Significantly Improved High‐Temperature Energy Storage Performance of BOPP Films by Coating Nanoscale Inorganic Layer

Abstract

Biaxially oriented polypropylene (BOPP) is one of the most commonly used commercial capacitor films, but its upper operating temperature is below 105 °C due to the sharply increased electrical conduction loss at high temperature. In this study, growing an inorganic nanoscale coating layer onto the BOPP film's surface is proposed to suppress electrical conduction loss at high temperature, as well as increase its upper operating temperature. Four kinds of inorganic coating layers that have different energy band structure and dielectric property are grown onto the both surface of BOPP films, respectively. The effect of inorganic coating layer on the high‐temperature energy storage performance has been systematically investigated. The favorable coating layer materials and appropriate thickness enable the BOPP films to have a significant improvement in high‐temperature energy storage performance. Specifically, when the aluminum nitride (AlN) acts as a coating layer, the AlN‐BOPP‐AlN sandwich‐structured films possess a discharged energy density of 1.5 J cm−3 with an efficiency of 90% at 125 °C, accompanying an outstandingly cyclic property. Both the discharged energy density and operation temperature are significantly enhanced, indicating that this efficient and facile method provides an important reference to improve the high‐temperature energy storage performance of polymer‐based dielectric films.

Bio-Based Poly(hydroxy urethane)s for Efficient Organic High-Power Energy Storage

“…Furthermore, the low dielectric losses in PHU6, combined with reduced conduction losses (Figure S5), induce a highly efficient discharge process, with a remarkably high efficiency, η = 85%, measured in the bio-based PHU at E b , which is much higher than the efficiencies typically measured in high-performance fluorinated polymers, with η < 70% as shown in Figure . − For a more reliable field of operation, E ∼ 0.5 E b (235 MV·m –1 ), η = 91% was measured in PHU6. This remarkable efficiency ranks among the best reported values intrinsically measured on linear dielectrics, including biaxially oriented polypropylene ,− and dipolar glasses (DG). ,,− With the exception of BOPP, the performances reported in Figure were limited to intrinsically measured materials at E b . We excluded polymers subjected to material processing or device architecture specifically dedicated to high-field applications (sandwich multilayers, stretching, cross-linking, nanocomposites, etc.)…”

“…These results highlight the importance of tuning the glass transition temperature in order to keep it well over the temperature range of interest, in order to minimize the energy dissipated during the discharge process, through the suppression of electronic and ionic conductions in the glassy state. The position of T g is all the more important for high-temperature applications ( T > 100 °C), such as inverters in electric vehicles, which have recently garnered significant attention. ,,,− While the PHUs presented here are not suitable for applications where T > 50 °C, the wide variety of available precursors (i.e., polyamines and polycarbonates) to access this family of materials can also offer high-temperature solutions. The use of a more rigid bio-based diamine, such as isophorone diamine (IPDA), could significantly increase the T g , with reported values up to 140 °C, , while remaining 100% bio-based and still benefiting from the highly polar hydroxy urethane group.…”

Design and characterization of molecular, crystal and interfacial structures of PVDF-based dielectric nanocomposites for electric energy storage

“…16(a). Liang et al 174 characterized the nanoparticles of different samples by scanning probe microscopy and nano-infrared spectroscopy. Nano-IR mappings at 1288 cm À1 of samples at interfaces are presented in Fig.…”

2D‐Nanofiller‐Based Polymer Nanocomposites for Capacitive Energy Storage Applications

“…In addition, the charge-discharge efficiency of polymer dielectric films rapidly decreases under high electric fields and high temperatures due to an increase in leakage current. [22] On contrary, ceramic-based capacitors have relatively low breakdown voltages as a result of their high permittivity. Inorganic nanoparticles are typically added to polymers to increase their permittivity.…”