Cailiao gongcheng (Aug 2020)

Synthesis and electrochemical performance of Mn<sub>2</sub>O<sub>3</sub>/Fe<sub>2</sub>O<sub>3</sub>/few layers graphene/ sulfur cathode for lithium-sulfur batteries

  • WANG Nan,
  • QI Xin,
  • PENG Si-kan,
  • CHEN Xiang,
  • WANG Chen,
  • DAI Sheng-long,
  • YAN Shao-jiu

DOI
https://doi.org/10.11868/j.issn.1001-4381.2019.000246
Journal volume & issue
Vol. 48, no. 8
pp. 110 – 118

Abstract

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Mn2O3/Fe2O3/few layer graphene/sulfur composites were prepared by melted salt method, interlayer catalytic exfoliation, annealing and melt diffusion method in sequence for lithium-sulfur batteries cathode. The three-dimensional conductive network formed by highly conductive few layers graphene provides electron transfer channel, thus promoting the high capacity performance of lithium-sulfur batteries. The metal oxides distributed uniformly on the surface of graphene exhibit strong interaction towards polysulfides, which can restrain the dissolution of polysulfides and shuttle effect and promote the cycling performance of lithium-sulfur batteries. As a result, the Mn2O3/Fe2O3/FLG30/S cathode shows high capacity and cycling performance. The cathode delivers an initial discharging capacity of 886.3 mAh·g-1 with a high capacity retention of 88.1% after 100 cycles at rate of 0.1 C.

Keywords