Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (7): 843-848.DOI: 10.11944/j.issn.1000-0518.2015.07.140404

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Preparation and Electrochemical Characteristics of Manganese Dioxide/graphene Composite Paper Electrode

LIU Yaliu, YUAN Zhongzhi*, LIU Liling   

  1. School of Chemistry and Environment,South China Normal University,Guangzhou 51006,China
  • Received:2014-11-19 Accepted:2015-04-01 Published:2015-06-30 Online:2015-06-30
  • Contact: Zhongzhi YUAN
  • Supported by:
     

Abstract:

The flexible MnO2/graphene composite paper electrode for lithium batteries was prepared by electro-deposition of MnO2, via the oxidation of Mn2+ solution, on the graphene film. The paper electrode structure, appearance and electrochemical performances were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), cyclic voltammetry (CV) and galvanostatic discharging. The results show that spherical MnO2 particles are homogeneously deposited on the graphene flakes to form a MnO2/graphene composite paper electrode with the thickness of 45 μm. The crystal structure of MnO2 in the composite changes from γ-MnO2 to a mixed structure of γ/β-MnO2 after calcination at 380 ℃. The discharge capacity of MnO2 in the composite can reach 269 mA·h/g at 0.1C at room temperature. The structure of graphene is not damaged at the high calcination temperature. The good flexibility, low impendence and excellent electrochemical performance of the MnO2/graphene paper electrode are profitable for flexible Li/MnO2 batteries.

 

Key words: lithium battery, graphene, manganese dioxide, flexible electrode

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