Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9783010 | Materials Chemistry and Physics | 2005 | 5 Pages |
Abstract
Spinel LiMn2O4compounds were synthesized by two different methods: spray-drying a mixture of corresponding metal acetates, and traditional solid-state reaction. Phase composition, morphology and particle size of as-prepared materials were characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). Both materials showed well-defined single-phase spinel LiMn2O4. However, the morphology, particle size and distribution exhibited distinct difference. The electrochemical properties of the cathodes were measured in the coin-type cells in a potential range of 3.20-4.35 V versus Li/Li+. Both cyclic voltammogram curves exhibited two pairs of well-defined redox reaction peaks. Initial discharge capacity (at a rate of 1/10C) of the LiMn2O4 synthesized by spray-drying method and solid-state reaction was 123 and 117 mAh gâ1, respectively. At a high rate of 2C, however, the discharge capacity was 107 and 83 mAh gâ1, respectively. And also, cycle life properties of both materials were evaluated.
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Authors
H.M. Wu, J.P. Tu, Y.F. Yuan, Y. Li, X.B. Zhao, G.S. Cao,