A facile route to synthesize nano-MnO/C composites and their application in lithium ion batteries

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• 作者：Si-Rong Li^a ; Yi Sun^a ; ^b ; Si-Yuan Ge^a ; Yu Qiao^a ; Yi-Meng Chen^a ; Ingo Lieberwirth^b ; Yan Yu^a ; Chun-Hua Chen^a ; ^{cchchen@ustc.edu.cn}
• 关键词：Manganese oxide ; Nanoparticle ; Carbon coating ; Alcoholysis ; Lithium ion battery
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：1 June, 2012
• 卷：192
• 期：Complete
• 页码：226-231
• 文件大小：938 K

摘要

Among various anode materials for lithium ion batteries, MnO has attracted a wide-spread attention for its low charge potential (1.0 V vs. Li/Li⁺) and high theoretical capacity (755 mAh g^鈭?). In this paper, we propose a facile way to synthesize carbon-coated nano-MnO powders (MnO/C). Mn₃O₄ nanoparticles with a particle size of about 20 nm are firstly obtained in an alcoholysis process of manganese acetate tetrahydrate with diethylene glycol as the solvent. Then glucose is used as both a carbon source and a reducing agent to prepare MnO/C nanospheres. From the mixtures of Mn₃O₄ and glucose, nano-MnO/C composites with a carbon content up to 18.1 wt%are obtained. X-ray diffraction and transmission electron microscopy are used to analyze the structures of the nano-Mn₃O₄ and nano-MnO/C composites. The electrochemical properties of the nano-MnO/C composites are also characterized. The electrode made from 10.7 wt%-carbon-coated MnO/C shows very stable cycling performance with a high reversible capacity of 939.3 mA h g^鈭? after 30 cycles at 0.1 C. This electrode also shows favorable rate performance with specific capacities of 726.7, 686.8, 633.0 and 587.9 mAh g^鈭? at 1 C, 2 C, 5 C and 10 C, respectively.