期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 10, 期 46, 页码 17757-17767出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2tc03556a
关键词
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资金
- Hunan National Natural Science Foundation
- National Natural Science Foundation of China
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
- [2021JJ30652]
- [52002404]
By selecting a low-cost liquid crystal small molecule as the organic filler, a series of polyvinylidene fluoride-based composite films with high dielectric constant and discharge energy density are prepared through a simple solvent casting method.
It is an urgent issue to enhance the energy storage capacity of dielectric film capacitors for their miniaturization and integration into lightweight electronic devices under the premise of large-scale industrial production. In this work, via selecting a low-cost liquid crystal small molecule (4-cyano-4 '-pentylbiphenyl, denoted as 5CB) as the organic filler, a series of all-organic poly(vinylidene fluoride)-based (PVDF) composite films are prepared through a simple solvent casting method. The 5CB organic filler with high liquid mobility and strong polarity can mix and interact well with the PVDF matrix, thus forming dense and high-quality dielectric polymer films. As a result, the 5 wt% 5CB/PVDF composite exhibits the highest dielectric constant of 9.8 at 1 kHz because of its great dispersibility and strong interfacial polarization. More importantly, a maximum discharge energy density of 11.7 J cm(-3) is obtained due to the increased crystallinity, the formation of charge traps and enhanced mechanical properties, which is more than 3 times that of a pristine PVDF film (3.8 J cm(-3)). This work is viable for large-scale preparation of high performance flexible dielectric composites via a simple and inexpensive method.
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