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A carbon microtube array with a multihole cross profile: releasing the stress and boosting long-cycling and high-rate potassium ion storage

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Abstract

The abundance and low cost of potassium resources make potassium ion batteries (PIBs) a future energy storage system. However, it is difficult for current electrode materials to offer enough space to stably store large-sized potassium ions. In this study, using sycamore leaves as the raw material, a porous carbon microtube (PCM) array derived from carbon quantum dots (CQDs) is obtained. The resulting PCM features a multihole cross profile, high surface area (300.3 m2 g−1), and much larger interlayer spacing (0.396 nm). The experimental results and finite element analysis show that the PCM has a strong stable structure to release the stress against pulverization during cycling. As an anode material for PIBs, the PCM electrode displays a capacity of 177.6 mA h g−1 over 2000 cycles at a very high current density of 2000 mA g−1, which is among the best high-rate stabilities ever reported. In terms of cost effectiveness, long cycle lifespan and mass production, this work represents a brilliant prospect of anode materials for PIBs.

Graphical abstract: A carbon microtube array with a multihole cross profile: releasing the stress and boosting long-cycling and high-rate potassium ion storage

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Publication details

The article was received on 31 Aug 2019, accepted on 16 Oct 2019 and first published on 17 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA09598E
J. Mater. Chem. A, 2019, Advance Article

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    A carbon microtube array with a multihole cross profile: releasing the stress and boosting long-cycling and high-rate potassium ion storage

    B. Wang, F. Yuan, W. (. Wang, D. Zhang, H. Sun, K. Xi, D. Wang, J. Chu, Q. Wang and W. Li, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA09598E

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