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Title:Spectroscopic insights into the electrochemical mechanism of rechargeable calcium/sulfur batteries
Authors:ID Scafuri, Antonio (Author)
ID Berthelot, Romain (Author)
ID Pirnat, Klemen (Author)
ID Vižintin, Alen (Author)
ID Bitenc, Jan (Author)
ID Aquilanti, Giuliana (Author)
ID Foix, Dominique (Author)
ID Dedryvère, Rémi (Author)
ID Arčon, Iztok (Author)
ID Dominko, Robert (Author)
ID Stievano, Lorenzo (Author)
Files: This document has no files that are freely available to the public. This document may have a physical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Calcium batteries represent a promising alternative to lithium metal systems. The combination of the low redox potential and low cost and the energy-dense calcium anode (2073 mAh/cm3, similar to 2044 mAh/cm3 for Li) with appropriate low-cost cathode materials such as sulfur could produce a game-changing technology in several fields of applications. In this work, we present the reversible activity of a proof-of-concept Ca/S battery at room temperature, characterized by a surprising medium-term cycling stability with low polarization, promoted by the use of a simple positive electrode made of sulfur supported on an activated carbon cloth scaffold, and a state-of-the-art fluorinated alkoxyborate-based electrolyte. Insights into the electrochemical mechanism governing the chemistry of the Ca/S system were obtained for the first time by combining X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. The mechanism implies the formation of different types of soluble polysulfide species during both charge and discharge at room temperature, and the formation of solid CaS at the end of discharge. The reversible electrochemical activity is proven by the reformation of elemental sulfur at the end of the following charge. These promising results open the way to the comprehension of emerging Ca/S systems, which may represent a valid alternative to Mg/S and Li/S batteries.
Keywords:Calcium/Sulfur Batteries EXAFS, XANES
Year of publishing:13
Number of pages:str. 8266-8275
Numbering:#Vol. #32, #no. #19
PID:20.500.12556/RUNG-5892 New window
COBISS.SI-ID:32411907 New window
ISSN on article:0897-4756
DOI:10.1021/acs.chemmater.0c02074 New window
Publication date in RUNG:17.10.2020
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Record is a part of a journal

Title:Chemistry of materials
Shortened title:Chem. mater.
Publisher:The Society
Year of publishing:13
COBISS.SI-ID:6557189 New window

Secondary language

Keywords:elektrokemija, baterije, spektroskopija, žveplo