Issue 19, 2008

VOx-coated LiMn2O4nanorodclusters for lithium battery cathode materials

Abstract

VOx-coated LiMn2O4 spinel nanorod clusters as a lithium battery cathode material are prepared by mixing OV(CH3H7)3 dissolved in ethanol and LiMn2O4 powder consisting of nanorod clusters and firing this mixture at 700 °C. In the coated spinel, the V atoms are distributed within ∼30 nm of the particle surface without showing any coating layer, indicating the possible formation of a solid solution (LiMn2−xVxO4). The coated nanorod clusters exhibit a comparable rate capability to an uncoated counterpart, showing a discharge capacity of 117 mAh g−1 at a rate of 7 C (= 1400 mA g−1), which corresponds to 89% of the capacity retention ratio at room temperature. Further, the coated cathode exhibits excellent structural stability in storage at 80 °C for 24h; a significantly decreased amount of Mn dissolution (60 ppm) is observed, in contrast to that of an uncoated counterpart (5000 ppm).

Graphical abstract: VOx-coated LiMn2O4 nanorod clusters for lithium battery cathode materials

Article information

Article type
Paper
Submitted
12 Dec 2007
Accepted
04 Mar 2008
First published
20 Mar 2008

J. Mater. Chem., 2008,18, 2257-2261

VOx-coated LiMn2O4 nanorod clusters for lithium battery cathode materials

J. Cho, J. Mater. Chem., 2008, 18, 2257 DOI: 10.1039/B719177D

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