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A halogen-free and flame-retardant sodium electrolyte compatible with hard carbon anodes
Authors:
Lars Olow Simon
Colbin
(Uppsala University)
,
Ronnie
Mogensen
(Uppsala University)
,
Alexander
Buckel
(Uppsala University)
,
Yong‐lei
Wang
(Stockholm University)
,
Andrew J.
Naylor
(Uppsala University)
,
Jolla
Kullgren
(Uppsala University)
,
Reza
Younesi
(Uppsala University)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Advanced Materials Interfaces
State:
Published (Approved)
Published:
October 2021
Diamond Proposal Number(s):
26551

Abstract: For sodium-ion batteries, two pressing issues concerning electrolytes are flammability and compatibility with hard carbon anode materials. Non-flammable electrolytes that are sufficiently stable against hard carbon have—to the authors’ knowledge—previously only been obtained by either the use of high salt concentrations or additives. Herein, the authors present a simple, fluorine-free, and flame-retardant electrolyte which is compatible with hard carbon: 0.38 m sodium bis(oxalato)borate (NaBOB) in triethyl phosphate (TEP). A variety of techniques are employed to characterize the physical properties of the electrolyte, and to evaluate the electrochemical performance in full-cell sodium-ion batteries. The results reveal that the conductivity is sufficient for battery operation, no significant self-discharge occurs, and a satisfactory passivation is enabled by the electrolyte. In fact, a mean discharge capacity of 107 ± 4 mAh g−1 is achieved at the 1005th cycle, using Prussian white cathodes and hard carbon anodes. Hence, the studied electrolyte is a promising candidate for use in sodium-ion batteries.
Journal Keywords: NaBOB; non-flammable electrolytes; organophosphate; sodium bis(oxalato)borate; sodium-ion batteries; triethyl phosphate (TEP)
Diamond Keywords: Batteries; Sodium-ion
Subject Areas:
Materials,
Chemistry,
Energy
Instruments:
I09-Surface and Interface Structural Analysis
Added On:
25/10/2021 11:54
Documents:
admi.202101135.pdf
Discipline Tags:
Surfaces
Energy Storage
Energy
Physics
Physical Chemistry
Energy Materials
Chemistry
Materials Science
Technical Tags:
Spectroscopy
X-ray Photoelectron Spectroscopy (XPS)