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Enhanced Adsorption of Polysulfides on Carbon Nanotubes/Boron Nitride Fibers for High‐Performance Lithium‐Sulfur Batteries
Author(s) -
Li Mengyuan,
Fu Kun,
Wang Zhixuan,
Cao Chaochao,
Yang Jingwen,
Zhai Qinghong,
Zhou Zheng,
Ji Jiawei,
Xue Yanming,
Tang Chengchun
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202003807
Subject(s) - polysulfide , sulfur , cathode , boron nitride , materials science , carbon nanotube , chemical engineering , lithium (medication) , carbon fibers , adsorption , boron , nitride , energy storage , nanotechnology , chemistry , composite material , electrode , electrolyte , metallurgy , organic chemistry , composite number , layer (electronics) , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
Lithium‐sulfur (Li‐S) batteries are one of the most promising high‐energy‐density storage systems. However, serious capacity attenuation and poor cycling stability induced by the shuttle effect of polysulfide intermediates can impede the practical application of Li‐S batteries. Herein we report a novel sulfur cathode by intertwining multi‐walled carbon nanotubes (CNTs) and porous boron nitride fibers (BNFs) for the subsequent loading of sulfur. This structural design enables trapping of active sulfur and serves to localize the soluble polysulfide within the cathode region, leading to low active material loss. Compared with CNTs/S, CNTs/BNFs/S cathodes deliver a high initial capacity of 1222 mAh g −1 at 0.1 C. Upon increasing the current density to 4 C, the cell retained a capacity of 482 mAh g −1 after 500 cycles with a capacity decay of only 0.044 % per cycle. The design of CNTs/BNFs/S gives new insight on how to optimize cathodes for Li‐S batteries.