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- Title
Facile surface modification of fly ash to obtain flexible cellulose composite dielectric films with enhanced breakdown strength and energy storage density.
- Authors
Bao, Jiangkai; Lao, Jiaping; Hu, Yang; Song, Yiheng; Xu, Menghan; Niu, Fukun; Yang, Quanling; Xiong, Chuanxi; Shi, Zhuqun
- Abstract
Polymer-based dielectric films are in great demand for film capacitors. Cellulose, which is the most abundant natural polymer on Earth, has excellent mechanical properties, thermal stability, biodegradability, biocompatibility and is easy to obtain excellent dielectric properties by modification, making it promising for dielectric films. Here, we prepared regenerated cellulose (RC) dielectric films from NaOH/urea aqueous solution of cellulose. In order to further improve the dielectric properties of the RC films, industrial waste fly ash (FA) was coated with polydopamine (PDA) to obtain a low-cost and environmentally friendly dielectric filler (FA@PDA), which was then added to cellulose. FA@PDA effectively enhanced the dielectric properties of cellulose. When the content of FA@PDA reached 40 wt%, the composite films showed the best performance, with a breakdown strength of 260 MV m−1 and energy storage density of 2.57 J cm−3, which was about 8 times that of pure RC films. Moreover, by vacuum-pressure drying, the breakdown strength of the D-RC-FA@PDA40 composite films was increased to 330 MV m−1, and the maximum energy storage density reached 3.47 J cm−3. Concurrently, the composite films possessed excellent flexibility and thermal stability. This work is of great significance to the reuse of industrial waste residues and the development of environmentally friendly dielectric energy storage materials.
- Subjects
DIELECTRIC films; ENERGY storage; ENERGY density; FLY ash; CELLULOSE
- Publication
Cellulose, 2023, Vol 30, Issue 8, p5259
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-023-05208-6