Recent progress in fluorinated electrolytes for improving the performance of Li–S batteries

作     者：Xiwen Wang Yuqing Tan Guohong Shen Shiguo Zhang Xiwen Wang;Yuqing Tan;Guohong Shen;Shiguo Zhang

作者机构：College of Materials Science and EngineeringState Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan UniversityChangsha 410082HunanChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2020年第29卷第2期

页      面：149-170页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 

基　　金：the National Natural Science Foundation of China(Grant nos.51772089 and 21872046) the Youth 1000 Talent Program of China(Grant no.S2017JJJCQN0149) the Fundamental Research Funds for the Central Universities the Outstanding Youth Scientist Foundation of Hunan Province(Grant no.S2019JJQNJJ0361) Natural Science Foundation of Hunan Province(Grant no.S2019JJQNJJ0361) 

主　　题：Lithium–sulfur batteries Electrolyte Fluorinated solvents Shuttle effect SEI forming mechanism 

摘      要：Lithium–sulfur(Li–S) batteries represent a beyond Li-ion technology with low cost and high theoretical energy density and should fulfill the ever-growing requirements of electric vehicles and stationary energy storage systems. However, the sulfur-based conversion reaction in conventional liquid electrolytes results in issues like the so-called shuttle effect of polysulfides and lithium dendrite growth, which deteriorate the electrochemical performance and safety of Li–S batteries. Optimization of conventional organic solvents(including ether and carbonate) by fluorination to form fluorinated electrolytes is a promising strategy for the practical application of Li–S batteries. The fluorinated electrolytes, owing to the high electronegativity of fluorine, possesses attractive physicochemical properties, including low melting point,high flash point, and low solubility of lithium polysulfide, and can form a compact and stable solid electrolyte interphase(SEI) with the lithium metal anode. Herein, we review recent advancements in the development of fluorinated electrolytes for use in Li–S batteries. The effect of solvent molecular structure on the performance of Li–S batteries and the formation mechanism of SEI on the cathode and anode sides are analyzed and discussed in detail. The remaining challenges and future perspectives of fluorinated electrolytes for Li–S batteries are also presented.