Enhanced high rate performance of LiMn2O4 spinel nanoparticles synthesized by a hard-template route

被引:79
作者
Cabana, J.
Valdes-Solis, T.
Palacin, M. R.
Oro-Sole, J.
Fuertes, A.
Marban, G.
Fuertes, A. B.
机构
[1] CSIC, Inst Nacl Carbon, Oviedo 33011, Spain
[2] CSIC, Inst Ciencia Mat Barcelona, E-08193 Bellaterra, Catalonia, Spain
关键词
lithium batteries; LiMn2O4; lithium manganese spinel; template method; silica gel;
D O I
10.1016/j.jpowsour.2006.12.107
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
A nanosized LiMn2O4 (nano-LiMn2O4) spinel was prepared by a novel route using a porous silica gel as a sacrificial hard template. This material was found to be made up of 8-20 nm nanoparticles with a mean crystallite size of 15 mn. The electrochemical properties of nano-LiMn2O4 were tested in lithium cells at different cycling rates and compared to those of microsized LiMn2O4 (micro-LiMn2O4) obtained by the classical solid state route. Microsized LiMn2O4 is formed by 3-20 mu m agglomerates, the size of each individual particle being approximately 0.20 mu m. The behaviour of nano-LiMn2O4 as a positive electrode improves with increasing current densities (from C/20 to 2C). Moreover, it was found to exhibit a noticeably better performance at high rates (2C), with higher initial capacity values and very good retention (only 2% loss after 30 cycles), with respect to micro-LiMn2O4, almost certainly due to enhanced lithium diffusion in the small particles. (c) 2007 Elsevier B.V All rights reserved.
引用
收藏
页码:492 / 498
页数:7
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