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Rational Design of Co‐NiSe 2 @N‐Doped Carbon Hollow Structure for Enhanced Li–S Battery Performance
Author(s) -
Chen Tianming,
Shang Zhengcong,
Yuan Bo,
Wu Ningxiang,
Abuzar Muhammad,
Yang Jiayi,
Gu Xingxing,
Miao Chunyang,
Ling Min,
Li Sheng
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000302
Subject(s) - cobalt sulfide , faraday efficiency , sulfur , chemical engineering , lithium (medication) , cobalt , chemistry , electrode , carbon fibers , inorganic chemistry , sulfide , battery (electricity) , nickel sulfide , materials science , anode , electrochemistry , composite material , composite number , organic chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
Lithium–sulfur (Li–S) batteries suffer from poor‐cycle stability and low Coulombic efficiency, which are mainly caused by the intrinsic polysulfides shuttle, resulting from not only concentration gradient diffusion but also slow conversion kinetics of polysulfides. Herein, nitrogen‐doped carbon‐coated cobalt nickel selenide (Co‐NiSe 2 @NC) with hollow structures is presented which can simultaneously accommodate the volume expansion of sulfur to maintain the integrity of the electrode, trap the polysulfides, and catalyze the conversion between lithium sulfide and lithium polysulfides to inhibit the polysulfides shuttle. When used to host 70 wt% sulfur, the resulted Co‐NiSe 2 @NC‐S composites electrode delivers a high initial discharge capacity of 930.4 mAh g −1 at 0.5 C, and after 200 cycles, a reversible discharge capacity of 544.6 mAh g −1 can still be maintained.