Copper Selenide as a New Cathode Material based on Displacement Reaction for Rechargeable Magnesium Batteries

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56 Citations (Scopus)

Abstract

Rechargeable performance was realized in a Mg-battery using a β-Cu2Se cathode. The average specific capacity was approximately 120 mAh/g for the first 35 cycles at room temperature, which was comparable with that of Chevrel phase as a prototype cathode material for Mg-batteries. The specific capacity was improved up to about 230 mAh/g by downsizing β-Cu2Se crystals, the short side length of which is about ∼100 nm. The displacement reaction, in which the inserted Mg ions induce the displacement and extrusion of Cu ions from Se-sublattices, was suggested as the plausible mechanism for the reversible electrochemical reaction in the battery cell cathode. This mechanism was supposed from the structural relationship between β-Cu2Se and MgSe.

Original languageEnglish
Pages (from-to)655-661
Number of pages7
JournalElectrochimica Acta
Volume210
DOIs
Publication statusPublished - 2016 Aug 20

Keywords

  • cathode
  • displacement reaction
  • magnesium battery
  • multi-valent ion battery
  • selenide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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