Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (6): 1816.doi: 10.7503/cjcu20200896

• Physical Chemistry • Previous Articles     Next Articles

Construction and Zn Storage Performance of Three Dimensional Porous MnOx@In2O3 Cubes

FAN Xiaoyong(), WU Yan, SUN Ruibo, GOU Lei, LI Donglin()   

  1. School of Materials Science and Engineering,Chang’an University,Xi’an 710061,China
  • Received:2020-12-26 Online:2021-06-10 Published:2021-06-08
  • Contact: FAN Xiaoyong,LI Donglin E-mail:xyfan@chd.edu.cn;dlli@chd.edu.cn
  • Supported by:
    the International Scientific and Technological Cooperation Projects of Shaanxi Province, China(2020KW?024)

Abstract:

Mn-based oxides have been widely researched as the cathode of Zn-ion batteries due to their high capacity and low-cost. However, their phase transformation, dissolution of Mn and unstable electrode/electrolyte interphase during cycling cause poor cycle lifespan, especially poor lifespan at low current densities and high discharge depth. In this work, three-dimensional(3D) porous MnOx cubes were prepared and then a In2O3 layer was coated on their surface to gain 3D porous MnOx@In2O3 cubes. The rich pores with size about 10 nm are beneficial to the rapid transport of H+ and Zn2+, In2O3 coating layer is beneficial to suppressing the dissolution of Mn and phase transformation of MnOx electrodes and stabilize the electrode/electrolyte interphase during cycling. The 3D porous MnOx@In2O3 electrodes deliver high capacity of 260 mA·h/g after 400 stable cycles at a small current density of 0.3 A/g, which is much better than most of reports. Besides, it also delivers high capacity of 81 mA·h/g after 4000 stable cycles at 1.8 A/g, high capacity of 73.4 mA·h/g even at high current density of 6.0 A/g. The Galvanostatic intermittent titration technique(GITT) and CV results reveal 3D porous MnOx@In2O3 electrode has lower electrochemical polarization and large diffusion coefficient than those of 3D porous MnOx electrode. The electrochemical impedance spectra results demonstrate 3D porous MnOx@In2O3 electrode has more stable electrode/electrolyte interphase than that of 3D porous MnOx electrode. The SEM images of 3D porous MnOx@In2O3 electrode suffered 2000 cycles show a little In2O3 still dispersing on the MnOx surface, which ensures the structure stability and stable cyclability.

Key words: Zn-ion battery, Cathode, Mn-based oxide, Three dimensional porous, In2O3 Coating layer

CLC Number: 

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