提高PVDF基有机-无机柔性复合膜储能密度的研究新进展

doi:10.11896/cldb.20060264

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Abstract With the development of miniaturized and multifunctional devices, flexible energy storage devices play an important role in electronic power systems. Dielectric capacitors have attracted immense interest due to their long cycle life and high-power density. However, low energy density limits their wide applications. Organic-inorganic composite,one of the most important flexible energy storage materials, combines the flexibility of organic dielectrics with the high dielectric constant of inorganic dielectrics. Particularly, polyvinylidene fluoride (PVDF)-based organic-inorganic composite energy storage dielectrics have received extensive attention. Firstly, in terms of the types of inorganic fillers, the inorganic fillers in PVDF-based composite materials include ceramic powders, semiconductor powders and conductor powders. Ceramic fillers have high dielectric constant, low dielectric loss, but poor compatibility with PVDF, therefore, the interface compatibility generally needs be improved by surface mo-dification. Semiconductor and conductor fillers can significantly enhance the dielectric constant of PVDF-based composites, thereby improving energy density. However, conductive path is easily formed by an improper conductor filler adding amount, leading to the preparation failure of dielectric energy storage materials. Secondly, as to the filler morphology, different morphologies for the one filler material have different effects on the energy storage of composites. 0D nanoparticles facilitate to form a uniform dispersed system in polymer matrix. Generally, there is a maximum value of the energy storage density of composites with the increased filler amount. With the decrease of particle size, the electric field distribution is more uniform, which can further improve the breakdown strength and the energy storage density of composites. The use of 1D nanofibers and 2D nanosheets is beneficial to increase polarization, and the breakdown strength of composite can be enhanced by varying breakdown path in electric field, thus improving energy storage density. Eventually, the layer design of composite structure is very effective to improve energy storage density and energy storage efficiency. Monolayer composite has to sacrifice breakdown strength to increase its dielectric constant, resulting in a limited improvement of energy storage density. Bilayer, sandwich and multilayer structure can simultaneously realize high dielectric constant and high breakdown strength depending on the stack of the high polarization layer with high dielectric constant and the insulation layer with high breakdown strength, which effectively improves energy storage density. It's significant for energy storage of flexible devices to research organic-inorga-nic composite. In the future we need to develop some composites with high energy storage density and low cost. The improvement of process controllability and development of technological process are also necessary to mass production.

Key words： dielectric dielectric constant energy storage density breakdown strength composite material

Published: 10 December 2021 Online: 2021-12-23

CLC number:

TB33

Fund:Natural Science Basic Research Program of Shaanxi(2021JZ-44)

Corresponding Authors: zhaolili@nwu.edu.cn

About author: Jingru Zhang received her B.E. degree from Northwest University in 2019. She is currently pursuing her master degree at School of Information Science & Technology, Northwest University under the supervision of Prof. Lili Zhao. Her research has focused on organic-inorganic flexible dielectric energy storage composite.
Lili Zhao is currently a full professor in Northwest University. Her research interests are thin film materials and devices, nano-materials and devices and new electronic ceramics and devices. She studied at the University of Florida and North Carolina State University. She has completed more than 10 projects including National Na-tural Science Foundation of China, Science and Technology development Plan of Shaanxi Province and Natural Science Foundation of Shaanxi Province. She published more than 60 academic papers and obtained 10 national patent authorizations.

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	ZHANG Jingru
	ZHANG Zhi'ang
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	XU Ruoxin
	ZHAO Lili

Cite this article:

ZHANG Jingru,ZHANG Zhi'ang,HAN Xiao, et al. Research Progress in Improving the Energy Storage Density of PVDF-based Organic-Inorganic Flexible Composite Films[J]. Materials Reports, 2021, 35(23): 23162-23170.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20060264 OR http://www.mater-rep.com/EN/Y2021/V35/I23/23162

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