Pulsed Capacitors Research Articles

Synergistic modulation of ferroelectric polarization and relaxor behavior of Sr2NaNb5O15‐based tungsten bronze ceramic

AbstractDeveloping dielectric ceramics with high energy storage performance (ESP) is essential for miniaturizing and integrating high‐power pulse capacitors. Sr2NaNb5O15‐based tungsten bronze ferroelectric ceramics have been highly investigated for dielectric energy storage applications recently. However, the difficulty in concurrently obtaining large polarization and strong relaxor characteristics greatly hinders the ESP improvement. In this work, Bi3+ and Ti4+ ions were introduced into the Sr2NaNb5O15 ceramic, aiming to modulate the ferroelectric polarization and relaxor behavior synergistically. An excellent recoverable energy density (Wrec ∼ 4.08 J/cm3) and a high efficiency (η ∼ 84.59%) were concurrently attained in the Sr1.85Bi0.15NaNb4.85Ti0.15O15 composition due to the boosted polarization and enhanced relaxor nature. Moreover, this ceramic also exhibited a high current density (863.06 A/cm2) and a large power density (94.94 MW/cm3). All these characteristics demonstrate that the Bi3+ and Ti4+ ions co‐doped Sr2NaNb5O15 ceramics possess great potential for dielectric capacitor applications.

Analysis and Design Considerations of Input Parallel Output Series-Phase Shifted Full Bridge Converter for a High-Voltage Capacitor Charging Power Supply System

Capacitor charging power supply (CCPS) is used for impulse-power applications such as electromagnetic rail guns, flash lamps, medical sterilization, and rock crushing, among many other application fields. This paper describes the design and analysis of an Input Parallel Output Series-Phase Shifted Full Bridge converter for CCPS. The proposed system has a low output current ripple to improve the lifetime of the high-voltage pulsed capacitor. Design considerations of topology's electrical parameters such as HF transformer's leakage inductor and output inductor for the CCPS application are presented. The intermediate DC-link capacitance is provided as an energy storage element to minimize the disturbances (power variation) on the source for the CCPS application. Analysis and sizing of the capacitance for two different charging methods are analyzed and compared. A controller design procedure for the Active Front End Converter (AFEC) is also included to ensure near-constant power drawn, rejecting the load disturbances. Finally, a complete design procedure for the whole CCPS system is presented. Design and simulation results are presented for a rated system, followed by experimental results from a scaled-down hardware prototype to validate the design.

Ultra‐high power density in poly(arylene ether nitrile)‐based composites containing barium titanate and boron nitride nanosheets

AbstractBarium titanate (BT) nanoparticles were surface coated by a silane coupling agent (KH550) and core–shell structured nanoparticles (named KH550@BT) were obtained. Similarly, BT nanoparticles coated by polydopamine (PDA) were named as PDA@BT. Meanwhile, boron nitride (BN) nanosheets (BNNS) were successfully unstripped from block BN. Then, two kinds of ternary poly(arylene ether nitrile) (PEN)‐based composites are prepared using the solution casting method. Composites with 30 wt% KH550@BT and 12 wt% BNNS were named as KH550@BT/BNNS/PEN. Composites with 30 wt% PDA@BT and 12 wt% BNNS were named as PDA@BT/BNNS/PEN. The microstructure, dielectric properties, and energy storage properties of the ternary composites were studied in detail. PEN embedded with either BNNS or BT were prepared and studied for comparison. As a result, the introduction of BT will improve the dielectric constant (εr) and energy storage density (W), but it will reduce the breakdown strength (Eb) and charge–discharge efficiency (η) of composites. BNNS not only improves Eb and W but also improves η of composites. Although the introduction of BT and BNNS simultaneously may reduce η, it will improve εr, Eb, and W of composites. Most importantly, the fast discharge speed and high power density demonstrate that the BT/BNNS/PEN composites are potential candidates to be used in high power pulsed capacitors fields.Highlights Boron nitride nanosheets improve the breakdown strength of composites. The composites achieve simultaneous increment of εr and Eb. The power density of the BT/BNNS/PEN composites was higher than 70 MW cm−3.

Properties of PBZTS Ferroelectric Ceramics Obtained Using Spark Plasma Sintering.

