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Polysulfide Trapping in Carbon Nanofiber Cloth/S Cathode with a Bifunctional Separator for High‐Performance Li–S Batteries
Author(s) -
Ren Wenchen,
Ma Wei,
Jin Xin,
Zhang Shufen,
Tang Bingtao
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201900484
Subject(s) - polysulfide , separator (oil production) , cathode , graphene , bifunctional , materials science , carbon nanofiber , nanofiber , fabrication , chemical engineering , electrochemistry , nanotechnology , nanowire , chemistry , electrode , organic chemistry , carbon nanotube , catalysis , electrolyte , medicine , physics , alternative medicine , pathology , engineering , thermodynamics
The development of carbon nanofiber (CNF) cloth‐based cathodes is essential for the fabrication of high energy density and flexible Li–S batteries. Surface modification is generally used to improve the electrochemical performance of CNF cloth/S cathodes. However, this strategy creates some problems such as structure collapse, complex fabrication steps, and poor consistency. Herein, a β‐MnO 2 nanowire/graphene‐modified separator is used to improve the performance of CNF cloth/S cathodes without changing their structure. β‐MnO 2 can facilitate chemical bonding with polysulfides, whereas graphene can decrease the inner resistance and trap polysulfide by physical shielding. The cathode with the bifunctional separator displayed a high discharge capacity of 529.9 mAh g −1 with a low capacity decay of 0.051 % per cycle after 500 cycles at 1 C, which is 3 times higher compared with a bare separator. Even with a high sulfur loading of 9.0 mg cm −2 , a high areal capacity of 3.8 mAh cm −2 was delivered over 100 cycles.