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Contribution of Metal Additives on the Electrochemical Process Involving Solid Sulfur and Soluble Lithium Polysulfide in Lithium‐Sulfur Batteries
Author(s) -
Kazahaya Natsuho,
Katayama Yu,
Tsutsumi Hiromori
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202100353
Subject(s) - polysulfide , sulfur , electrochemistry , electrode , lithium (medication) , graphite , inorganic chemistry , materials science , chemical engineering , metal , chemistry , metallurgy , electrolyte , medicine , engineering , endocrinology
Lithium‐sulfur (Li−S) batteries have attracted remarkable attention as next‐generation batteries due to their low cost and high theoretical specific energy density. However, they have encountered several difficulties, including low specific capacity due to the insulating nature of sulfur as well as poor cycle performance. Here, we introduce the Li−S batteries using metal‐deposited graphite as a positive electrode, together with S 8 and Li 2 S 8 as active materials to achieve high initial discharge capacity and improved cyclability. Galvanostatic charge‐discharge measurements for the S 8 ‐impregnated electrode highlight the positive effect of Au additives on the initial discharge capacity (mAh cm −3 ); 48.1 (G)<56.1 (Ag/G)<84.1 (Au/G). Furthermore, improved cyclability was observed for the Au‐decorated electrode with a Li 2 S 8 catholyte system; capacity retention rate was in order of Ag/G