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.

sodium-ion

stability

degradation

electrolytes

batteries

Författare

Kasper Westman

Chalmers, Fysik, Kondenserade materiens fysik

Romain Dugas

College 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

Centre national de la recherche scientifique (CNRS)

Université de Picardie Jules Verne

Mathieu Morcrette

Université de Picardie Jules Verne

Centre national de la recherche scientifique (CNRS)

Enrique Irisarri

Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)

A. Ponrouch

Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)

M. R. Palacin

Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)

Centre national de la recherche scientifique (CNRS)

Jean-Marie Tarascon

College 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

2574-0962 (ISSN)

Vol. 1 6 2671-2680

Na-Ion bAttery Demonstration for Electric Storage (NAIADES)

Europeiska kommissionen (Horisont 2020), 2015-01-01 -- 2018-12-31.

Nästa generation batterier för hybrid- och elfordon

Energimyndigheten, 2013-12-01 -- 2017-12-31.

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Energi

Materialvetenskap

Ämneskategorier

Fysik

Kemi

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Chalmers materialanalyslaboratorium

DOI

10.1021/acsaem.8b00360

Mer information

Senast uppdaterat

2019-06-24