Nickel sulfide cathode in combination with an ionic liquid-based electrolyte for rechargeable lithium batteries

Jia Zhao Wang, Shu Lei Chou, Sau Yen Chew, Jia Zeng Sun, Maria Forsyth, Douglas R. MacFarlane, Hua Kun Liu

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66 Citations (Scopus)

Abstract

Nickel sulfides, pure Ni3S2 and a mixture of Ni7S6-NiS, were synthesized through a solvothermal process. The nickel sulfide powders were characterized by X-ray diffraction, scanning electron microscopy, and electrochemical testing. The results showed that the capacity of NiS-Ni7S6 is much higher than that of Ni3S2, when used as the cathode in a lithium cell with an organic solvent-based electrolyte, l M lithium bis(trifluoromethanesulfonyl)amide (LiNTf2) in poly(ethylene glycol) dimethyl ether 500. The NiS-Ni7S6 electrodes were also tested with an ionic liquid electrolyte consisting of 1 M LiNTf2 in N-methyl-N-propyl pyrrolidinium bis(trifluoromethanesulfonyl)amide ([C3mpyr][NTf2]) to compare with organic-solvent based electrolytes. The results revealed that the ionic liquid is a useful solvent for use with this cathode material.

Original languageEnglish
Pages (from-to)2379-2382
Number of pages4
JournalSolid State Ionics
Volume179
Issue number40
DOIs
Publication statusPublished - 31 Dec 2008

Keywords

  • Ionic liquid-based electrolyte
  • Lithium rechargeable batteries
  • Nickel sulfides
  • Solvothermal synthesis

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