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This study aims to enhance the dielectric energy storage performance of poly(vinylidene fluoride) (PVDF) composite dielectrics. A new type of all-organic composite dielectric film (P-M) was prepared by filling different mass fraction of poly(methyl methacrylate) (PMMA) into PVDF by simple physical blending. The electric strength, energy storage density, and energy efficiency of composite dielectric films were systematically evaluated. Combining theoretical calculations and experimental characterization, the mechanism of electrostatic interactions between PVDF and PMMA molecular chains on energy storage performance of composite dielectric films was analyzed. The results show that the electric strength of the PVDF-based composite dielectric films with a PMMA mass fraction of 40% (P-M40) is 856.2 kV/mm, which is 59.0% higher compared to that of pure PVDF. The maximum energy storage density (Ue) of the P-M40 composite dielectric film is as high as 17.2 J/cm3, which is 40.9% higher than that of pure PVDF, and the charging and discharging efficiency (η) reaches 72.5%. Theoretical calculation reveals that there is an electrostatic interaction between the PVDF and PMMA molecular chains, which can regulate the arrangement and crystallization behavior of the PVDF molecular chains. Fourier transform infrared spectroscopy and X-ray diffraction analysis reveal that the introduction of PMMA promots the formation of the low-loss α phase, inhibits the generation of the β phase, and reduces the grain size of PVDF. Scanning electron microscopy shows that the microstructure of the composite dielectric film is denser, and the physical defects such as internal pores significantly decrease. These structural changes increase the carrier transport barrier, suppress the leakage current and conductivity loss, and improve the breakdown and energy storage performance of the composite dielectric film.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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