Diglyme based electrolytes for sodium-ion batteries
Artikel i vetenskaplig tidskrift, 2018
Sodium-ion batteries (SIBs) are currently being considered for large-scale energy storage. Optimization of SIB electrolytes is, however, still largely lacking. Here we exhaustively evaluate NaPF6 in diglyme as an electrolyte of choice, via both physicochemical properties and extensive electrochemical tests including half as well as full cells. Fundamentally, the ionic conductivity is found to be quite comparable to carbonate based electrolytes and to obey the fractional Walden rule with viscosity. We find Na metal to work well as a reference electrode and the electrochemical stability, evaluated potentiostatically for various electrodes and corroborated by DFT calculations, to be satisfactory in the entire voltage range 0-4.4 V. Galvanostatic cycling at C/10 of half and full cells using Na3V2(PO4)(3) (NVP) or Na3V2(PO4)(2)F-3 (NVPF) as cathodes and hard carbon (HC) as anodes indicates rapid capacity fading in cells with HC anodes, possibly originating in a lack of a stable SEI or by trapping of sodium. Aiming to understand this capacity fade further, we conducted a GC/MS analysis to determine electrolyte reduction products and to propose reduction pathways, concluding that oligomer and/or alkoxide formation is possible. Overall, the promising results should warrant further investigations of diglyme based electrolytes for modern SIB development, albeit avoiding HC anodes.
degradation
sodium-ion
batteries
stability
electrolytes
Författare
Kasper Westman
Chalmers, Fysik, Kondenserade materiens fysik
Romain Dugas
Collège de France
Piotr Jankowski
Centre national de la recherche scientifique (CNRS)
Politechnika Warszawska
Chalmers, Fysik, Kondenserade materiens fysik
W. Wieczorek
Centre national de la recherche scientifique (CNRS)
Politechnika Warszawska
G. Gachot
Université de Picardie Jules Verne
Centre national de la recherche scientifique (CNRS)
Mathieu Morcrette
Centre national de la recherche scientifique (CNRS)
Université de Picardie Jules Verne
Enrique Irisarri
Consejo Superior de Investigaciones Científicas (CSIC)
A. Ponrouch
Consejo Superior de Investigaciones Científicas (CSIC)
M. R. Palacin
Centre national de la recherche scientifique (CNRS)
Consejo Superior de Investigaciones Científicas (CSIC)
Jean-Marie Tarascon
Collège de France
Centre national de la recherche scientifique (CNRS)
Patrik Johansson
Centre national de la recherche scientifique (CNRS)
Chalmers, Fysik, Kondenserade materiens fysik
ACS Applied Energy Materials
25740962 (eISSN)
Vol. 1 6 2671-2680Nästa generation batterier för hybrid- och elfordon
Energimyndigheten (37671-1), 2013-12-01 -- 2017-12-31.
Na-Ion bAttery Demonstration for Electric Storage (NAIADES)
Europeiska kommissionen (EU) (EC/H2020/646433), 2015-01-01 -- 2018-12-31.
Drivkrafter
Hållbar utveckling
Styrkeområden
Transport
Energi
Materialvetenskap
Ämneskategorier (SSIF 2011)
Fysik
Annan fysik
Kemi
Infrastruktur
C3SE (-2020, Chalmers Centre for Computational Science and Engineering)
Chalmers materialanalyslaboratorium
DOI
10.1021/acsaem.8b00360