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Citation: LIU Yaliu, YUAN Zhongzhi, LIU Liling. Preparation and Electrochemical Characteristics of Manganese Dioxide/graphene Composite Paper Electrode[J]. Chinese Journal of Applied Chemistry, ;2015, 32(7): 843-848. doi: 10.11944/j.issn.1000-0518.2015.07.140404 shu

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

1.
School of Chemistry and Environment, South China Normal University, Guangzhou 51006, China

Corresponding author: YUAN Zhongzhi,
Received Date: 29 November 2014
Available Online: 6 January 2015

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 at380℃.The discharge capacity of MnO₂ in the composite can reach 269 m A·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.
- lithium battery,
- graphene,
- manganese dioxide,
- flexible electrode
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