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Liang T, Mao Z, Li L, Wang R, He B, Gong Y, Jin J, Yan C, Wang H. A Mechanically Flexible Necklace-Like Architecture for Achieving Fast Charging and High Capacity in Advanced Lithium-Ion Capacitors. Small 2022; 18:e2201792. [PMID: 35661404 DOI: 10.1002/smll.202201792] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 05/17/2022] [Indexed: 06/15/2023]
Abstract
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.
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Affiliation(s)
- Tian Liang
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Zhifei Mao
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Lingyao Li
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Rui Wang
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Beibei He
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Yansheng Gong
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Jun Jin
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Chunjie Yan
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Huanwen Wang
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
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