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Improved Redox Reaction of Lithium Polysulfides on the Interfacial Boundary of Polar CoC 2 O 4 as a Polysulfide Catenator for a High‐Capacity Lithium‐Sulfur Battery
Author(s) -
Kim Jin Won,
Seo Gyuwon,
Bong Sungyool,
Lee Jaeyoung
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202002140
Subject(s) - overpotential , redox , polysulfide , electrocatalyst , chemistry , inorganic chemistry , lithium (medication) , lithium–sulfur battery , sulfur , x ray photoelectron spectroscopy , electrochemistry , adsorption , cobalt , chemical engineering , organic chemistry , electrode , medicine , engineering , electrolyte , endocrinology
The performance of cobalt oxalate as an electrocatalyst in a lithium‐sulfur battery (LSB) is improved owing to the suitable adsorbent properties of sulfur. The adsorption mechanism is elucidated by UV/Vis spectroscopy and surface analysis through X‐ray photoelectron spectroscopy. Li 2 S 6 is converted into thiosulfate and polythionate by a catenation reaction on the interfacial boundary of CoC 2 O 4 contacted with carbon. Following this, the active polythionate and short‐chained liquid lithium polysulfides (LiPS) bound to the cobalt surface are further reduced as CoC 2 O 4 reduces the overpotential to facilitate the LiPS redox reaction, leading to high specific capacity, lower self‐discharge rate, and stable long‐term cycling performance.