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Rationally Design a Sulfur Cathode with Solid‐Phase Conversion Mechanism for High Cycle‐Stable Li–S Batteries
Author(s) -
He Bin,
Rao Zhixiang,
Cheng Zexiao,
Liu Dongdong,
He Danqi,
Chen Jie,
Miao Ziyun,
Yuan Lixia,
Li Zhen,
Huang Yunhui
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202003690
Subject(s) - materials science , electrolyte , cathode , sulfur , polysulfide , chemical engineering , lithium (medication) , polyacrylonitrile , battery (electricity) , fast ion conductor , redox , phase (matter) , inorganic chemistry , nanotechnology , electrode , chemistry , metallurgy , composite material , organic chemistry , physics , quantum mechanics , engineering , endocrinology , polymer , medicine , power (physics)
Solid–solid reactions are very effective for solving the main challenges of lithium–sulfur (Li–S) batteries, such as the shuttle effect of polysulfides and the high dependence of electrolyte consumption. However, the low sulfur content and sluggish redox kinetics of such cathodes dramatically limit the practical energy density of Li–S batteries. Here a rationally designed hierarchical cathode to simultaneously solve above‐mentioned challenges is reported. With nanoscale sulfur as the core, selenium‐doped sulfurized polyacrylonitrile (PAN/S 7 Se) as the shell and micron‐scale secondary particle morphology, the proposed cathode realizes excellent solid–solid reaction kinetics in a commercial carbonate electrolyte under high active species loading and a relatively low electrolyte/sulfur ratio. Such an approach provides a promising solution toward practical lithium sulfur batteries.