Aqueous hybrid electrochemical capacitors with ultra-high energy density approaching for thousand-volts alternating current line filtering

Zhou Li, Xiaopeng Wang (), Lingyu Zhao, Fengyao Chi, Chang Gao, Ying Wang, Mengdan Yan, Qian Zhou, Miaomiao Zhao, Xinyang Wang, Jiaqi Wang, Man Yuan, Mingmao Wu, Lixia Wang (), Yang Zhao () and Liangti Qu
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Zhou Li: Henan Agricultural University
Xiaopeng Wang: Henan Agricultural University
Lingyu Zhao: Henan Agricultural University
Fengyao Chi: Tsinghua University
Chang Gao: Beijing Institute of Technology
Ying Wang: Beijing Institute of Technology
Mengdan Yan: Henan Agricultural University
Qian Zhou: Henan Agricultural University
Miaomiao Zhao: Henan Agricultural University
Xinyang Wang: Henan Agricultural University
Jiaqi Wang: Beijing Institute of Technology
Man Yuan: Beijing Institute of Technology
Mingmao Wu: Fuzhou University
Lixia Wang: Henan Agricultural University
Yang Zhao: Beijing Institute of Technology
Liangti Qu: Tsinghua University

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Filtering capacitors with wide operating voltage range are essential for smoothing ripples in line-powered system, which are still unsatisfactory due to low energy density and limited working voltage scopes. Herein, we report an aqueous hybrid electrochemical capacitor with areal specific energy density of 1.29 mF V2 cm−2 at 120 Hz, greater than common aqueous ones. Interestingly, it can be easily integrated at scale to show excellent flexibility, controllable and stable filtering performance, in which an integrated device (e.g., seven units in series) exhibits fluctuation of 96 mV, 10 times smaller than an aluminum electrolytic capacitor with similar capacitance. A record-high 1,000 V can also be achieved after integrating 670 units, exceeding those reported so far, and about 1.5 times of commercial bulk aluminum electrolytic capacitors (~700 V). This work opens up a new insight for promising applications in multiple electricity transmission systems that requiring high smoothness under harsh voltage.

Date: 2022
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DOI: 10.1038/s41467-022-34082-2

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