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Vol. 14 (2022)

Electrostatic Interaction Tailored Anion-Rich Solvation Sheath Stabilizing High-Voltage Lithium Metal Batteries

https://doi.org/10.1007/s40820-022-00896-4
Junru Wu
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People’s Republic of China
Ziyao Gao
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People’s Republic of China
Yao Wang
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People’s Republic of China
Xu Yang
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People’s Republic of China
Qi Liu
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People’s Republic of China
Dong Zhou
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People’s Republic of China
Xianshu Wang
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People’s Republic of China
Feiyu Kang
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People’s Republic of China
Baohua Li
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People’s Republic of China

Corresponding Author: Baohua Li

libh@sz.tsinghua.edu.cn

Nano-Micro Letters, Vol. 14 (2022), Article Number: 147

Abstract

Through tailoring interfacial chemistry, electrolyte engineering is a facile yet effective strategy for high-performance lithium (Li) metal batteries, where the solvation structure is critical for interfacial chemistry. Herein, the effect of electrostatic interaction on regulating an anion-rich solvation is firstly proposed. The moderate electrostatic interaction between anion and solvent promotes anion to enter the solvation sheath, inducing stable solid electrolyte interphase with fast Li+ transport kinetics on the anode. This as-designed electrolyte exhibits excellent compatibility with Li metal anode (a Li deposition/stripping Coulombic efficiency of 99.3%) and high-voltage LiCoO2 cathode. Consequently, the 50 μm-thin Li||high-loading LiCoO2 cells achieve significantly improved cycling performance under stringent conditions of high voltage over 4.5 V, lean electrolyte, and wide temperature range (− 20 to 60 °C). This work inspires a groundbreaking strategy to manipulate the solvation structure through regulating the interactions of solvent and anion for high-performance Li metal batteries.


Highlights:


1 The effect of electrostatic interaction on regulating an anion-rich solvation in electrolyte is firstly proposed.
2 The moderate electrostatic interaction between anion and solvent promotes anion-rich solvation sheath, inducing a stable electrolyte|electrode interface with fast Li+ transport kinetics.
3 The outstanding electrochemical performance of 50 μm-thin Li||high-loading LiCoO2 batteries is achieved at high voltage of 4.5 V (even up to 4.6 V), lean electrolyte of 15 μL, and wide temperature range of − 20 to 60 °C.

Keywords

Electrostatic interaction Anion-rich solvation sheath High voltage Lithium metal batteries Wide temperature range
Wu, Junru, Ziyao Gao, Yao Wang, Xu Yang, Qi Liu, Dong Zhou, Xianshu Wang, Feiyu Kang, and Baohua Li. 2022. “Electrostatic Interaction Tailored Anion-Rich Solvation Sheath Stabilizing High-Voltage Lithium Metal Batteries”. Nano-Micro Letters 14 (July):147. https://doi.org/10.1007/s40820-022-00896-4.
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