In this paper, spark plasma sintering was used to obtain and investigate (Pb0.97Ba0.03)(Zr0.98Ti0.02)1-xSnxO3 (PBZTS) ceramic materials for x = 0, 0.02, 0.04, 0.06, and 0.08. Crystal structure, microstructure, dielectric and ferroelectric properties, and electrical conductivity tests of a series of samples were carried out. The SPS sintering method ensures favorable dielectric and ferroelectric properties of PBZTS ceramic materials. X-ray studies have shown that the material has a perovskite structure. The samples have a densely packed material structure with properly crystallized grains. The fine-grained microstructure of the PZBZTS material with high grain homogeneity allows the application of higher electric fields. Ceramic samples obtained by the SPS method have higher density values than samples obtained by the classical method (FS). The permittivity at room temperature is in the range of 245-282, while at the phase transition temperature is in the range of 10,259-12,221. At room temperature, dielectric loss factor values range from 0.006 to 0.036. The hysteresis loops of PBZTS ceramics have a shape typical for ferroelectric hard materials, and the remnant polarization values range from 0.32 to 0.39 µC/cm2. The activation energy Ea values of the PBZTS samples result mainly from the presence of oxygen vacancies. The PZT material doped with Ba and Sn and sintered via the SPS method has favorable physical parameters for applications in modern devices such as actuators or pulse capacitors.

Evolution of underwater shock wave in far-field regime of electrical wire explosion system over wide range of electric pulse energy

The parametric relationships between underwater shock waves (SWs) in far-field regime and electrically exploded wire under different charging voltages of a generator are investigated. Contributions of the vaporization and current restrike to the resulting SWs have been examined by means of electro-physical diagnostics, free-field pressure probe, and high-speed photography. In the experiment, a 6-μF pulse capacitor is adopted to provide a microsecond timescale pulsed current, exploding a 90/185-μm-diameter, 2-cm-long copper wire with the charging voltage ranging from 7.1 kV (stored energy ∼ 150 J) to 18.3 kV (∼1000 J). Experimental results indicate that as the increase of the charging voltage, the relationship between electro-physical and shock wave parameters shows a rather complex situation. When the charging voltage ranging from 7.1 kV (∼150 J) to 11.6 kV (∼400 J), the peak pressure of SWs (300 mm away from the explosion source) increases almost linearly from 1.16 ± 0.03 to 2.24 ± 0.05 MPa (90-μm wire), and 1.67 ± 0.17 to 2.87 ± 0.12 MPa (185-μm wire). Nevertheless, at a higher charging voltage between 11.6 kV (400 J) to 14.1 kV (600 J), the peak pressure stabilizes in a strange “plateau”. Until the residual energy after the explosion is sufficiently large (>600 J in this study) to induce a strong current restrike, the development of the plasma channel could further enhance the expansion of explosion products, as well as the intensity of measured SWs. In addition, high-speed photography has been applied for those explosions, providing the information of plasma channel expansion and initial SWs propagation.

Energy storage in epitaxial multilayered BiFeO3/Na0.5Bi0.5TiO3/La0.7Sr0.3MnO3 thin films

Lead-free dielectric film capacitors with fast charge-discharge rates are ideal for pulsed power capacitors, but their energy storage density lags behind. Lead-free epitaxial multilayered BiFeO3 (BFO)/Na0.5Bi0.5TiO3 (NBT)/La0.7Sr0.3MnO3 (LSMO) films were designed and fabricated by solution processing and the effects of bottom electrodes as well as BFO thickness on microstructures, electrical properties and energy storage performances were investigated. Compared with the NBT film on Pt/Ti/SiO2/Si substrate, the leakage current densities are significantly suppressed and polarizations are obviously improved for the multilayered BFO/NBT/LSMO films. The BFO/NBT/LSMO film with BFO thickness of about 60 nm exhibits a recoverable energy storage density of 37.0 J/cm3 under 2680 kV/cm and excellent performance stability. These results demonstrate that the epitaxial multilayered BFO/NBT/LSMO films are promising candidates for high-power energy storage applications.

