Multifunctional Molecule‐Grafted V2C MXene as High‐Kinetics Potassium‐Ion‐Intercalation Anodes for Dual‐Ion Energy Storage Devices

Constructing dual‐ion energy storage devices using anion‐intercalation graphite cathodes offers the unique opportunity to simultaneously achieve high energy density and output power density. However, a critical challenge remains in the lack of proper anodes that match with graphite cathodes, particu...

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Bibliographic Details
Published in:Advanced energy materials Vol. 14; no. 3
Main Authors: Sabaghi, Davood, Polčák, Josef, Yang, Hyejung, Li, Xiaodong, Morag, Ahiud, Li, Dongqi, Nia, Ali Shaygan, Khosravi H, Saman, Šikola, Tomáš, Feng, Xinliang, Yu, Minghao
Format: Journal Article
Language:English
Published: 19.01.2024
Subjects:
anode
dual‐ion energy storage
MXenes
potassium‐ion intercalation
surface grafting
ISSN:1614-6832, 1614-6840
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Summary:Constructing dual‐ion energy storage devices using anion‐intercalation graphite cathodes offers the unique opportunity to simultaneously achieve high energy density and output power density. However, a critical challenge remains in the lack of proper anodes that match with graphite cathodes, particularly in sustainable electrolyte systems using abundant potassium. Here, a surface grafting approach utilizing multifunctional azobenzene sulfonic acid is reported, which transforms V2C MXene into a high‐kinetics K+‐intercalation anode (denoted ASA‐V2C) for dual‐ion energy storage devices. Importantly, the grafted azobenzene sulfonic acid offers extra K+‐storage centers and fast K+‐hopping sites, while concurrently acting as a buffer between V2C layers to mitigate the structural distortion during K+ intercalation/de‐intercalation. These functionalities enable the V2C electrode with significantly enhanced specific capacity (173.9 mAh g−1 vs 121.5 mAh g−1 at 0.05 A g−1), rate capability (43.1% vs 12.0% at 20 A g−1), and cycling stability (80.3% vs 45.2% after 900 cycles at 0.05 A g−1). When coupled with an anion‐intercalation graphite cathode, the ASA‐V2C anode demonstrates its potential in a dual‐ion energy storage device. Notably, the device depicts a maximum energy density of 175 Wh kg−1 and a supercapacitor‐comparable power density of 6.5 kW kg−1, outperforming recently reported Li+‐, Na+‐, and K+‐based dual‐ion devices. The grafting of multifunctional azobenzene sulfonic acid onto V2C MXene is illustrated, which represents an effective strategy to create high‐kinetics anodes with substantially enhanced K+‐storage capacity. This modified V2C anode further enables the construction of dual‐ion energy storage devices characterized by simultaneously high energy and power density characteristics.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.202302961