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The Crystallinity of Metal Oxide in Carbonized Metal Organic Frameworks and the Effect on Restricting Polysulfides
Author(s) -
Yan Yingchun,
Wei Liangqin,
Su Xin,
Deng Shenzhen,
Feng Jianze,
Yang Jun,
Chi Mingna,
Lei Hu,
Li Zhongtao,
Wu Mingbo
Publication year - 2020
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201900642
Subject(s) - crystallinity , materials science , carbonization , faraday efficiency , amorphous solid , carbon fibers , amorphous carbon , chemical engineering , electrochemistry , metal , oxide , metal organic framework , pyrolysis , chemistry , electrode , organic chemistry , metallurgy , composite material , adsorption , composite number , scanning electron microscope , engineering
Metal/carbon nanohybrids show promise for alleviating polysulfides shuttling in lithium‐sulfur batteries. However, the synergetic effect between amorphous metal and carbon to restrict the migration of polysulfides is still far from fully understood. Herein, two porous metal/carbon nanohybrids with different crystallinity metal oxides components (amorphous Al 2 O 3 and crystal Fe 3 O 4 ) have been prepared through pyrolysis of the MOF precursors, which are adopted as a sulfur support to impede the polysulfides shuttling. As expected, the amorphous Al 2 O 3 with nitrogen‐doped porous carbon exhibits an attractive durability at 1 C over 1000 cycles, meanwhile, the coulombic efficiency could maintain at 97.5%. Compared to it, crystal Fe 3 O 4 shows an inferior electrochemical performance, which is attributed to the amorphous structure that can accelerate ions diffusion and charge transfer to improve the rate performance and capacity. The distinguished discharge performance of the design will be potentially used to develop applicable Li‐S batteries.