Issue 9, 2021

Rational design of porous Sn nanospheres/N-doped carbon nanofibers as an ultra-stable potassium-ion battery anode material

Abstract

Potassium-ion batteries (PIBs) are considered as a promising candidate for large-scale energy storage applications due to the abundant potassium resources. In this work, a hybrid of porous Sn nanospheres incorporated in N-doped carbon nanofiber frameworks (Sn/N-CNFs) was fabricated via electrospinning and a subsequent carbonization process. As a PIB anode, Sn/N-CNFs exhibit superior cycling stability (198.0 mA h g−1 at 1 A g−1 after 3000 cycles, and the corresponding capacity retention rate is as high as 88.4%), outperforming other Sn-based materials. Such an excellent performance is ascribed to the synergistic effects of porous Sn nanospheres composed of ultra-small nanoparticles as well as to the unique and interconnected network of N-CNFs, which provide sufficient space for the volume expansion/contraction of Sn, supply efficient electrolyte diffusion paths, offer short K+ diffusion distance, suppress the agglomeration of Sn nanoparticles, enhance the electronic conductivity, and thus facilitate the electron/ion transport.

Graphical abstract: Rational design of porous Sn nanospheres/N-doped carbon nanofibers as an ultra-stable potassium-ion battery anode material

Supplementary files

Article information

Article type
Paper
Submitted
26 Nov 2020
Accepted
21 Jan 2021
First published
21 Jan 2021

J. Mater. Chem. A, 2021,9, 5740-5750

Rational design of porous Sn nanospheres/N-doped carbon nanofibers as an ultra-stable potassium-ion battery anode material

C. Li, A. T. Bi, H. L. Chen, Y. R. Pei, M. Zhao, C. C. Yang and Q. Jiang, J. Mater. Chem. A, 2021, 9, 5740 DOI: 10.1039/D0TA11501K

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