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Enhanced Chemisorption and Catalytic Effects toward Polysulfides by Modulating Hollow Nanoarchitectures for Long‐Life Lithium–Sulfur Batteries
Author(s) -
Li Zhonglin,
Xiao Zhubing,
Li Pengyue,
Meng Xueping,
Wang Ruihu
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201906114
Subject(s) - polysulfide , nanodot , materials science , catalysis , electrochemistry , zeolitic imidazolate framework , chemical engineering , sulfur , lithium (medication) , nanoparticle , redox , nanotechnology , imidazolate , electrode , carbon fibers , adsorption , electrolyte , chemistry , metal organic framework , organic chemistry , composite number , medicine , endocrinology , engineering , composite material , metallurgy
Hollow nanostructures with intricate interior and catalytic effects hold great promise for the construction of advanced lithium–sulfur batteries. Herein, a double‐shelled hollow polyhedron with inlaid cobalt nanoparticles encapsulated by nitrogen‐doped carbon (Co/NC) nanodots (Co‐NC@Co 9 S 8 /NPC) is reported, which is acquired by using imidazolium‐based ionic‐polymer‐encapsulated zeolitic imidazolate framework‐67 as a core‐shelled precursor. The Co/NC nanodots promote redox kinetics and chemical adsorbability toward polysulfides, while the interconnected double shells serve as a nanoscale electrochemical reaction chamber, which effectively suppresses the polysulfide shuttling and accelerates ion/electron transport. Benefiting from structural engineering and reaction kinetics modulation, the Co‐NC@Co 9 S 8 /NPC‐S electrode exhibits high cycling stability with a low capacity decay of 0.011% per cycle within 2000 cycles at 2 C. The electrode still shows high rate performance and cyclability over 500 cycles even in the case of high sulfur loading of 4.5 mg cm −2 and 75 wt% sulfur content. This work provides one type of new hollow nanoarchitecture for the development of advanced Li–S batteries and other energy storage systems.