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Accordion‐Like Carbon with High Nitrogen Doping for Fast and Stable K Ion Storage

Accordion‐Like Carbon with High Nitrogen Doping for Fast and Stable K Ion Storage Potassium ion battery (PIB) is a potential candidate for future large‐scale energy storage. A key challenge is that the (de)potassiation stability of graphitic carbon anodes is hampered by the limited (002) interlayer spacing. Amorphous carbon with a hierarchical structure can buffer the volume change during repeated (de)potassiation and enable stable cycling. Herein, a direct pyrolysis approach is demonstrated to synthesize a highly nitrogen‐doped (26.7 at.%) accordion‐like carbon anode composed of thin carbon nanosheets and a turbostratic crystalline structure. The hierarchical structure of accordion‐like carbon is endowed by a self‐assembly process during pyrolysis carbonization. The hierarchical nitrogen‐doped accordion structure enables a high reversible capacity of 346 mAh g−1 and superior cycling stability. This work constitutes a general synthesis methodology that can be used to prepare hierarchical carbon anodes for advanced PIBs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

Accordion‐Like Carbon with High Nitrogen Doping for Fast and Stable K Ion Storage

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References (46)

Publisher
Wiley
Copyright
© 2021 Wiley‐VCH GmbH
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.202101928
Publisher site
See Article on Publisher Site

Abstract

Potassium ion battery (PIB) is a potential candidate for future large‐scale energy storage. A key challenge is that the (de)potassiation stability of graphitic carbon anodes is hampered by the limited (002) interlayer spacing. Amorphous carbon with a hierarchical structure can buffer the volume change during repeated (de)potassiation and enable stable cycling. Herein, a direct pyrolysis approach is demonstrated to synthesize a highly nitrogen‐doped (26.7 at.%) accordion‐like carbon anode composed of thin carbon nanosheets and a turbostratic crystalline structure. The hierarchical structure of accordion‐like carbon is endowed by a self‐assembly process during pyrolysis carbonization. The hierarchical nitrogen‐doped accordion structure enables a high reversible capacity of 346 mAh g−1 and superior cycling stability. This work constitutes a general synthesis methodology that can be used to prepare hierarchical carbon anodes for advanced PIBs.

Journal

Advanced Energy MaterialsWiley

Published: Nov 1, 2021

Keywords: edge nitrogen dopant; nitrogen‐doped carbon; potassium ion batteries; pyrolysis; self‐assembly

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