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Significantly enhanced energy density of nanodiamond/polyimide composites at high temperatures with ultralow nanodiamond contents

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Abstract

The development of miniature devices has generated a large demand for dielectric polymers with high energy storage density, especially at high temperatures. First, poly(methyl methacrylate) (PMMA)-coated nanodiamond (ND) particles were incorporated into a polyimide (PI) substrate to fabricate ND-g-PMMA/PI (NPP) composites. We found for the first time that with a very low content (0.4 vol.%) of ND particles, NPP-0.4 composite material gave the dielectric constant of 4.4, which is 37.5% higher than that of the PI film. The maximum energy density of the NPP-0.4 composite film achieves 9.4 J cm−3 at room temperature, which is 54% higher than that of the PI film. Furthermore, we found that the NPP-0.2 composite reaches the highest energy density and discharge efficiency of 5.77 J cm−3 and 72.3% at 150°C, which are 104% and 51.3% higher than those of the PI film at 150°C. This result shows a much higher energy density than most previously published results for high-temperature polymer capacitors. This phenomenon can be explained by the simulation results using COMSOL in which the interface polarization of ND/PI composites reached their maximum value with ultralow ND contents (0.4 vol.%). This research shows great promise for polymer capacitors with relatively high energy density at high temperatures.

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Authors and Affiliations

  1. Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, China

    ChengWei Wang, JunYuan Tian & KaiLiang Ren

  2. Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning, 530004, China

    XiaoDan Cao, Fang Yu, FengYing Jiang & KaiLiang Ren

  3. School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China

    ChengWei Wang & JunYuan Tian

Authors
  1. ChengWei Wang
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  2. XiaoDan Cao
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  3. JunYuan Tian
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  4. Fang Yu
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  5. FengYing Jiang
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Correspondence to KaiLiang Ren.

Additional information

This work was supported by the National Key Research & Development Project of China (Grant No. 2021YFB3200303), and the National Natural Science Foundation of China (Grant No. 52172082).

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The supporting information is available online at tech.scichina.com and link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Significantly enhanced energy density of nanodiamond/polyimide composites at high temperatures with ultralow nanodiamond contents

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Wang, C., Cao, X., Tian, J. et al. Significantly enhanced energy density of nanodiamond/polyimide composites at high temperatures with ultralow nanodiamond contents. Sci. China Technol. Sci. 66, 956–965 (2023). https://doi.org/10.1007/s11431-022-2251-1

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  • DOI: https://doi.org/10.1007/s11431-022-2251-1

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