Achieving high energy density, ultralow dielectric loss and ultrahigh hardness in environmentally friendly Ba0.39Sr0.61Nb2O6-based glass ceramics

In this study, Ba2O-Na2O-SrO-Nb2O5-TeO2-B2O3 (BNSN-TB) glass ceramics (GCs) were prepared using the melt-annealing and heat treatment methods. The sample was crystallized at 670 ℃ for 2 h to obtain the Ba0.39Sr0.61Nb2O6 GCs, exhibiting an ultrahigh hardness (Hv) of 8.82 GPa. The first-principles calculations demonstrate that Ba0.39Sr0.61Nb2O6 has a lager band gap compared to BaNb2O6, which could favor the increase in the high breakdown strength (BDS). The simulation model explains how the small grains can withstand high BDS. GCs sample heated at 670 ℃ can achieve a large recoverable energy storage density (Wrec) of 2.38 J/cm3 and an ultrahigh energy efficiency (η) of 90.2%. Additionally, the GCs sample can attain an actual discharge energy density (Wd) of 1.78 J/cm3 and a power density (Pd) of 268 MW/cm3. These results demonstrate that the GCs possess a great potential for pulsed energy-storage capacitor applications.

Enhanced Energy Storage Performance and Efficiency in Bi0.5(Na0.8K0.2)0.5TiO3-Bi0.2Sr0.7TiO3 Relaxor Ferroelectric Ceramics via Domain Engineering.

Dielectric materials are highly desired for pulsed power capacitors due to their ultra-fast charge-discharge rate and excellent fatigue behavior. Nevertheless, the low energy storage density caused by the low breakdown strength has been the main challenge for practical applications. Herein, we report the electric energy storage properties of (1 - x) Bi0.5(Na0.8K0.2)0.5TiO3-xBi0.2Sr0.7TiO3 (BNKT-BST; x = 0.15-0.50) relaxor ferroelectric ceramics that are enhanced via a domain engineering method. A rhombohedral-tetragonal phase, the formation of highly dynamic PNRs, and a dense microstructure are confirmed from XRD, Raman vibrational spectra, and microscopic investigations. The relative dielectric permittivity (2664 at 1 kHz) and loss factor (0.058) were gradually improved with BST (x = 0.45). The incorporation of BST into BNKT can disturb the long-range ferroelectric order, lowering the dielectric maximum temperature Tm and inducing the formation of highly dynamic polar nano-regions. In addition, the Tm shifts toward a high temperature with frequency and a diffuse phase transition, indicating relaxor ferroelectric characteristics of BNKT-BST ceramics, which is confirmed by the modified Curie-Weiss law. The rhombohedral-tetragonal phase, fine grain size, and lowered Tm with relaxor properties synergistically contribute to a high Pmax and low Pr, improving the breakdown strength with BST and resulting in a high recoverable energy density Wrec of 0.81 J/cm3 and a high energy efficiency η of 86.95% at 90 kV/cm for x = 0.45.

Lead-free X8R-type 0.92Ba0.8Sr0.2TiO3-0.08Bi(Mg0.5Zr0.5)O3 dielectric energy-storage ceramics for pulsed power capacitors

Lead-free X8R-type 0.92Ba0.8Sr0.2TiO3-0.08Bi(Mg0.5Zr0.5)O3 dielectric energy-storage ceramics for pulsed power capacitors

The impact of oxygen partial pressure in modifying energy storage property of lanthanum doped multiferroic bismuth ferrite thin films deposited via pulsed laser deposition

Lead-free dielectric thin films' potential as pulse capacitors in power electronic devices has garnered attention to their energy storage usage. The current study aims at the growth of multiferroic thin films using the pulsed laser deposition technique for energy storage capacitor applications. Under various OPPs, single-phase La-doped bismuth ferrite (Bi0.993La0.007FeO3) BLFO thin film of 200 nm thickness is deposited on quartz and n-type Si substrates (15 to 30 SCCM). The crystal planes (110) and (006) of the rhombohedral phase with space group R3c are confirmed by high-resolution HRTEM and SAED patterns that augmented the XRD analysis. The optimized films have a smooth, uniform microstructure with 3 nm root-mean-square (RMS) roughness. The film shows an enhanced dielectric constant of 447 at room temperature with an improved ferroelectric property. At 488 kV/cm, the 20 SCCM BLFO films achieved 78.42 % energy efficiency and 2.09 J/cm3 energy density. The same films also exhibited a lower value of bandgap energy, confirming the strong absorption at 452 nm wavelength. The relatively high refractive index of 2.78 is determined for the same film suggesting the higher crystallinity of the film. Further, the low magnitude of leakage current density of the grown film is ∼10−7 A/cm2 at ±100 kV/cm. Though achieving the pure phase and fabricating BLFO thin films is challenging, these results are appropriate for the thin films to realize as energy storage capacitor applications.

