Synthesis and electrochemical study of CoNi2S4 as a novel cathode material in a primary Li thermal battery

Kyriakos Giagloglou, Julia L. Payne, Christina Crouch, Richard Gover, Paul A. Connor, John T. S. Irvine

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12 Citations (Scopus)
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Abstract

In this work CoNi2S4 was investigated as a candidate cathode material for Li thermal batteries. The CoNi2S4 was synthesized by a solid state reaction at 550◦C in a sealed quartz tube. Neutron powder diffraction was utilized to confirm normal spinel structure up to 200◦C, however, there was cation disorder above this temperature. The electrochemical properties of the batteries were investigated at 500◦C by galvanostatic discharge to elucidate the mechanism and the products NiS, Co3S4 and Co9S8 of the discharge mechanism were confirmed using powder X-ray diffraction. CoNi2S4 exhibits two voltage plateaus vs Li13Si4 at 500◦C, one at 1.75 V and the second at 1.50 V. CoNi2S4 has an overall capacity of 318 mA h g−1 from OCV 2.58 V to 1.25 V vs Li13Si4 which is comparable to that of the well-known metal disulfides
Original languageEnglish
Pages (from-to)A2159-A2163
JournalJournal of The Electrochemical Society
Volume164
Issue number9
DOIs
Publication statusPublished - 25 Jul 2017

Keywords

  • Cathode
  • CoNi2S4
  • Discharge at high temperature
  • Li thermal battery
  • Solid state reaction

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