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Ultrasmall SnO2 nanocrystals embedded in porous carbon as potassium ion battery anodes with long-term cycling performance

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Abstract

Alloy-based anodes have been perceived as promising candidates for potassium ion batteries with regard to their remarkable electrochemical performance. Although tin dioxide (SnO2) has been widely studied as a high performance alloy-based anode in lithium ion batteries, there are few works on the use of SnO2 as an anode in potassium ion batteries. Here, we successfully synthesized ultrasmall SnO2 nanocrystals with a homogeneous size of 2–6 nm embedded in porous carbon using a facile hydrothermal method. The composite exhibits excellent electrochemical performance, which can be attributed to the well-defined porous carbon matrix and the well-restrained nano-scale SnO2 nanocrystals. At a low current density of 100 mA g−1, the composite material delivers a reversible capacity of 300 mA h g−1 after 100 cycles. Notably, the anode maintains a high reversible capacity of 108.3 mA h g−1 (based on the total mass of the composite) even after 10 000 cycles at a current density of 1 A g−1.

Graphical abstract: Ultrasmall SnO2 nanocrystals embedded in porous carbon as potassium ion battery anodes with long-term cycling performance

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Article information


Submitted
18 Jan 2020
Accepted
08 Jun 2020
First published
09 Jun 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Ultrasmall SnO2 nanocrystals embedded in porous carbon as potassium ion battery anodes with long-term cycling performance

S. Luo, T. Wang, H. Lu, X. Xu, G. Xue, N. Xu, Y. Wang and D. Zhou, New J. Chem., 2020, Advance Article , DOI: 10.1039/D0NJ00323A

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