Nanosized LiMyMn2-yO4 (M = Cr, Co and Ni) spinels synthesized by a sucrose-aided combustion method -: Structural characterization and electrochemical properties

被引:52
作者
Amarilla, J. M. [1 ]
Rojas, R. M. [1 ]
Pico, F. [1 ]
Pascual, L. [1 ]
Petrov, K. [2 ]
Kovacheva, D. [2 ]
Lazarraga, M. G. [1 ]
Lejona, I. [1 ]
Rojo, J. M. [1 ]
机构
[1] CSIC, Inst Ciencia Mat, Madrid 28049, Spain
[2] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria
关键词
lithium battery; cathode material; spinel; 4 V and 5 V electrodes; LiMn2O4; LiNi0.5Mn1.5O4;
D O I
10.1016/j.jpowsour.2007.06.056
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
Spinels of composition LiMyMn2-yO4, M = Cr3+, Co3+, or Ni2+, Y = 0.1 and 1 for the Cr and Co dopants, Y=0.05 and 0.5 for the Ni sample, have been synthesized by a sucrose-aided combustion method. The samples as prepared require of an additional thermal treatment at 700 degrees C, I h to get stoichiometric single-phase spinels. The samples consist of aggregated particles of small size (45-50 nm) as deduced from transmission electron microscopy and X-ray powder diffraction. The electrochemical behaviour of the six spinels as cathodes in lithium cells has been analysed at 5 and 4V under high current, 1 C rate. At 5 V the discharge capacity of LiNi0.5Mn1.5O4 is higher than the one shown by LiCrMnO4 and LiCoMnO4, and it shows an elevated cyclability, i.e. capacity retention of 85.3% after 100 cycles. At 4 V the discharge capacity is similar for LiNi0.05Mn1.95O4, LiCr0.1Mn1.9O4 and LiCo0.1Mn1.9O4, and all the three spinels show similar and very high cyclability, i.e. capacity retention >90% after 100 cycles. The spinels preserve their starting capacity up to currents as high as 2 C rate. The nanometric size of the samples explains the high rate capability of the synthesized spinels. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:1212 / 1217
页数:6
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