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Monodispersed FeS 2 Electrocatalyst Anchored to Nitrogen‐Doped Carbon Host for Lithium–Sulfur Batteries
Author(s) -
Sun Weiwei,
Liu Shuangke,
Li Yujie,
Wang Danqin,
Guo Qingpeng,
Hong Xiaobin,
Xie Kai,
Ma Zhongyun,
Zheng Chunman,
Xiong Shizhao
Publication year - 2022
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.202205471
Subject(s) - materials science , polysulfide , cathode , sulfur , chemical engineering , carbon fibers , electrolyte , nanoclusters , lithium (medication) , electrocatalyst , catalysis , electrochemistry , inorganic chemistry , nanotechnology , electrode , chemistry , composite material , organic chemistry , metallurgy , medicine , endocrinology , composite number , engineering
Despite their high theoretical energy density, lithium–sulfur (Li–S) batteries are hindered by practical challenges including sluggish conversion kinetics and shuttle effect of polysulfides. Here, a nitrogen‐doped continuous porous carbon (CPC) host anchoring monodispersed sub‐10 nm FeS 2 nanoclusters (CPC@FeS 2 ) is reported as an efficient catalytic matrix for sulfur cathode. This host shows strong adsorption of polysulfides, promising the inhibition of polysulfide shuttle and the promoted initial stage of catalytic conversion process. Moreover, fast lithium ion (Li‐ion) diffusion and accelerated solid–solid conversion kinetics of Li 2 S 2 to Li 2 S on CPC@FeS 2 host guarantee boosted electrochemical kinetics for conversion process of sulfur species in Li–S cell, which gives a high utilization of sulfur under practical conditions of high loading and low electrolyte/sulfur (E/S) ratio. Therefore, the surfur cathode (S/CPC@FeS 2 ) delivers a high specific capacity of 1459 mAh g −1 at 0.1 C, a stable cycling over 900 cycles with ultralow fading rate of 0.043% per cycle, and an enhanced rate capability compared with cathode only using carbon host. Further demonstration of this cathode in Li–S pouch cell shows a practical energy density of 372 Wh kg −1 with a sulfur loading of 7.1 mg cm −2 and an E/S ratio of 4 µL mg −1 .