Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 2, Pages 545-550Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.07.037
Keywords
Spinel LiMn2O4; Al dopant; Polymer-pyrolysis; Cathode material; Lithium ion battery
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Funding
- National 973 Program of China [2002CB211800]
- National Science Foundation of China [50502025]
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LiAlxMn2-xO4 samples (x = 0, 0.02, 0.05, 0.08) were synthesized by a polymer-pyrolysis method. The structure and morphology of the LiAlxMn2-xO4 samples calcined at 800 degrees C for 6h were investigated by powder X-ray diffraction and scanning electron microscopy. The results show that all samples have high crystallinity, regular octahedral morphology and uniform particle size of 100-300 nm. The electrochemical performances were tested by galvanostatic charge-discharge and cyclic voltammetry. The results demonstrate that the Al-doped LiMn2O4 can be very well cycled at an elevated temperature of 55 degrees C without severe capacity degradation. In particular, the LiAl0.08Mn1.92O4 sample demonstrates excellent capacity retention of 99.3% after 50 cycles at 55 degrees C, confirming the greatly enhanced electrochemical stability of LiMn2O4 by a small quantity of Al-doping. (c) 2008 Elsevier Ltd. All rights reserved.
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