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SiO2 particle-supported ultrathin graphene hybrids/polyvinylidene fluoride composites with excellent dielectric performance and energy storage density

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Abstract

Polymer composites of polyvinylidene fluoride (PVDF) filled with SiO2–reduced graphene oxide (RGO) hybrids were fabricated and their dielectric properties and energy storage performance were systematically investigated. Hybrid SiO2–RGO with core-cell were prepared by using of SiO2 particles as rigid template and the thermal reduction of the electrostatic assembled SiO2–GO hybrids, in which the inside rigid particles could support the uniform dispersion of ultrathin RGO sheets in the PVDF matrix and thus leading to a much lower percolation threshold (0.141 vol% for RGO in composite) than those of most reported graphene/polymer composites. Only a small amount of RGO in composites lead to high dielectric permittivity (72.94) and low dielectric loss (0.059) which should be ascribed to the increase of interfacial polarization between filler and matrix. More importantly, the composites with high breakdown strength (2438 kV/cm), energy density (0.301 J/cm3) and charge–discharge efficiency (91.2%) can be achieved by incorporation of 10 wt% filler loading. This study provides a special pathway to ensure the dispersion and highly efficient usage of ultrathin graphene sheets in the polymer matrix and achieve graphene/polymer composite with excellent dielectric performance and energy storage density.

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Acknowledgements

This work was financially supported by National Basic Research Program of China (973 Program, 2015CB057206), National Natural Science Foundation of China (21571186), Guangdong Innovative Research Team Program (Nos. 2011D052 and KYPT20121228160843692), “Guangdong TeZhi plan” Youth Talent of Science and Technology (2014TQ01C102), Shenzhen Basic Research Plan (JSGG20150512145714246 and JCYJ20140610152828685).

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Authors and Affiliations

  1. Shenzhen Institutes of Advanced Technology, Chinese Academy of Science, Shenzhen, 518055, People’s Republic of China

    Lulu Lv, Liang Huang, Pengli Zhu, Gang Li, Tao Zhao & Rong Sun

  2. Chengdu University of Technology, Chengdu, People’s Republic of China

    Lulu Lv & Jianping Long

  3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, USA

    Chingping Wong

  4. Department of Electronics Engineering, The Chinese University of Hong Kong, Hong Kong, People’s Republic of China

    Chingping Wong

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  1. Lulu Lv
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Correspondence to Pengli Zhu.

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Lv, L., Huang, L., Zhu, P. et al. SiO2 particle-supported ultrathin graphene hybrids/polyvinylidene fluoride composites with excellent dielectric performance and energy storage density. J Mater Sci: Mater Electron 28, 13521–13531 (2017). https://doi.org/10.1007/s10854-017-7191-0

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