Issue

Vol. 15 (2023)

A Bilayer High-Temperature Dielectric Film with Superior Breakdown Strength and Energy Storage Density

https://doi.org/10.1007/s40820-023-01121-6
Jiang‑Bo Ping
State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
Qi‑Kun Feng
State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
Yong‑Xin Zhang
State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
Xin‑Jie Wang
State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
Lei Huang
State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
Shao‑Long Zhong
State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
Zhi‑Min Dang
State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China

Corresponding Author: Zhi‑Min Dang

dangzm@tsinghua.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 154

Abstract

The further electrification of various fields in production and daily life makes it a topic worthy of exploration to improve the performance of capacitors for a long time, including thin-film capacitors. The discharge energy density of thin-film capacitors that serves as one of the important types directly depends on electric field strength and the dielectric constant of the insulation material. However, it has long been a great challenge to improve the breakdown strength and dielectric constant simultaneously. Considering that boron nitride nanosheets (BNNS) possess superior insulation and thermal conductivity owing to wide band gap and 2-dimensional structure, a bilayer polymer film is prepared via coating BNNS by solution casting on surface of polyethylene terephthalate (PET) films. By revealing the bandgap and insulating behavior with UV absorption spectrum, leakage current, and finite element calculation, it is manifested that nanocoating contributes to enhance the bandgap of polymer films, thereby suppressing the charge injection by redirecting their transport from electrodes. Worthy to note that an ultrahigh breakdown field strength (~ 736 MV m−1), an excellent discharge energy density (~ 8.77 J cm−3) and a prominent charge–discharge efficiency (~ 96.51%) are achieved concurrently, which is ascribed to the contribution of BNNS ultrathin layer. In addition, the modified PET films also have superior comprehensive performance at high temperatures (~ 120 °C). The materials and methods here selected are easily accessible and facile, which are suitable for large-scale roll-to-roll process production, and are of certain significance to explore the methods about film modification suitable for commercial promotion.


Highlights:


1 A bilayer dielectric film is prepared via coating boron nitride nanosheets (BNNSs) by solution casting on the surface of polyethylene terephthalate (PET) film.
2 The BNNS layer acts as the efficient barrier layer to suppress the charge injection, thereby making the surface-modified PET films exhibit excellent breakdown strength and electrostatic energy storage performance.
3 The surface coating methods are accessible and suitable for large-scale roll-to-roll process production of dielectric films.

Keywords

Film capacitor Dielectric property Boron nitride nanosheets Surface coating Energy storage characteristics
Ping, Jiang‑Bo, Qi‑Kun Feng, Yong‑Xin Zhang, Xin‑Jie Wang, Lei Huang, Shao‑Long Zhong, and Zhi‑Min Dang. 2023. “A Bilayer High-Temperature Dielectric Film With Superior Breakdown Strength and Energy Storage Density”. Nano-Micro Letters 15 (June):154. https://doi.org/10.1007/s40820-023-01121-6.
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