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Elastic, Conductive Coating Layer for Self‐Standing Sulfur Cathode Achieving Long Lifespan Li–S Batteries
Author(s) -
Wang Wenqiang,
Wang Dongya,
Wang Guiyou,
Zheng Mengyao,
Wang Gengchao
Publication year - 2020
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.201904026
Subject(s) - materials science , polysulfide , lithium–sulfur battery , cathode , polyurethane , coating , sulfur , lithium (medication) , layer (electronics) , chemical engineering , battery (electricity) , electrical conductor , polymer , composite material , nanotechnology , electrolyte , electrode , metallurgy , medicine , power (physics) , chemistry , physics , quantum mechanics , engineering , endocrinology
The shuttle of polysulfide and severe volume change of sulfur cathodes, are the bottlenecks in the practical application of lithium–sulfur batteries, and need to be solved through further exploration of simple and scalable strategies. Herein, an elastic and conductive coating layer is designed and synthesized, by combining water soluble conducting polymer modified carbon nanotubes (PASANTs) with crosslinked waterborne polyurethane ( c WPU). It shows high electronic conductivity and excellent resilience. As a result, a lithium–sulfur battery with c WPU/PASANTs coated cathode is able to achieve an outstanding cycle stability with a capacity of 70.8% after 500 cycles at 0.5C and an excellent rate performance (specific capacity of 1130 mAh g −1 at 0.1C and maintain 68.2% at 2C). This work embodies a systematic design concept, which shows the application prospects of large‐scale production, and is expected to be further applied to other easily pulverized high‐specific‐capacity materials such as silicon and tin.