Three-dimensional ordered macroporous ZIF-8 nanoparticle-derived nitrogen-doped hierarchical porous carbons for high-performance lithium-sulfur batteries

Lithium-sulfur (Li-S) batteries have attracted considerable attention due to their ultra-high specific capacity and energy density. However, there are still problems to be resolved such as poor conductivity of sulfur cathodes and dissolution of polysulfides in organic electrolytes. Herein, a novel Z...

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Bibliographic Details
Published in:RSC advances 2020-11, Vol.1 (69), p.41983-41992
Main Authors: Ji, Xinxin, Li, Qian, Yu, Haoquan, Hu, Xiaolin, Luo, Yuanzheng, Li, Buyin
Format: Article
Language:English
Subjects:
Cathodes
Cathodic dissolution
Chemisorption
Chemistry
Crystallization
Dissolution
Doping
Entrapment
Flux density
Ion transport
Lithium sulfur batteries
Nanoparticles
Nitrogen
Nonaqueous electrolytes
Polysulfides
Structural hierarchy
Sulfur
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Summary:Lithium-sulfur (Li-S) batteries have attracted considerable attention due to their ultra-high specific capacity and energy density. However, there are still problems to be resolved such as poor conductivity of sulfur cathodes and dissolution of polysulfides in organic electrolytes. Herein, a novel ZIF-8-derived nitrogen-doped connected ordered macro-microporous carbon (COM-MPC) was developed by a dual solvent-assisted in situ crystallization method within a face-centered cubic stacking sphere template, which acts as an advanced sulfur host for enhanced Li-S battery performance. Compared with the conventional predominant microporous C-ZIF-8, the unique hierarchical macro-microporous structure with nitrogen doping not only renders polysulfide intermediates enhanced entrapment by confining the effect of micropores and chemisorption of doping N atoms, but also facilitates electrolyte accessibility and efficient ion transport owing to the ordered macroporous structure. Benefitting from this, the COM-MPC@S cathode delivers a high initial specific capacity of 1498.5 mA h g −1 and a reversible specific capacity of 1118.9 mA h g −1 . Moreover, the COM-MPC@S cathode exhibits 82.3% of capacity retention within 10th to 50th cycle at 0.5C and a large capacity of 608.5 mA h g −1 after 50 cycles at a higher rate of 1C, and this enhanced cycling stability and rate capability demonstrate great practical application potential in Li-S battery systems. Lithium-sulfur (Li-S) batteries have attracted considerable attention due to their ultra-high specific capacity and energy density.
ISSN:2046-2069
2046-2069
DOI:10.1039/d0ra07114e