Pulse shape discrimination and spectral performance of an inverted coaxial point contact HPGe detector with sub-pF capacitance

The inverted coaxial point contact high purity germanium (ICPC HPGe) detector exhibits the advantages of large volume, low depletion voltage, small capacitance, and excellent pulse shape discrimination (PSD) capability. An ICPC detector prototype with 0.9 pF capacitance was successfully fabricated and tested in this study using two different front-end electronics. The detector weighted approximately 1.5 kg and the depletion voltage was only 1800 V. The optimized operating voltage was found to be 2500 V and the leakage current was 7 pA. The detector was first connected to a homemade JFET based front-end with a pulsed reset design to minimize parallel noise. An energy resolution of 1.72 keV (full width at half maximum) was achieved at 1332 keV, demonstrating the good charge collection efficiency of the detector. An RC feedback front-end circuit was employed to test the PSD properties using a 228Th source. The PSD capability is similar to that of typical broad energy or point contact HPGe detectors, but is notably improved when the charge trapping is corrected using the drift time.

Giant Energy Storage Density with Antiferroelectric-Like Properties in BNT-Based Ceramics via Phase Structure Engineering.

Driven by the information industry, advanced electronic devices require dielectric materials which combine both excellent energy storage properties and high temperature stability. These requirements hold the most promise for ceramic capacitors. Among these, the modulated Bi0.5 Na0.5 TiO3 (BNT)-based ceramics can demonstrate favorable energy storage properties with antiferroelectric-like properties, simultaneously, attaching superior temperature stability resulted from the high Curie temperature. Inspired by the above properties, a strategy is proposed to modulate antiferroelectric-like properties via introducing Ca0.7 La0.2 TiO3 (CLT) into Bi0.395 Na0.325 Sr0.245 TiO3 (BNST) ((1-x)BNST-xCLT, x = 0.10, 0.15, 0.20, 0.25). Combining both orthorhombic phase and defect dipole designs successfully achieve antiferroelectric-like properties in BNST-CLT ceramics. The results illustrate that 0.8BNST-0.2CLT presents superior recoverable energy storage density ≈8.3 J cm-3 with the ideal η ≈ 80% at 660kV cm-1 . Structural characterizations demonstrate that there is the intermediate modulated phase with the coexistence of the antiferroelectric and ferroelectric phases. In addition, in situ temperature measurements prove that BNST-CLT ceramics exhibit favorable temperature stability over a wide temperature range. The present work illustrates that BNT-based ceramics with antiferroelectric-like properties can effectively enhance the energy storage performance, which provides novel perspectives for the subsequent development of advanced pulsed capacitors.

Stabilizing polar P21ma phase in Bi0.5Na0.5TiO3-Na0.91Bi0.09Nb0.94Mg0.06O3 relaxors by CaTiO3 additive to promote energy storage density, efficiency and discharge rate

Eco-friendly Bi0.5Na0.5TiO3 relaxor ferroelectric has attracted considerable attention for pulsed power capacitor applications due to its large saturation polarization. However, high remnant polarization and low breakdown strength (Eb) restrict its application. Herein, linear dielectric CaTiO3 (CT) is introduced into Bi0.5Na0.5TiO3-Na0.91Bi0.09Nb0.94Mg0.06O3 (BNT-NBNM) ceramic to enhance its Eb. Interestingly, CT additive can stabilize polar orthorhombic P21ma phase. As a result, a high recoverable energy density of 6.4 J/cm3 and a high efficiency of 92% at 400 kV/cm as well as an ultrafast discharge rate of 57 ns are obtained in 0.63BNT-0.27NBNM-0.1CT ceramic. Furthermore, temperature dependent Raman spectra reveal that the superior temperature stability of energy storage properties over the temperature span of 30–150 °C is due to insensitive B-O vibration to temperature. The results demonstrate an effective strategy to construct superior and stable BNT-based energy storage materials for pulsed power capacitor applications.

