The preparation of ZnMn2O4/Mn2O3/CNT composite cathode material and its application in Aqueous Zinc-ion Batteries
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    Abstract:

    Manganese based compounds with high capacity, high energy density and high operating voltage are the preferred cathode materials in the commercial application of Aqueous Zinc-ion Batteries (AZIBs). However, the low conductivity, manganese dissolution, effect of electrostatic repulsion and poor structural stability of the materials seriously hinder their large-scale application. Carbon nanotubes (CNT) coated ZnMn2O4/Mn2O3 (ZMO/MO) composites were successfully synthesized via a facile surfactant-assisted solvothermal method, and the effects of CNT coating amount on the electrochemical performance and kinetic process of the materials were investigated. The structure and morphology of the materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Compared with pure ZMO/MO, the CNT coated cathode has better cycle stability and higher rate performance at 0.1 A g-1 current density. The kinetics characteristics of the electrode were investigated by cyclic voltammetry and electrochemical impedance. The diffusion rate of Zn2 was increased by Biphasic composites, and the charge transfer was improved by CNT coating.

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History
  • Received:September 13,2020
  • Revised:October 26,2020
  • Adopted:October 27,2020
  • Online: March 01,2021
  • Published:
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