Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (3): 794.doi: 10.7503/cjcu20200693

• Physical Chemistry • Previous Articles     Next Articles

In⁃situ Growth NiS/nickel Foam as Cathode Current Collector of Magnesium-sulfur Batteries

HUANG Yan1, ZHANG Shuxin1, NULI Yanna2(), WANG Baofeng1, YANG Jun2, WANG Jiulin2   

  1. 1.College of Environmental and Chemical Engineering,Shanghai University of Electric Power,Shanghai 200090,China
    2.School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
  • Received:2020-09-17 Online:2021-03-10 Published:2021-03-08
  • Contact: NULI Yanna E-mail:nlyn@sjtu.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21975159)

Abstract:

Nickel foam in situ grown NiS and Cu foil were respectively used as the cathode current collectors of magnesium-sulfur(Mg-S) batteries with S@MC cathode and(PhMgCl)2-AlCl3+LiCl/THF hybrid electrolyte. The constant-current discharge-charge cycling and rate performances of the Mg-S batteries were compared and the reason of different performance was analyzed. When using copper foil collector, the cracks were observed on the cathode and obvious uneven distribution with slightly higher sulfur content on magnesium anode. In the case of NNF, the morphology of the cathode can be basically maintained because the pore structure of nickel foam buffers the volume changes of sulfur active material. Importantly, NiS in situ growing on NNF can accele-rate the conversion of polysulfide intermediates, reduce the formation of polysulfides and suppress the shuttle, and hardly interfere the electrochemical reaction on the magnesium anode, resulting in more uniform magnesium surface. As a result, the Mg-S battery with NNF cathode current collector exhibits significantly improved cycle stability and rate performance.

Key words: Magnesium-sulfur battery, Current collector, Ni foam, NiS, Electrolyte

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