Towards practical lean-electrolyte Li–S batteries: Highly solvating electrolytes or sparingly solvating electrolytes?

被引:29
作者
Ye H. [1 ]
Li Y. [1 ,2 ]
机构
[1] Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou
[2] Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa
来源
Nano Research Energy | 2022年 / 1卷 / 01期
基金
中国国家自然科学基金;
关键词
highly solvating electrolytes; lean electrolyte; lithium−sulfur batteries; sparingly solvating electrolytes;
D O I
10.26599/NRE.2022.9120012
中图分类号
学科分类号
摘要
Lithium–sulfur (Li–S) batteries hold great promise to be the next-generation candidate for high-energy-density secondary batteries but in the prerequisite of using low electrolyte-to-sulfur (E/S) ratios. Highly solvating electrolytes (HSEs) and sparingly solvating electrolytes (SSEs), with opposite nature towards the dissolution of polysulfides, have recently emerged as two effective solutions to decrease the E/S ratio and increase the overall practical energy density of Li–S batteries. HSEs featuring with high polysulfide solvation ability have the potential to reduce the E/S ratio by dissolving more polysulfides with less electrolyte, while SSEs alter the sulfur reaction pathway from a dissolution–precipitation mechanism to a quasi-solid mechanism, thereby independent on the use of electrolyte amount. Both HSEs and SSEs show respective effectiveness in lean-electrolyte Li–S batteries, but encounter different challenges to bring Li–S batteries into practical application. This review aims to present a comparative discussion on their unique features and basic electrochemical reaction mechanisms in practical lean-electrolyte Li–S batteries. Emphasis is focused on the current technical challenges and possible solutions for their future development. © The Author(s) 2022. Published by Tsinghua University Press.
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