Non-flammable fluorobenzene-diluted highly concentrated electrolytes enable high-performance Li-metal and Li-ion batteries

Mengchuang Liu; Ziqi Zeng; Wei Zhong; Zicheng Ge; Longqing Li; Sheng Lei; Qiang Wu; Han Zhang; Shijie Cheng; Jia Xie

doi:10.1016/j.jcis.2022.03.133

Non-flammable fluorobenzene-diluted highly concentrated electrolytes enable high-performance Li-metal and Li-ion batteries

J Colloid Interface Sci. 2022 Aug:619:399-406. doi: 10.1016/j.jcis.2022.03.133. Epub 2022 Mar 29.

Authors

Mengchuang Liu¹, Ziqi Zeng², Wei Zhong³, Zicheng Ge⁴, Longqing Li⁴, Sheng Lei³, Qiang Wu³, Han Zhang³, Shijie Cheng⁴, Jia Xie⁵

Affiliations

¹ State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
² State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. Electronic address: ziqizeng@hust.edu.cn.
³ State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
⁴ State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
⁵ State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. Electronic address: xiejia@hust.edu.cn.

PMID: 35398770
DOI: 10.1016/j.jcis.2022.03.133

Abstract

Lithium-ion batteries with Ni-rich cathode and flammable carbonate electrolytes are breeding severe safety concerns which hinds their application in electric vehicles. Herein, by introducing the fluorobenzene (FB) with low-density and low-cost as a cosolvent and bridge solvents in triethyl phosphate (TEP)-based diluted high-concentration electrolytes (DHCEs) system, we design a non-flammable electrolyte with a special solvation structure containing internal-external flame retardants. This non-flammable electrolyte not only solves successfully the incompatibility problem of TEP-based electrolyte to the Li-metal anode (LMA) and the graphite (Gr) anode, but also ensures the stable cycling of Li||LiNi_0.7Co₀.₁Mn₀.₂O₂ (86% capacity retention after 120 cycles) and Gr|| LiNi_0.7Co₀.₁Mn₀.₂O₂ (75% capacity retention after 200 cycles) full cells. Such design opens up a new window for developing new electrolyte systems and building safer high-energy-density batteries.

Keywords: Fluorobenzene; Lithium-ion batteries; Ni-rich cathode; Non-flammable electrolyte; Safety.