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Issue 2, 2020
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SnO2 nanoparticles anchored on carbon foam as a freestanding anode for high performance potassium-ion batteries

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Abstract

Potassium-ion batteries (PIBs) are considered as potential replacements to lithium-ion batteries for large scale energy storage applications due to abundant potassium resources and low cost. However, it is a rough road to find suitable materials with high capacity and cycling stability due to the large K ion radius. In this study, a simple method, electrodeposition, is used to anchor SnO2 nanoparticles on three dimensional carbon foam (SnO2@CF) as a freestanding anode for PIBs. The prepared freestanding SnO2@CF electrode features a three dimensional (3D) conductive carbon frame and SnO2 nanoparticles, which can enhance electron transfer, prevent SnO2 from losing electrical contact after large volume changes and facilitate electrolyte infiltration and K ion transfer. As expected, SnO2@CF delivers a high K storage specific capacity, and outstanding cycling stability (231.7 mA h g−1 after 400 cycles at 1 A g−1) and rate performance (371.4, 307.6, 247.3 and 143.5 mA h g−1 at 0.5, 1, 2 and 5 A g−1, respectively). Meanwhile, the phase transition of the SnO2@CF electrode is tracked during the charge and discharge processes in PIBs. This study provides a facile method to prepare freestanding electrode materials and a promising anode material for PIBs.

Graphical abstract: SnO2 nanoparticles anchored on carbon foam as a freestanding anode for high performance potassium-ion batteries

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Supplementary files

Article information


Submitted
06 Aug 2019
Accepted
06 Jan 2020
First published
06 Jan 2020

Energy Environ. Sci., 2020,13, 571-578
Article type
Paper

SnO2 nanoparticles anchored on carbon foam as a freestanding anode for high performance potassium-ion batteries

H. Qiu, L. Zhao, M. Asif, X. Huang, T. Tang, W. Li, T. Zhang, T. Shen and Y. Hou, Energy Environ. Sci., 2020, 13, 571
DOI: 10.1039/C9EE03682B

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