Copper Selenide as a New Cathode Material based on Displacement Reaction for Rechargeable Magnesium Batteries. (20th August 2016)

• Record Type: Journal Article
• Authors: Tashiro, Yuta; Taniguchi, Kouji; Miyasaka, Hitoshi
• Is Part Of: Electrochimica acta. Volume 210(2016)
• Page Start: 655
• Page End: 661
• Publication Date: 2016-08-20
• Subjects: magnesium battery -- cathode -- displacement reaction -- selenide -- multi-valent ion battery; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.05.202
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Rechargeable performance was realized in a Mg-battery using a β-Cu2 Se 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-Cu2 Se 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-Cu2 Se and MgSe.