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High-Fluorinated Electrolytes for Li–S Batteries

Journal Article · · Advanced Energy Materials
 [1];  [2];  [3];  [3];  [3];  [3];  [3];  [3];  [3];  [3]
  1. University of Maryland, College Park, MD (United States); Nanjing University of Aeronautics and Astronautics (China); University of Maryland
  2. Nanjing University of Aeronautics and Astronautics (China)
  3. University of Maryland, College Park, MD (United States)
Rechargeable Li–S batteries are regarded as one of the most promising next-generation energy-storage systems. However, the inevitable formation of Li dendrites and the shuttle effect of lithium polysulfides significantly weakens electrochemical performance, preventing its practical application. Herein, a new class of localized high-concentration electrolyte (LHCE) enabled by adding inert fluoroalkyl ether of 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether into highly-concentrated electrolytes (HCE) lithium bis(fluorosulfonyl) imide/dimethoxyether (DME) system is reported to suppress Li dendrite formation and minimize the solubility of the high-order polysulfides in electrolytes, thus reducing the amount of electrolyte in cells. Such a unique LHCE can achieve a high coulombic efficiency of Li plating/stripping up to 99.3% and completely suppressing the shuttling effect, thus maintaining a S cathode capacity of 775 mAh g-1 for 150 cycles with a lean electrolyte of 4.56 g A-1 h-1. The LHCE reduces the solubility of lithium polysulfides, allowing the Li/S cell to achieve super performance in a lean electrolyte. This conception of using inert diluents in a highly concentrated electrolyte can accelerate commercialization of Li–S battery technology.
Research Organization:
University of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0008200; EE0008202
OSTI ID:
1614093
Alternate ID(s):
OSTI ID: 1497239
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 16 Vol. 9; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (6)