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Article

Non-Flammable Dual-Salt Deep Eutectic Electrolyte for High-Voltage Lithium Metal Battery

by
Wanbao Wu
1,†,
Qing Li
2,†,
Miaomiao Cao
1,
Deping Li
3,
Jingyu Lu
4,
Mingyu Li
1 and
Jiaheng Zhang
1,*
1
Research Centre of Printed Flexible Electronics, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
2
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
3
State Key Laboratory of Advanced Welding and Joining, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
4
School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Crystals 2022, 12(9), 1290; https://doi.org/10.3390/cryst12091290
Submission received: 23 August 2022 / Revised: 10 September 2022 / Accepted: 11 September 2022 / Published: 13 September 2022
(This article belongs to the Special Issue Advanced Technologies in Lithium-Ion Batteries)
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Abstract

The application of high voltage cathode electrode materials is an effective way to increase the energy density of batteries. However, the development and design of a stable electrolyte at high voltages needs to be further addressed. Herein, we developed a non-flammable dual-salt deep eutectic solvent (DES) as a safe electrolyte containing LiTFSI, LiDFOB, and succinonitrile in different molar ratios. This non-flammable DES provides high ionic conductivity (4.23 mS cm−1) at 25 °C, high Li+ transference number (0.75), and wide electrochemical stability (>5.5 V). When using the designed DES electrolytes in high voltage LiCoO2||Li cells, superior electrochemical performance was achieved at cut-off voltages of 3.0–4.45 V and 3.0–4.6 V, even at a high current density of 2 C. This work offers an in-depth understanding of the critical role of dual-salts in DES and provides an approach to designing safe electrolytes for high voltage LiCoO2||Li cells.
Keywords: non-flammable; high Li+ transference number; deep eutectic solvent; high voltage LCO; lithium metal battery non-flammable; high Li+ transference number; deep eutectic solvent; high voltage LCO; lithium metal battery

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MDPI and ACS Style

Wu, W.; Li, Q.; Cao, M.; Li, D.; Lu, J.; Li, M.; Zhang, J. Non-Flammable Dual-Salt Deep Eutectic Electrolyte for High-Voltage Lithium Metal Battery. Crystals 2022, 12, 1290. https://doi.org/10.3390/cryst12091290

AMA Style

Wu W, Li Q, Cao M, Li D, Lu J, Li M, Zhang J. Non-Flammable Dual-Salt Deep Eutectic Electrolyte for High-Voltage Lithium Metal Battery. Crystals. 2022; 12(9):1290. https://doi.org/10.3390/cryst12091290

Chicago/Turabian Style

Wu, Wanbao, Qing Li, Miaomiao Cao, Deping Li, Jingyu Lu, Mingyu Li, and Jiaheng Zhang. 2022. "Non-Flammable Dual-Salt Deep Eutectic Electrolyte for High-Voltage Lithium Metal Battery" Crystals 12, no. 9: 1290. https://doi.org/10.3390/cryst12091290

APA Style

Wu, W., Li, Q., Cao, M., Li, D., Lu, J., Li, M., & Zhang, J. (2022). Non-Flammable Dual-Salt Deep Eutectic Electrolyte for High-Voltage Lithium Metal Battery. Crystals, 12(9), 1290. https://doi.org/10.3390/cryst12091290

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