A Mechanically Flexible Necklace‐Like Architecture for Achieving Fast Charging and High Capacity in Advanced Lithium‐Ion Capacitors

Integration of fast charging, high capacity, and mechanical flexibility into one electrode is highly desired for portable energy‐storage devices. However, a high charging rate is always accompanied by capacity decay and cycling instability. Here, a necklace‐structured composite membrane consisting o...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2022-07, Vol.18 (27), p.e2201792-n/a
Main Authors: Liang, Tian, Mao, Zhifei, Li, Lingyao, Wang, Rui, He, Beibei, Gong, Yansheng, Jin, Jun, Yan, Chunjie, Wang, Huanwen
Format: Article
Language:English
Subjects:
Capacitors
Carbon fibers
Charging
Computer storage devices
Cubes
Cycles
Discharge
Electrodes
Energy storage
fast‐charging
FeSe 2
Flexibility
flexible
Lithium
lithium‐ion capacitors
Nanofibers
Nanotechnology
Portable equipment
Structural stability
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Summary:Integration of fast charging, high capacity, and mechanical flexibility into one electrode is highly desired for portable energy‐storage devices. However, a high charging rate is always accompanied by capacity decay and cycling instability. Here, a necklace‐structured composite membrane consisting of micron‐sized FeSe2 cubes uniformly threaded by carbon nanofibers (CNF) is reported. This unique electrode configuration can not only accommodate the volumetric expansion of FeSe2 during the lithiation/delithiation processes for structural robustness but also guarantee ultrafast kinetics for Li+ entry. At a high mass loading of 6.2 mg cm−2, the necklace‐like FeSe2@CNF electrode exhibits exceptional rate capability (80.7% capacity retention from 0.1 to 10 A g−1) and long‐term cycling stability (no capacity decay after 1100 charge–discharge cycles at 2 A g−1). The flexible lithium‐ion capacitor (LIC) fabricated by coupling a pre‐lithiated FeSe2@CNF anode with a porous carbon cathode delivers impressive volumetric energy//power densities (98.4 Wh L−1 at 157.1 W L−1, and 58.9 Wh L−1 at 15714.3 W L−1). The top performance, long‐term cycling stability, low self‐discharge rate, and high mechanical flexibility make it among the best LICs ever reported. A necklace‐structured composite membrane consisting of FeSe2 cubes uniformly threaded by carbon nanofibers is reported to integrate fast charging, high capacity, and mechanical flexibility into one electrode for lithium‐ion capacitors.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202201792