Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 50, Pages 18108-18115Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201912287
Keywords
graphitic carbon nanospring; long-term stability; mesoporous materials; potassium-ion batteries; ultra-high capacity
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Funding
- National Natural Science Foundation of China [21701163, 21671181, 21831006]
- Anhui Provincial Natural Science Foundation [1808085QB25]
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A highly oriented mesoporous graphitic carbon nanospring (OGCS) with graphitic layers that are perpendicular to the axis is prepared by hydrothermal treatment of epoxy resin at 500 degrees C and annealing at 1400 degrees C. Water plays an important role in not only forming the graphitic carbon nanospring with a high [002] orientation and a large amount of active edge-plane sites, but also in the generation of the mesoporous structure, which facilitate fast K-ion adsorption and diffusion. In situ and ex situ measurements confirm that OGCS undergoes K-adsorption in mesopores and then K-intercalation in the graphite layer to form KC8 with a low discharge voltage. The spring-like nanostructure can expand one-dimensionally along the axial direction to accommodate the volume variation. The OGCS electrode thus shows a much better K-storage performance than that of unoriented graphitic carbon.
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