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High‐Performance Lithium–Sulfur Batteries Based on Ionic‐Liquid Electrolytes with Bis(fluorolsufonyl)imide Anions and Sulfur‐Encapsulated Highly Disordered Activated Carbon
Author(s) -
Salitra Gregory,
Markevich Elena,
Rosenman Ariel,
Talyosef Yosef,
Aurbach Doron,
Garsuch Arnd
Publication year - 2014
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201402126
Subject(s) - imide , ionic liquid , electrolyte , sulfur , lithium (medication) , inorganic chemistry , carbon fibers , activated carbon , chemistry , materials science , electrode , composite number , polymer chemistry , organic chemistry , catalysis , composite material , medicine , adsorption , endocrinology
Composite sulfur–carbon electrodes were prepared by encapsulating sulfur into the micropores of two types of activated carbons, nano‐sized carbon BP2000 and micrometer‐sized carbon. The galvanostatic cycling performance of the obtained electrodes was studied in 0.5 M lithium bis(trifluoromethylsulfonyl)imide (Li TFSI) in 1‐methyl‐1‐butylpyrrolidinium TFSI (BMP TFSI), 0.5 M Li TFSI in 1‐methyl‐1‐propylpyrrolidinium bis(fluorosufonyl)imide (MPP FSI), and 0.5 M Li bis(fluorosulfonyl)imide (FSI) in MPP FSI ionic‐liquid (IL) electrolyte solutions. It is shown that the performance of Li–S cells is achieved by matching the IL anion, the morphology and structure of the carbon matrices, and the sulfur loading. High‐performance of Li–S cells, with composite Li–S cathodes prepared with micrometer‐sized activated carbon in IL electrolyte with FSI anions, are demonstrated at 60 °C. After 48 cycles, the discharge capacity of the cells approaches a value of 1235 mAhg −1 with acycling efficiency of about 100 %.