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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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Article information


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

Energy Environ. Sci., 2020, Advance Article
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, Advance Article , DOI: 10.1039/C9EE03682B

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