All-Organic Polymer Dielectric Materials for Advanced Dielectric Capacitors: Theory, Property, Modified Design and Future Prospects

Depressing relaxation and conduction loss of polar polymer materials by inserting bulky charge traps for superior energy storage performance in high-pulse energy storage capacitor applications

“…Unlike the high e r , which relies on the ferroelectric phase in PVDF, many polymers bearing scattered polar units possess a much larger e r than BOPP, and have attracted extensive attention as well. 12,20,21 Driven by an external electric field, the polarization of the polar units or the dipoles may contribute both high e r (3)(4)(5)(6)(7)(8) and U e (over 6 J cm À3 ) as desired. However, the depolarization of the aligned dipoles after the removal of the electric field takes much longer than allowed, which leads to a large amount of stored energy being unrecoverable or large U l (ca.…”

“…Hence, enhancing either ε r or E b is an effective strategy to increase the U e of dielectrics and their capacitors. Meanwhile, as presented in eqn (2), 3 energy loss ( U l ) is another dominating factor of capacitors, whose value is inversely proportional to the discharging efficiency ( η ). To overcome the low U e disadvantage of BOPP induced by small ε r , over the past few decades, considerable efforts have been devoted to investigating the energy storage performance of polar polymers bearing either a high polar ferroelectric phase represented by poly(vinylidene fluoride) (PVDF)-based ferroelectric polymers or randomly scattered dipoles such as poly(methyl methacrylate) (PMMA), P(VDF-TrFE-CTFE)- g -PVA, P(MMA-St) or P(AN-St).…”

“…The energy density of metalized film capacitors has to be significantly increased to meet the requirements of electric systems and instruments for enhanced capacity and reduced volume. [1][2][3][4] As the core unit of energy storage equipment, a high voltage pulse capacitor plays an indispensable role in the field of electric power systems and electromagnetic energy related instruments. [5][6][7] The most commonly utilized polymer dielectrics are metalized polymer films, which are represented by biaxially oriented polypropylene (BOPP) films, with advantages including low cost, high breakdown strength, excellent processing ability, and self-healing performance.…”

Research progress of intrinsic polymer dielectrics with high permittivity

“…The fundamental nature of the dipole moment change lies in the degree of separation or alteration in the vector angle between the centres of positive and negative charges, which can arise from local electron or charged atomic group deflections or the deflection of ion pairs. As a rule, researchers will classify polarisation types into the following five categories based on the region where the polarisation occurs: interfacial polarisation (10 −3 -10 2 Hz), ionic polarisation (~10 2 Hz), dipolar polarisation (1−10 8 Hz), atomic polarisation (10 11 −10 14 Hz), and electronic polarisation (10 14 −10 16 Hz) [26,27]. Another classification method based on the charge movement mechanism classifies polarisation into distortion polarisation, which arises from electron cloud distortion, displacement polarisation, which results from charge displacement; and steering polarisation, which occurs due to dipole deflection [28].…”

Carboxylated Poly (p‐Phenylene Terephthalamide) Reinforced Polyetherimide for High‐Temperature Dielectric Energy Storage

“…[25,26] Therefore, researchers are increasingly turning their attention to all-organic polymer dielectrics. [27][28][29][30][31][32][33] It is of great significance to seek organic fillers with thermal stability, high dielectric constant and low loss to meet the demand of harsh environments such as high temperature and high electric field applications.…”