Application of Dimethyl Sulfoxide as Solvent of Electrolyte Solution in Rechargeable Lithium Metal Batteries†

doi:10.7503/cjcu20140126

Abstract

Abstract:

Dimethyl sulfoxide(DMSO) was used as the solvent of electrolyte in the rechargeable lithium metal batteries. The lithium deposition morphology and cycling efficiency in DMSO, propylene carbonate(PC) and 1,3-dioxolane(DOL) with lithium hexafluorophosphate(LiPF₆) as the solute and in DMSO with lithium hexafluorophosphate(LiPF₆), lithium tetrafluoroborate(LiBF₄), lithium perchlorate(LiClO₄) or lithium bis(trifluoromethane sulfonimide)(LiTFSI)] as the solute respectively were investigated and compared. The resuts show that Li surface deposited in the DMSO solution was smooth and uniform and the lithium cycling efficiency in the DMSO solvent was higher than that in PC solvent in the first ten cyclings.

Key words: Dimethyl sulfoxide(DMSO), Metal lithium, Surface morphology, Cycling efficiency

CLC Number:

O646

TrendMD:

YUAN Zhenshan, XU Qiang, SANG Lin, DING Fei. Application of Dimethyl Sulfoxide as Solvent of Electrolyte Solution in Rechargeable Lithium Metal Batteries^†[J]. Chem. J. Chinese Universities, 2014, 35(9): 1994.

Figures/Tables 7

Fig.1 Low(A1—C1) and high(A2—C2) magnification SEM images of lithium surface deposited from 1.0 mol/L LiPF6-based electrolyte DMSO(A1, A2), PC(B1, B2) and DOL(C1, C2)

Fig.2 Low(A1—C1) and high(A2—C2) magnification SEM images of lithium surface deposited in DMSO-based electrolytes containing 1 mol/L LiBF4(A1, A2), LiClO4(B1, B2) and LiTFSI(C1, C2)

Fig.3 Cycling efficiency curve of 1 mol/L LiPF6 in DMSO, PC and DOL

Fig.4 Cycling efficiency curves of 1 mol/L LiPF6(a), LiBF4(b), LiClO4(c) and LiTFSI(d) in DMSO

Fig.5 Cole-Cole plots for the lithium electrode in DMSO, PC and DOL containing 1.0 mol/L LiPF6

Fig.6 Cole-Cole plots for the lithium electrode in 1 mol/L LiBF4, LiClO4, LiTFSI and LiPF6

Fig.7 Cyclic voltammetry curve of lithium electrode in DMSO electrolyte Scan rate: 5 mV/s.

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