Polysulfide Shuttle Suppression by Electrolytes with Low-Density for High-Energy Lithium-Sulfur Batteries

被引：68

作者：

Weller, Christine ^{[1
,2
]}

Pampel, Jonas ^{[1
,2
]}

Doerfler, Susanne ^{[2
]}

Althues, Holger ^{[2
]}

Kaskel, Stefan ^{[1
,2
]}

机构：

[1] Tech Univ Dresden, Chair Inorgan Chem 1, Bergstr 66, D-01069 Dresden, Germany

[2] Fraunhofer Inst Mat & Beam Technol, Chem Surface Technol, Winterbergstr 28, D-01277 Dresden, Germany

来源：

ENERGY TECHNOLOGY | 2019年 / 7卷 / 12期

关键词：

batteries; electrolytes; lithium; polysulfide shuttle; sparingly solvating; sulfur; LI-S BATTERIES; SPARINGLY SOLVATING ELECTROLYTES; LIQUID ELECTROLYTE; PERFORMANCE; MECHANISM; CATHODE; REDUCTION; STABILITY; CHEMISTRY; PRODUCTS;

D O I：

10.1002/ente.201900625

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

A low-density electrolyte composition is introduced for lithium-sulfur (Li-S) batteries with intrinsic and effective polysulfide shuttle suppression. Hexyl methyl ether (HME) is used in combination with 1,3-dioxolane (DOL) as a solvent for the Li-S battery electrolyte. The choice of solvent limits the dissolution of polysulfides, leading to successful suppression of the parasitic polysulfide shuttle. Hence, high coulombic efficiencies of 98% can be obtained in coin cells for over 50 cycles. The impact of the specifically adapted electrolyte solvent is studied systematically by varying solvent combinations in order to enable the development of light innovative shuttle suppressing electrolytes. In contrast to concepts relying on hydrofluoro ether dilution, the presented electrolyte features a significantly reduced mass density at 2 m lithium bis(trifluoromethanesulfonylimide) (LiTFSI) conductive salt enabling significant weight reduction on the Li-S prototype cell level, thus, allowing energy densities up to 400 Wh kg(-1).

引用

页数：12

共 67 条

[1] On the Surface Chemical Aspects of Very High Energy Density, Rechargeable Li-Sulfur Batteries [J].