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Electrospun zeolitic imidazolate framework‐derived nitrogen‐doped carbon nanofibers with high performance for lithium‐sulfur batteries
Author(s) -
Yao Shanshan,
Xue Sikang,
Peng Sihuang,
Jing Maoxiang,
Shen Xiangqian,
Li Tianbao,
YiLiu Zhuozi
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4389
Subject(s) - zeolitic imidazolate framework , carbon nanofiber , imidazolate , materials science , electrospinning , chemical engineering , carbonization , nanofiber , electrochemistry , cathode , bet theory , lithium (medication) , membrane , physisorption , specific surface area , carbon fibers , electrolyte , inorganic chemistry , chemistry , composite number , nanotechnology , metal organic framework , composite material , electrode , catalysis , carbon nanotube , organic chemistry , adsorption , scanning electron microscope , endocrinology , engineering , medicine , polymer , biochemistry
Summary Three‐dimensional (3D) nitrogen‐doped carbon nanofibers (N‐CNFs) which were originating from nitrogen‐containing zeolitic imidazolate framework‐8 (ZIF‐8) were obtained by a combined electrospinning/carbonization technique. The pores uniformly distributed in N‐CNFs result in the improvement of electrical conductivity, increasing of BET surface area (142.82 m 2 g −1 ), and high porosity. The as‐synthesized 3D free‐standing N‐CNFs membrane was applied as the current collector and binder free containing Li 2 S 6 catholyte for lithium‐sulfur batteries. As a novel composite cathode, the free‐standing N‐CNFs/Li 2 S 6 membrane shows more stable electrochemical behavior than the CNFs/Li 2 S 6 membrane, exhibiting a high first‐cycle discharge specific capacity of 1175 mAh g −1 at 0.1 C and keeping discharge specific capacity of 702 mAh g −1 at higher rate. More importantly, as the sulfur mass in cathodes was increased at 7.11 mg, the N‐CNFs/Li 2 S 6 membrane delivered 467 mAh g −1 after 150 cycles at 0.2 C. The excellent electrochemical properties of N‐CNFs/Li 2 S 6 membrane can be ascribed to synergistic effects of high porosity and nitrogen‐doping in N‐CNFs from carbonized ZIF‐8, illustrating collective effects of physisorption and chemisorption for lithium polysulfides in discharge‐charge processes.