Improved energy storage performance of Bi(Mg0.5Ti0.5)O3 modified Ba0.55Sr0.45TiO3 lead-free ceramics for pulsed power capacitors

(1–x)Ba0.55Sr0.45TiO3–xBi(Mg0.5Ti0.5)O3 (x = 0, 0.08, 0.1, 0.12, 0.15, 0.2) ceramics were fabricated via a solid-state reaction route. The ultrahigh recoverable energy density (Wrec = 4.05 J cm−3), efficiency (η = 78%), maximum polarization (Pmax = 51.40 μC cm−2), and high dielectric breakdown strength (BDS = 230 kV cm−1) were achieved for the 0.9BST−0.1BMT ceramic. The fast discharge rate (t0.9∼0.14 μs), current density (CD∼637.02 A cm−2), high power density (PD∼38.70 MW cm−3), good temperature stability (20−180 °C), frequency stability (10−500 Hz), and fatigue endurance for cycling (105) of 0.9BST−0.1BMT ceramic make it suitable for the development of energy-storage devices. The relaxor behavior with a high Wrec (3.06 J cm−3) and η (93%) at BDS (220 kV cm−1) was also achieved for the 0.8BST−0.2BMT ceramic. This study systematically investigates the correlation among the structural, dielectric, impedance, and energy storage properties of BMT-doped BST ceramics.

Research on Excitation Control and Energy Feedback Control of Brushless Doubly‐Fed Air‐Core Pulse Alternator

Brushless doubly‐fed air‐core pulse alternator (BDAPA) is a new type of pulse alternator. It does not need a brush and slip ring, improving the reliability of the system. Moreover, the field winding and rotor winding have good compensation effect, which can significantly improve the discharge performance of the pulse alternator. As a high‐power pulse power supply, BDAPA must have a set of corresponding excitation power supplies to control its excitation. Pulse alternator and excitation power supply constitute the pulse alternator power supply system. The excitation power supply of pulse alternator usually adopts a pulse capacitor, the field winding of pulse alternator is excited by the pre‐charged capacitor before the pulse alternator discharges the load. After discharging, the excitation capacitor must be charged again before the next work of pulse alternator. This requires an additional set of DC power supply to charge the excitation capacitor. It not only increases the volume of the whole system and reduces the energy storage density of the system, but also makes the control of the system more complex. Taking the BDAPA as the research object, this paper proposes a control method with energy feedback, which is combining self‐excitation and separate excitation. Using the inertial energy storage of the pulse alternator and the inductive energy storage of the field winding and rotor winding, the excitation capacitor can be recharged through proper control methods, which can save the DC excitation power supply and improve the energy storage density of the system. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

Enhanced photoelectric properties for BiZn0.5Zr0.5O3 modified KNN-based lead-free ceramics

With the increasing demand for transparent pulse capacitors and elector-optical multifunctional devices, the environmental-friendly K0.5Na0.5NbO3(KNN) based transparent dielectric ceramic has attracted extensive attention, not only for its superior energy storage properties but also for its good optical transparency. However, simultaneously improving the electrical and optical properties of KNN-based ceramics is still challenging. In this study, a new design strategy is proposed to enhance the electrical and optical properties of KNN-based ceramics. The strategy is reducing the grain size, breaking the long-range polar ordering to form disordered polar nanoregions (PNRs), and increasing the bandgap energy. The results showed that high effective storage (Wrec = 2.56 J/cm2) and energy storage efficiency (η = 93 %) are achieved, and the bandgap reaches 3.16 eV and optical transmittance of 73 % at the wavelength of 1200 nm and 67 % at the wavelength of 800 nm simultaneously implemented in the (1-x)K0.5Na0.5NbO3-xBiZn0.5Zr0.5O3((1-x)KNN-xBZZ) ceramics. The design strategy strategies proposed in this study provide a novel way to improve the electrical and optical properties of transparent pulse capacitors.

