Sol-gel synthesis of multiwalled carbon nanotube-LiMn2O4 nanocomposites as cathode materials for Li-ion batteries |
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Authors: | Xian-Ming Liu Zheng-Dong Huang Peng-Cheng Ma Ganesh Kumar Vedam Jang-Kyo Kim |
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Affiliation: | a Department of Mechanical Engineering, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, PR China b Department of Electronic and Computer Engineering, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, PR China c Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea d College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang City, 471022 Henan, PR China |
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Abstract: | This study reports the development of multiwalled carbon nanotube (MWCNT)-LiMn2O4 nanocomposites by a facile sol-gel method. The elemental compositions, surface morphologies and structures of the nanocomposites are characterized with a view to their use as cathode materials for Li-ion batteries. The results indicate that the nanocomposite consists of LiMn2O4 nanoparticles containing undamaged MWCNTs. The nanocomposites show high cycle performance with a remarkable capacity retention of 99% after 20 cycles, compared with LiMn2O4 nanoparticles with a 9% loss of the initial capacity after 20 cycles. Measurements of a.c. impedance show that the charge-transfer resistance of the nanocomposites is much lower than that of spinel LiMn2O4. A cyclic voltammetry study further confirms higher reversibility of the nanocomposites compared with LiMn2O4 particles. The enhanced electrochemical performance of the nanocomposites is attributed to the formation of conductive networks by MWCNTs that act as intra-electrode wires, thereby facilitating charge-transfer among the spinel LiMn2O4 particles. |
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Keywords: | Li-ion battery Nanocomposite Multiwalled carbon nanotube Cyclic performance Discharge capacity |
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