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

doi:10.3724/SP.J.1077.2013.12751

Abstract

Abstract: 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.

Key words: lithium air batteries, manganese oxide, cobalt oxide, cobalt manganese oxide, electrocatalyst, polarization

CLC Number:

TM911

ZHANG Zhi-An, ZHOU Geng, PENG Bin, LU Hai, JIA Ming, LAI Yan-Qing, LI Jie. Synthesis and Electrochemical Performance of Carbon Nanotubes/Cobalt Manganese Oxides Composite Materials for Lithium Air Batteries[J]. Journal of Inorganic Materials, 2013, 28(9): 949-955.

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