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Synthesis and Electrochemical Performance of Carbon Nanotubes/Cobalt Manganese Oxides Composite Materials for Lithium Air Batteries

Author(s): ZHANG Zhi-An, ZHOU Geng, PENG Bin, LU Hai, JIA Ming, LAI Yan-Qing, LI Jie

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 9;
Start page: 949;
Date: 2013;
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Keywords: lithium air batteries; manganese oxide; cobalt oxide; cobalt manganese oxide; electrocatalyst; polarization

Carbon nanotubes/cobalt manganese oxides composites with different Co/Mn ratios were prepared by precipitation method. The as-prepared products were characterized by XRD, SEM, TEM, BET, FT-IR, discharge performance, charge performance and cycle profiles. The results show that the products are CNTs/Co3O4 and CNTs/Mn3O4 when Co/Mn ratios are 4:0 and 0:4, respectively, while CNTs/(Co, Mn)(Co, Mn)2O4 is obtained at Co/Mn ratios of 3:1, 2:2 and 1:3. The products show high dispersion with oxides attaching to CNTs closely, and CNTs/Mn3O4 has the best morphology performance. With increasing content of Mn, the discharge performance improves. CNTs/Mn3O4 has the highest discharge voltage of 2.92 V. For charge processes, the product with higher content of Co reveals better charge properties. The lowest voltage is about 3.8 V. Meanwhile, the product with Co/Mn ratio of 3:1 has a minor charge-discharge voltage difference(¡÷V) of 1.05 V, which still keeps excellent electrochemical performance after 5 charge-discharge cycles.
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