Electrochemical deposition of Li2S2/Li2S in aprotic Li–S batteries--颗粒学报PARTICUOLOGY

Yao, Z., Fan, X., & Kong, L. (2024). Electrochemical deposition of Li2S2/Li2S in aprotic Li–S batteries. Particuology, 90, 516-521. https://doi.org/10.1016/j.partic.2024.01.011

Electrochemical deposition of Li₂S₂/Li₂S in aprotic Li–S batteries

Zhifeng Yao^a *, Xiaozhong Fan ^b, Long Kong^b *

a School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China
b Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi'an 710129, China

10.1016/j.partic.2024.01.011

Volume 90, July 2024, Pages 516-521

Received 26 December 2023, Revised 22 January 2024, Accepted 23 January 2024, Available online 2 February 2024, Version of Record 23 February 2024.

E-mail: yaozf@xauat.edu.cn; iamlkong@nwpu.edu.cn

Highlights

• Mechanism of Li₂S deposition in macroscopic and microscopic scale is summarized.

• Polysulfide solubility and solvation in regulating the deposition models are underscored.

• Process, model, and characterization of Li₂S deposition are discussed.

• General directions of developing long-life and high-rate Li–S batteries are proposed.

Abstract

Lithium–sulfur (Li–S) batteries stand out the energy storage systems because of extremely high energy density (2600 W h Kg⁻¹) and low-cost sulfur cathode. Unfortunately, the sluggish deposition from liquid Li polysulfides (LiPSs) to solid Li₂S leads to mild power density and short cycle life. Understanding and regulating Li₂S₂/Li₂S deposition are conceived to be importance to deliver second-plateau capacity in acceptable kinetics, which has the potential to operation Li–S batteries under electrolyte-lean conditions. This perspective aims to summarize the proposed models that can describe the nucleation and propagation of three-dimensional Li₂S₂/Li₂S, as well as affords critical views how electrolyte dictates LiPS conversion from liquid to solid. It hopes to encourage necessary scaffold strategies and electrolyte formulations to further improve energy density and life span of Li–S batteries.

Graphical abstract

Keywords

Lithium–sulfur batteries; Electrolyte; Li₂S precipitation; Characterization

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