. [1 ]
Baffier, N. [2 ]
机构
[1] CNRS, Lab Electrochim Catalyse & Synth Organ, UMR 7582, F-94320 Thiais, France
[2] CNRS, Lab Chim Appl Etat Solide, UMR 7574, F-75231 Paris, France
关键词
Oxide; Cobalt; Manganese; Electronic Material; MnO2;
D O I
10.1007/BF02374169
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Evaluation of Co-doping on the electrochemical properties of the sol-gel birnessite and the new lithiated manganese oxide Li(0.45)MnO(2+delta) is reported. For both compounds the synthesis of Co-doped materials via a solution technique is described. We demonstrate the interest of Co-doped structures with the selected content of 0.15 Co per mole of oxide as the optimum composition. In the case of Li(0.45)Mn(1-y)CO(y)O(2+delta), prepared at 300 degrees C a mixture of a lamellar phase and a cubic one is identified while the Co-doped birnessite appears as a single phase. A probable substitution of Mn by Co ions explains the better specific capacity of 185 mAh/g found and the excellent stability observed over 40 cycles in the voltage range 4.2-2.0 V.
引用
收藏
页码:470 / 476
页数:7
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