Comparing the behavior of nano- and microsized particles of LiMn1.5Ni0.5O4 spinel as cathode materials for Li-ion batteries

被引:108
作者
Talyosef, Yosef [1 ]
Markovsky, Boris
Lavi, Ronit
Salitra, Gregory
Aurbach, Doron
Kovacheva, Daniela
Gorova, Mila
Zhecheva, Ekaterina
Stoyanova, Radostina
机构
[1] Bar Ilan Univ, Dept Chem, IL-52900 Ramat Gan, Israel
[2] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria
关键词
D O I
10.1149/1.2736657
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
We report on a rigorous comparative study of nano- and microparticles of LiMn1.5Ni0.5O4 spinel as cathode materials for Li-ion batteries. The stability of these materials in LiPF6/alkyl carbonate solutions in temperatures up to 70 degrees C was explored. Capacity, cycling, rate capabilities, and impedance behavior were also studied. The methods included X-ray diffraction, Raman, X-ray photelectron, Fourier transform infrared, and electron paramagnetic resonance spectroscopies, and electron microscopy, in conjunction with standard electrochemical techniques: voltammetry, chronopotentiometry, and impedance spectroscopy. These materials show an impressive stability in solutions at elevated temperature. The use of nanomaterials was advantageous for obtaining a better rate capability of LiMn1.5Ni0.5O4 electrodes. LiMn1.5Ni0.5O4 particles develop a unique surface chemistry in solutions that passivates and protects them from detrimental interactions with solution species at elevated temperatures. (C) 2007 The Electrochemical Society.
引用
收藏
页码:A682 / A691
页数:10
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