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The chain-mail Co@C electrocatalyst accelerating one-step solid-phase redox for advanced Li-Se batteries

Recently, Se cathodes have caught growing attention owing to their higher electronic conductivity, better compatibility with the carbonate electrolyte and comparable theoretical volumetric capacity to S cathodes. However, large volume variation, shuttle effect and sluggish redox kinetics have hinder...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-04, Vol.1 (14), p.859-867
Main Authors: Dong, Wen-Da, Li, Chao-Fan, Li, Hong-Yan, Wu, Liang, Mohamed, Hemdan S. H, Hu, Zhi-Yi, Chen, Li-Hua, Li, Yu, Su, Bao-Lian
Format: Article
Language:English
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Summary:Recently, Se cathodes have caught growing attention owing to their higher electronic conductivity, better compatibility with the carbonate electrolyte and comparable theoretical volumetric capacity to S cathodes. However, large volume variation, shuttle effect and sluggish redox kinetics have hindered the development of Li-Se batteries. Herein, we report chain-mail Co@C nanoparticles (Co@C NPs) embedded in macro-meso-microporous carbon nanofibers (CPCFs) with the characteristics of generalized Murray's law as a flexible Se host for advanced Li-Se batteries. The chain-mail Co@C structure protects Co from both active species and electrolyte, and then strengthens the adsorption-catalytic functions for active Se and Li 2 Se, thus improving the one-step solid-phase redox. In addition, the hierarchical porous structure enhances mass transfer and relieves volume expansion. Accordingly, the Se@CPCFs cathode demonstrates a high capacity of ∼500 mA h g −1 at 0.2C (1C = 675 mA g −1 ) after 500 cycles and exhibits high-capacity retention of 97.4%, 97.6%, and 99.1% between 1 and 100, 100 and 300, and 300 and 500 cycles. An excellent rate capability at 10C with a reversible specific capacity of 438 mA h g −1 is also realized. This work pioneered the utilization of chain-mail metal NPs as electrocatalysts to accelerate the solid-phase redox kinetics of Se cathodes for advanced Li-Se batteries. The chain-mail Co@C electrocatalyst in hierarchical porous carbon nanofibers was designed to accelerate solid-phase Li-Se electrochemistry and improve the anchoring effect of the carbon matrix.
ISSN:2050-7488
2050-7496
DOI:10.1039/d1ta10193e