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Title:Role of Cu current collector on electrochemical mechanism of Mg–S battery
Authors:Robba, Ana (Author)
Mežnar, Maja (Author)
Vižintin, Alen (Author)
Bitenc, Jan (Author)
Bobnar, Jernej (Author)
Arčon, Iztok (Author)
Randon-Vitanova, Anna (Author)
Dominko, Robert (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Development of magnesium sulfur battery is accompanied with all known difficulties present in Li–S batteries, however with even more limited choice of electrolytes. In the present work, the influence of current collector on electrochemical mechanism was investigated in light of different reports where improved behavior was ascribed to electrolyte. Notable differences in cycling behavior are reported when Al current collector is replaced by Cu current collector independent of electrolyte. The initial reduction of sulfur follows similar reaction path no mater of current collector, but formation of MgS can be in competition with formation of CuS in the presence of Cu cations. With the subsequent cycling cells prepared from cathodes deposited on Cu current collector show decrease in the voltage and formation of single plateau during cycling. The change corresponds to the involvement of Cu into the reaction and formation of redox couple Mg/CuS as determined by Cu K-edge XANES measurements. Corrosion of Cu foil is identified by SEM and serves as a source of Cu cations for the chemical reaction between Cu and polysulfides. Mg/CuS redox couple shows improved cycling stability, but theoretical energy density is severely reduced due to substitution of S with CuS as cathode active material.
Keywords:Magnesium Sulfur Rechargeable batteries Current collector Copper Corrosion
Year of publishing:2020
Number of pages:7
Numbering:1
COBISS_ID:6773274 Link is opened in a new window
URN:URN:SI:UNG:REP:5B1VB3LB
DOI:10.1016/j.jpowsour.2019.227672 Link is opened in a new window
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
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Title:Journal of power sources
Year of publishing:2020

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