Enhanced dielectric property and energy storage density of PVDF-HFP based dielectric composites by incorporation of silver nanoparticles-decorated exfoliated montmorillonite nanoplatelets. (May 2018)

• Record Type: Journal Article
• Authors: Wang, Huan; Xie, Haian; Wang, Shan; Gao, Zhaodongfang; Li, Chuanbin; Hu, Guo-Hua; Xiong, Chuanxi
• Is Part Of: Composites. Volume 108(2018)
• Page Start: 62
• Page End: 68
• Publication Date: 2018-05
• Subjects: Montmorillonite nanoplatelet -- Dielectric constant -- Breakdown strength -- Energy density; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2018.02.020
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: Dielectric constant and breakdown strength are two key factors influencing the energy density of a dielectric material. This paper reports a promising strategy to increase both the dielectric constant and breakdown strength of the PVDF-HFP upon incorporating a low content of silver-deposited exfoliated montmorillonite nanoplatelets (Ag-OMMT). Incorporation of the Ag-OMMT nanoplatelets forms a large number of nanocapacitors, resulting in more interfacial polarization compared to the bare PVDF-HFP under the same applied electric field. Meanwhile, the OMMT nanoplatelets act as the insulating barriers, increasing the breakdown strength of the PVDF-HFP. Consequently, great improvements in the energy storage density are achieved in these dielectric composites. The PVDF-HFP/Ag-OMMT composite film with 4 vol% Ag-OMMT shows an energy density of 10.51 J cm −3 at 400 MV m −1, which is ∼ 2.25 times that of the pure PVDF-HFP film.