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Hard carbon (HC), composed of disorder graphite domain construction, provides defects, gaps, and nanopores that are beneficial for storing K-ion. In this work, hard carbon derived from spent black tea (THC) is synthesized through a two-step carbonization process. THC is an easy preparation, green, and high-abundance carbon material for highly stable potassium-ion storage. As an anode for potassium-ion batteries, it delivers a high capacity of 203 mA h g−1 at 30 mA g−1 and long-term cycling life with 90% capacity retention over 3.6 months. This superior cycle life is attributed to the highly reversible structure, rapid ion diffusion rate, and charge transfer rate of THC. Not only that, a full cell was assembled with THC as the anode and perylene 3,4,9,10-tetracarboxylic dianhydride (PTCDA) as the cathode. The PTCDA//THC delivers a high capacity of 48.6 mA h g−1 and an energy density of 107 W h kg−1 at 100 mA g−1. These findings suggest that THC has considerable promise as a low-cost, high-stability anode material for potassium-ion batteries. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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Ionics
ISSN: 0947-7047
Year: 2023
Issue: 9
Volume: 29
Page: 3517-3523
2 . 4
JCR@2023
2 . 4 0 0
JCR@2023
ESI HC Threshold:30
JCR Journal Grade:3
CAS Journal Grade:4
Cited Count:
SCOPUS Cited Count: 2
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 2
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