Improvement of Capacity and Cycling Performance of Spinel LiMn2O4 Cathode Materials with TiO2-B Nanobelts

J.Y. Zhang, J.X. Shen, T.L. Wang, C.B. Wei, Y. Ma, C.F. Zhu, Yuanzheng Yue

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Abstract

The spinel LiMn2O4 was modified with TiO2-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 h g−1 and improved cycling stability. After 50 cycles, the 0, 0.5, 1.0, 2.0 and 3.0 wt.% TiO2-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.
Original languageEnglish
JournalElectrochimica Acta
Volume111
Pages (from-to)691-697
Number of pages7
ISSN0013-4686
DOIs
Publication statusPublished - 2013

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