Roll-to-roll fabricated polymer composites filled with subnanosheets exhibiting high energy density and cyclic stability at 200 °C

Minzheng Yang, Haoyang Li, Jian Wang, Wenxiong Shi, Qinghua Zhang, Hanzheng Xing, Weibin Ren, Binzhou Sun, Mengfan Guo, Erxiang Xu, Nannan Sun, Le Zhou, Yao Xiao, Mufeng Zhang, Zhong Li, Jiayu Pan, Jianyong Jiang, Zhonghui Shen, Xiaoyan Li, Lin Gu, Ce-Wen Nan, Xun Wang () and Yang Shen ()
Additional contact information
Minzheng Yang: Tsinghua University
Haoyang Li: Tsinghua University
Jian Wang: Wuhan University of Technology
Wenxiong Shi: Tianjin University of Technology
Qinghua Zhang: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Hanzheng Xing: Tsinghua University
Weibin Ren: Tsinghua University
Binzhou Sun: Wuzhen Laboratory
Mengfan Guo: Tsinghua University
Erxiang Xu: Tsinghua University
Nannan Sun: Tsinghua University
Le Zhou: Tsinghua University
Yao Xiao: Tsinghua University
Mufeng Zhang: Tsinghua University
Zhong Li: Tsinghua University
Jiayu Pan: Wuzhen Laboratory
Jianyong Jiang: Wuzhen Laboratory
Zhonghui Shen: Wuhan University of Technology
Xiaoyan Li: Tsinghua University
Lin Gu: Tsinghua University
Ce-Wen Nan: Tsinghua University
Xun Wang: Tsinghua University
Yang Shen: Tsinghua University

Nature Energy, 2024, vol. 9, issue 2, 143-153

Abstract: Abstract Polymers are key dielectric media for energy storage capacitors in power electronics for electric vehicles and solar panels, and there is an urgent need to enhance their discharged energy density (Ud) at high temperatures. Existing polymer–inorganic nanocomposites with high Ud cannot be produced by conventional roll-to-roll fabrication processes and exhibit compromised cyclic stability. In this study, we introduced phosphotungstic acid subnanosheets, a ‘reservoir’ for charges, into polymers to form a subnanocomposite. Even a low loading (0.2 wt%) of ultralarge, ultrathin, flexible subnanosheets was found to effectively strengthen polymers and hinder the propagation of breakdown paths. These subnanosheets can also trap charges through grafted surfactant molecules and polyoxometalate cluster backbones. An ultrahigh Ud of 7.2 J cm−3 with a charge–discharge efficiency of 90% and charge–discharge cycle stability up to 5 × 105 cycles at 200 °C were observed. Furthermore, a 100-metre-long roll of the subnanocomposite film was roll-to-roll fabricated on an industrial solution-casting production line. This work demonstrates the potential of this subnanocomposite strategy for the mass fabrication and application of high-performance polymer dielectrics.

Date: 2024
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DOI: 10.1038/s41560-023-01416-3

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