Wide-bandgap fluorides/polyimide composites with enhanced energy storage properties at high temperatures

Li，Liuting1,2; Dong，Jiufeng1; Hu，Renchao1,2; Chen，Xianqiang1,2; Niu，Yujuan1,2; Wang，Hong1,2

2022-05-01

10.1016/j.cej.2022.135059

CHEMICAL ENGINEERING JOURNAL   影响因子和分区

1385-8947

1873-3212

In advanced electronics and electrical power systems, polymer dielectric capacitors are favored for their high power density and great reliability. However, the low energy density at high temperatures constrains their use in emerging applications. To address this vital issue, herein, a novel calcium fluoride (CaF) nanoparticle with a wide bandgap (∼12.1 eV) and moderate permittivity (∼10.0) is prepared by a simple direct precipitation method and then introduced into the polyimide (PI) matrix. The incorporation of the CaF nanoparticles increases the permittivity and reduces conduction loss simultaneously. Consequently, at 150 ℃, the PI film with 3 vol% CaF exhibits enhanced discharged energy density and breakdown field of 2.68 J cm and 455.4 MV m, respectively. Besides, the composite shows a higher power density of 0.36 MW cm and a faster discharge speed of 2.09 μs at 150 ℃ than that 2.93 μs of biaxially oriented polypropylene (BOPP) measured at 85 ℃. Notably, CaF nanofiller, as a deep trap, captures injected charges and alleviates the local electric distortion, as revealed by finite element simulation and thermally stimulated discharge current (TSDC) measurement. This work proposes a novel fluoride nanofiller to rationalize the energy storage improvement of high-temperature composites with potential wide application.

CaF2 nanoparticle Conduction loss Energy storage High-temperature Polymer nanocomposites

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[92066208] ; Shenzhen Science and Technology Program["KQTD20180411143514543","JCYJ20180504165831308"] ; Shenzhen DRC project[[2018] 1433] ; Guangdong Provincial Key Laboratory Program rom the Department of Science and Technology of Guangdong Province[2021B1212040001]

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:000773626600002

ELSEVIER SCIENCE SA

20220711625783

Calcium fluoride ; Electric power systems ; Energy gap ; Fluorspar ; Nanocomposites ; Nanoparticles ; Permittivity ; Polypropylenes ; Precipitation (chemical)

Minerals:482.2 ; Energy Storage:525.7 ; Electric Power Systems:706.1 ; Nanotechnology:761 ; Chemical Operations:802.3 ; Inorganic Compounds:804.2 ; Organic Polymers:815.1.1 ; Solid State Physics:933

ENGINEERING

2-s2.0-85124255078

Scopus

1.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices,Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,Southern University of Science and Technology,Shenzhen,518055,China

Li，Liuting,Dong，Jiufeng,Hu，Renchao,et al. Wide-bandgap fluorides/polyimide composites with enhanced energy storage properties at high temperatures[J]. CHEMICAL ENGINEERING JOURNAL,2022,435.

Li，Liuting,Dong，Jiufeng,Hu，Renchao,Chen，Xianqiang,Niu，Yujuan,&Wang，Hong.(2022).Wide-bandgap fluorides/polyimide composites with enhanced energy storage properties at high temperatures.CHEMICAL ENGINEERING JOURNAL,435.

Li，Liuting,et al."Wide-bandgap fluorides/polyimide composites with enhanced energy storage properties at high temperatures".CHEMICAL ENGINEERING JOURNAL 435(2022).