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Insights into high capacity and ultrastable carbonaceous anodes for potassium-ion storage via a hierarchical heterostructure

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Abstract

Carbonaceous materials are promising anode materials for potassium-ion batteries (PIBs). However, due to the large size of K+ ions, pristine carbon anode materials exhibit poor rate capability and unsatisfactory cycling stability. Herein, a novel anode with a hierarchical porous carbon structure and defects is reported. Integrating the mesoporous structure and P-dopants at the carbon surface not only offers more active sites for K+ adsorption but also enlarges the layer spacing to accommodate stress during potassiation/depotassiation. The as-prepared electrode exhibits ultrahigh stability at a current of 1 A g−1 (over 10 000 cycles without obvious capacity decay) and superior rate capability (165 mA h g−1 at a current density of 10 A g−1), outperforming most of the reported carbonaceous electrodes in PIBs. Through integrated comprehensive experimental characterization and theoretical calculations, the charge storage and transport mechanisms in such a material demonstrate that P doping into the porous structure is beneficial for synergistically improving K+ ion storage and transport by enhancing the adsorption of K+ ions and reducing the diffusion barrier of K+ ions. This work sheds light on how tailored heterostructures could enhance K+ storage and transport and provide new pathways for materials design for ultrastable PIBs.

Graphical abstract: Insights into high capacity and ultrastable carbonaceous anodes for potassium-ion storage via a hierarchical heterostructure

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Article information


Submitted
27 Nov 2019
Accepted
09 Jan 2020
First published
09 Jan 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Insights into high capacity and ultrastable carbonaceous anodes for potassium-ion storage via a hierarchical heterostructure

C. Ma, H. Yang, Z. Xu, Z. Fu, Y. Xie, H. Zhang, M. Hong, Z. Ma, H. Xiong and X. Yuan, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA12997A

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