Research on electrolytes for Li-S soft packing batteries

doi:10.12028/j.issn.2095-4239.2019.0182

Abstract

Abstract:

Lithium-sulfur batteries have attracted considerable attention due to their high energy density. Their battery performance is closely related to the sulfur loading, sulfur content of the cathode, and amount of electrolyte. The complexity of the lithium-sulfur battery systems causes data distortion with coin cells. Literature reports on the performance evaluation of soft-packed batteries are rare. Six ether-based electrolytes were studied by linear sweep voltammetry and galvanostatic charge-discharge methods along with the physicochemical parameters, conductivity, and viscosity. The electrolyte lithium salts were lithium bis（trifluoromethanesulfonyl）imide （LiTFSI）, lithium hexafluorophosphate （LiPF₆）, and lithium tetrafluoroborate （LiBF₄）. The mixed solvent volume ratios of 1,2-dimethoxyethane （DME） to 1, 3-dioxane ring （DOL） were 1∶1 and 2∶1. The effects of six electrolytes on the first charge-discharge cycle, median discharge voltage, cycling performance, and charge-discharge efficiency were analyzed using an electrolyte/sulfur ratio of 3.5∶1 with 1.8 A·h lithium-sulfur soft-packed batteries. The results denoted that LiPF₆ was suitable for lithium-sulfur batteries as well as the conventional LiTFSI and mixed solvents in case of DME∶DOL = 2∶1, exhibiting better discharging capacity and a more effective cycling performance. The results based on Li-S soft-packed batteries are of high practical value.

Key words: Li-S soft packing batteries, electrolytes, lithium hexafluorophosphate

CLC Number:

TM 911

LIAO Hongying, WANG Weikun, MENG Rong, JIN Zhaoqing, WANG Anbang. Research on electrolytes for Li-S soft packing batteries[J]. Energy Storage Science and Technology, 2020, 9(1): 82-87.

Figures/Tables 6

Table 1

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电解液编号	溶剂体系 DME∶DOL（体积比）	锂盐	添加剂LiNO₃/mol·L^-1	密度/g·cm^-3	电导率/mS·cm^-1	黏度η/mPa·s
1号	1∶1	0.6 mol/L LiTFSI	0.4	1.0636	8.60	1.125
2号	2∶1	0.6 mol/L LiTFSI	0.4	1.0376	9.08	1.096
3号	1∶1	0.6 mol/L LiPF₆	0.4	1.0218	6.91	1.159
4号	2∶1	0.6 mol/L LiPF₆	0.4	1.0183	10.13	1.135
5号	1∶1	0.6 mol/L LiBF₄	0.4	1.0150	2.25	0.972
6号	2∶1	0.6 mol/L LiBF₄	0.4	0.9835	2.40	0.953

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