Improvement of capacity and cycling performance of spinel LiMn₂O₄ cathode materials with TiO₂-B nanobelts

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• 作者：Jiayan Zhang ; Jianxing Shen ; Tailin Wang ; Changbao Wei ; Yuan Ma ; Chaofeng Zhu ; Yuanzheng Yue
• 关键词：LiMn2O4 ; TiO2-B nanobelts ; Modification ; Cathode ; Lithium battery
• 刊名：Electrochimica Acta
• 出版年：30 November, 2013
• 年：2013
• 卷：111
• 期：Complete
• 页码：691-697
• 全文大小：2400 K

文摘

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^鈭? 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.