Influence of Mn content on the morphology and improved electrochemical properties of Mn3O4|MnOarbon nanofiber as anode material for lithium batteries

• Published in: Journal of power sources 2012-10, Vol.216, p.353-362
• Main Authors: Yang, Gang, Li, Yuhong, Ji, Hongmei, Wang, Haiying, Gao, Po, Wang, Lu, Liu, Haidong, Pinto, Joao, Jiang, Xuefan
• Format: Article
• Language: English
• Subjects: Carbon; Carbonization; Discharge; Lithium batteries; Manganese; Morphology; Nanomaterials; Nanostructure
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2012.05.092

A series of composites manganese oxide/carbon with one-dimensional structure are synthesized using electrospinning. The phase composition, morphology and electrochemical performance of MnOx/carbon are studied, which affected by the manganese concentration in precursor and subsequent carbonization conditions. The manufacture of MnOx/carbon is composed of two steps including thermal stabilization (at 250 degree C in air) and carbonization (at 700 degree C in nitrogen). The main functional groups of samples are well identified by FT-IR spectra. The sample Mn33_3h with the lowest manganese content presents the construction structure which amorphous and/or nanosized MnOx with smaller crystal size are grown and enwrapped in carbon fiber during carbonization. Mn33_3h presents the initial charge and discharge capacities of 1054.1 and 665.6 mAh ga1, and the discharge capacity at the 50th cycle remains 99.7% of that at the 2nd cycle. Beside the well rate capability at the range of current densities from 20 to 1000 mA ga1, Mn33_3h presents very good recovery ability after high rate cycling at 1000 mA ga1. The advantages of this composite structure as well as its high capacity make manganese oxide a very attractive candidate as an anode material for the next generation of rechargeable lithium ion batteries.