Enhanced electrochemical stability of Al-doped LiMn2O4 synthesized by a polymer-pyrolysis method |
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Authors: | Lifen Xiao Yanqiang Zhao Yuliang Cao Xinping Ai |
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Affiliation: | a College of Chemistry, HuaZhong Normal University, Wuhan 430079, China b College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China |
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Abstract: | 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 °C for 6 h 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 °C without severe capacity degradation. In particular, the LiAl0.08Mn1.92O4 sample demonstrates excellent capacity retention of 99.3% after 50 cycles at 55 °C, confirming the greatly enhanced electrochemical stability of LiMn2O4 by a small quantity of Al-doping. |
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Keywords: | Spinel LiMn2O4 Al dopant Polymer-pyrolysis Cathode material Lithium ion battery |
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