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

作　　者：Hualin Ye Yanguang Li 

机构地区：[1]Institute of Functional Nano&Soft Materials(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices,Soochow University,Suzhou 215123,China [2]Macao Institute of Materials Science and Engineering,Macao University of Science and Technology,Taipa 999078,Macao SAR,China

出　　处：《Nano Research Energy》2022年第1期125-133,共9页纳米能源研究（英文）

基　　金：The authors acknowledge the support from the National Natural Science Foundation of China(Nos.U2002213 and 51972219);the Science and Technology Development Fund Macao SAR(No.0077/2021/A2),the Collaborative Innovation Center of Suzhou Nano Science and Technology,the 111 Project,and the Joint International Research Laboratory of Carbon-based Functional Materials and Devices.

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.

关 键 词：lithium−sulfur batteries lean electrolyte highly solvating electrolytes sparingly solvating electrolytes 

分 类 号：TM92[电气工程—电力电子与电力传动]