期刊
ELECTROCHIMICA ACTA
卷 111, 期 -, 页码 691-697出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.08.063
关键词
LiMn2O4; TiO2-B nanobelts; Modification; Cathode; Lithium battery
资金
- Science and Technology Foundation of Jinan, China [201102056]
The spinel LiMn2O4 was modified with Tio(2)-B nanobelts to improve its specific capacity and cycling performance. TiO2-B/LiMn2O4 composites were fabricated by a facile liquid phase mixing method. The morphology and structure of the samples were characterized by means of X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results show that TiO2-B nanobelts are uniformly distributed in LiMn2O4 particle. Compared with bare LiMn2O4, TiO2-B/LiMn2O4 composite cathode material shows enhanced specific capacity of 129 mA hg(-1) and improved cycling stability. After 50 cycles, the 0, 0.5, 1.0, 2.0 and 3.0 wt.% Tio(2)-B nanobelts modified LiMn2O4 exhibited the capacity retention of 86.1, 92.6, 93.7, 94.5 and 92.8%, respectively. The improvement of the electrochemical performance is attributed to suppression of Mn2+ dissolution, higher structural stability of the composite and rapid Li+ diffusion resulting from the open lattice channels and unique one-dimensional structure of TiO2-B nanobelts. (C) 2013 Elsevier Ltd. All rights reserved.
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