Scalable Polyimide‐Poly(Amic Acid) Copolymer Based Nanocomposites for High‐Temperature Capacitive Energy Storage

Abstract

The developments of next‐generation electric power systems and electronics demand for high temperature (≈150 °C), high energy density, high efficiency, scalable, and low‐cost polymer‐based dielectric capacitors are still scarce. Here, the nanocomposites based on polyimide‐poly(amic acid) copolymers with a very low amount of boron nitride nanosheets are designed and synthesized. Under the actual working condition in hybrid electric vehicles of 200 MV m−1 and 150 °C, a high energy density of 1.38 J cm−3 with an efficiency higher than 96% is achieved. This is about 2.5 times higher than the room temperature energy density (≈0.39 J cm−3 under 200 MV m−1) of the commercially used biaxially oriented polypropylene, the benchmark of dielectric polymer. Especially, the energy density and efficiency at 150 °C show no sign of degradation after 20 000 cycles of charge‐discharge test and 35 days’ high‐temperature endurance test. This research provides an effective and low‐cost strategy to develop high‐temperature polymer‐based capacitors.

Modulating the charge trapping characteristics of PEI/BNNPs dilute nanocomposite for improved high-temperature energy storage performance

“…9 Therefore, it is extremely desired to exploit dielectrics with high electrostatic energy storage density and high-temperature resistance. 10 Generally, the electric displacement ( D ) of dielectrics and the applied external electric field ( E ) jointly determine the discharged energy density ( U e ), 11 which can be described by . Since the permittivity of linear dielectrics doesn’t change with the electric field, the formula can be converted to , where ε 0 is the vacuum permittivity (8.85 × 10 −12 F m −1 ).…”

Ultrahigh energy storage performance of all-organic dielectrics at high-temperature by tuning the density and location of traps

“…3,10 Recent developments in transportation electrification and power electronics for harsh environments ( e.g. , electronics in aerospace and subsurface oil and gas exploration systems) have created a great demand for polymer dielectrics with high-temperature energy storage density and efficiency, 3,11–13 which will play a crucial role in the future generation of state-of-the-art electronic and power systems.…”

“…25 However, at higher temperatures (>150 °C), the effectiveness of this method is greatly reduced. 4 For the second method, the effective means include introducing highly insulating nanoparticles (such as SiO 2 , 28 HfO 2 , 29 Al 2 O 3 , 29 BNNS 12 ) into the matrix, the construction of multi-layer structures, 9 etc. In addition, a recently emerging approach is to introduce deep traps.…”

Polyimide Nanodielectrics Doped with Ultralow Content of MgO Nanoparticles for High-Temperature Energy Storage

“…To address the conduction loss issue of polymer dielectrics at high temperatures, plenty of strategies have been attempted in the past few decades [ 11 , 12 , 13 , 14 , 15 ]. Polymer–oxide composites are a very interesting and important research topic with various applications [ 16 , 17 ].…”