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Cobalt‐Doped SnS 2 with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries
Author(s) -
Gao Xuejie,
Yang Xiaofei,
Li Minsi,
Sun Qian,
Liang Jianneng,
Luo Jing,
Wang Jiwei,
Li Weihan,
Liang Jianwen,
Liu Yulong,
Wang Sizhe,
Hu Yongfeng,
Xiao Qunfeng,
Li Ruying,
Sham TsunKong,
Sun Xueliang
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201806724
Subject(s) - polysulfide , materials science , cathode , electrochemistry , doping , cobalt , electrocatalyst , carbon nanotube , sulfur , catalysis , chemical engineering , kinetics , nanotechnology , electrode , chemistry , optoelectronics , electrolyte , organic chemistry , metallurgy , physics , quantum mechanics , engineering
The application of Li‐S batteries is hindered by low sulfur utilization and rapid capacity decay originating from slow electrochemical kinetics of polysulfide transformation to Li 2 S at the second discharge plateau around 2.1 V and harsh shuttling effects for high‐S‐loading cathodes. Herein, a cobalt‐doped SnS 2 anchored on N‐doped carbon nanotube (NCNT@Co‐SnS 2 ) substrate is rationally designed as both a polysulfide shield to mitigate the shuttling effects and an electrocatalyst to improve the interconversion kinetics from polysulfides to Li 2 S. As a result, high‐S‐loading cathodes are demonstrated to achieve good cycling stability with high sulfur utilization. It is shown that Co‐doping plays an important role in realizing high initial capacity and good capacity retention for Li‐S batteries. The S/NCNT@Co‐SnS 2 cell (3 mg cm −2 sulfur loading) delivers a high initial specific capacity of 1337.1 mA h g −1 (excluding the Co‐SnS 2 capacity contribution) and 1004.3 mA h g −1 after 100 cycles at a current density of 1.3 mA cm −2 , while the counterpart cell (S/NCNT@SnS 2 ) only shows an initial capacity of 1074.7 and 843 mA h g −1 at the 100th cycle. The synergy effect of polysulfide confinement and catalyzed polysulfide conversion provides an effective strategy in improving the electrochemical performance for high‐sulfur‐loading Li‐S batteries.