Alicyclic polyimides with large band gaps exhibit superior high-temperature capacitive energy storage

Abstract

Flexible polymer dielectrics for capacitive energy storage that can function well at elevated temperatures are increasingly in demand for continuously advancing and miniaturizing electrical devices. However, traditional high-resistant polymer dielectrics...

Engineering Poly(phthalazinone ether sulfone) Dielectric Films for Stable High-Temperature Capacitive Energy Storage

“…It is well-established that leakage current density in polymer dielectrics is intricately linked to their breakdown properties, indicating the behaviors of transport of mobile charge carriers in the dielectric prior to breakdown. 33 As demonstrated in Figure 5b, at room temperature, the leakage current density (J) of the polymer film was examined across a range from 0 to 100 MV/m. The leakage current of PPES was significantly lower than that of PSF.…”

Intrinsic-designed polyimide dielectric materials with large energy storage density and discharge efficiency at harsh ultra-high temperatures

“…Due to the possibility of molecular tailoring and structural design of PI molecules, it is believed that introduction of highly polar groups into the PI backbone to induce its dipole polarization and adjust the dipole density of the material is a reasonable and feasible approach to enhance the discharge energy storage of film capacitors. 25 In this work, a new diamine monomer containing cyanogroup structure (-CN), namely bis(2-cyano-4-aminophenyl)amine, was successfully synthesized. Thereafter, three different chain length dianhydride monomers were applied to synthesize a series of cyano-group containing polyimides (CPIs).…”

“…Due to the possibility of molecular tailoring and structural design of PI molecules, it is believed that introduction of highly polar groups into the PI backbone to induce its dipole polarization and adjust the dipole density of the material is a reasonable and feasible approach to enhance the discharge energy storage of film capacitors. 25…”

Ultrahigh energy storage capacity in multilayer-structured cellulose-based dielectric capacitors caused by interfacial polarization-coupled Schottky barrier height

“…After all, the all-alicyclic polyimide delivered an ESD of 5.01 J cm −3 at 200 °C. 15 What can be seen from these two aspects is that the development of flexible energy storage capacitors has significant development in recent years; however, the abovementioned polymers are all derived from petroleum-based chemicals, which have the inevitable drawbacks of high cost, poor biocompatibility, and non-renewability. 16,17 The degradation of such materials is also harmful to the environment since lots of organic solvents are needed.…”