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

Wu，Wanbao1; Li，Qing2; Cao，Miaomiao1; Li，Deping3; Lu，Jingyu4; Li，Mingyu1; Zhang，Jiaheng1

2022-09-01

10.3390/cryst12091290

Crystals   Impact Factor & Quartile

2073-4352

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) 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 LiCoO||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 LiCoO||Li cells.

deep eutectic solvent high Li+ transference number high voltage LCO lithium metal battery non-flammable

SCI

English

Others

National Natural Science Foundation of China[21703218];Shenzhen Science and Technology Innovation Program[JCYJ20180507183907224];Shenzhen Science and Technology Innovation Program[KQTD20170809110344233];National Natural Science Foundation of China[U21A20307];

Crystallography ; Materials Science

Crystallography ; Materials Science, Multidisciplinary

WOS:000856333000001

MDPI

2-s2.0-85138597741

Scopus

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

Wu，Wanbao,Li，Qing,Cao，Miaomiao,et al. Non-Flammable Dual-Salt Deep Eutectic Electrolyte for High-Voltage Lithium Metal Battery[J]. Crystals,2022,12(9).

Wu，Wanbao.,Li，Qing.,Cao，Miaomiao.,Li，Deping.,Lu，Jingyu.,...&Zhang，Jiaheng.(2022).Non-Flammable Dual-Salt Deep Eutectic Electrolyte for High-Voltage Lithium Metal Battery.Crystals,12(9).

Wu，Wanbao,et al."Non-Flammable Dual-Salt Deep Eutectic Electrolyte for High-Voltage Lithium Metal Battery".Crystals 12.9(2022).