High energy storage performance in Sr0.64Bi0.18Na0.18TiO3-ZnO hybrid solid solution ceramics

Ceramic-based capacitors with excellent recoverable energy storage density (Wrec) and efficiency (η) are greatly desired for pulsed capacitors but challenge as well. In this work, the high energy storage performance with an Wrec of 5.1 J/cm3, an η of 93.4%, and an ultrafast discharge–charge speed t0.9 of 72 ns is achieved in unusual interstitial and substitutional hybrid solid solution of Sr0.64Bi0.18Na0.18TiO3-ZnO (SBNT-Zn), in which two Zn2+ ions occupy one A-site, while one Zn2+ ion occupies one B-site of ABO3 perovskite lattice simultaneously. The addition of Zn2+ increases lattice distortion and breaks long-range ferroelectric order, resulting in more highly dynamic polar nanoregions, higher relaxation behaviors as well as larger polarization (ΔP). Moreover, the extraordinary hybrid solid solution configuration enhances the bandgap of SBNT-Zn and ZnO as a sintering aid refines grain size, both help to enhance electric breakdown strength. This work affirms the feasibility and reliability of forming a hybrid solid solution to develop high-performance ferroelectric materials.

Lead-free KNN-based ceramics incorporated with Bi(Zn2/3Nb1/3)O3 possessing excellent optical transmittance and superior energy storage density

The application of lead-free dielectric ceramics for energy storage has received extensive attention because of their remarkable potential as pulse capacitors in power electronic devices. The current study developed a strategy for improving the energy storage performance of (K0.5Na0.5)NbO3 (KNN)-based ceramics by incorporating Bi(Zn2/3Nb1/3)O3 to reduce grain size, increase dielectric breakdown strength, and enhance ferroelectric relaxation degree. The resulting 0.87KNN–0.13BZN ceramics exhibited a high energy density (7.4 J/cm3) and moderate energy efficiency (74%) at an ultrahigh electric field (750 kV/cm) as well as excellent optical properties. Therefore, the 0.87KNN–0.13BZN ceramic is a promising candidate for pulse capacitors, providing a feasible approach for the development of new lead-free energy storage materials.

BS 0.5BNT-based relaxor ferroelectric ceramic/glass–ceramic composites for energy storage

Relaxor ferroelectric ceramics have very high dielectric constant (<i>ε</i>_r) but relatively low electrical breakdown strength (<i>E</i>_b), while glass–ceramics exhibit higher <i>E</i>_b due to the more uniformly dispersed amorphous phases and submicrocrystals/nanocrystals inside. How to effectively combine the advantages of both relaxor ferroelectric ceramics and glass–ceramics is of great significance for the development of new dielectric materials with high energy storage performance. In this work, we firstly prepared BaO–SrO–Bi₂O₃–Na₂O–TiO₂–Al₂O₃–SiO₂ (abbreviated as GS) glass powders, and then fabricated (Ba_0.3Sr_0.7)_0.5(Bi_0.5Na_0.5)_0.5TiO₃ + <i>x</i> wt% GS ceramic composites (abbreviated as BS_0.5BNT–<i>x</i>GS, <i>x</i> = 0, 2, 6, 10, 14, 16, and 18). Submicrocrystals/nanocrystals with a similar composition to BS_0.5BNT were crystalized from the glass, ensuring the formation of uniform core–shell structure in BS_0.5BNT–<i>x</i>GS relaxor ferroelectric ceramic/glass–ceramic composites. When the addition amount of GS was 14 wt%, the composite possessed both high <i>ε</i>_r (&gt; 3200 at 1 kHz) and high <i>E</i>_b (≈ 170 kV/cm) at room temperature, and their recoverable energy storage density and efficiency were <i>W</i>_rec = 2.1 J/cm³ and <i>η</i> = 65.2%, respectively. The BS_0.5BNT–14GS composite also had several attractive properties such as good temperature, frequency, cycle stability, and fast charge–discharge speed. This work provides insights into the relaxor ceramic/glass–ceramic composites for pulsed power capacitors and sheds light on the utilization of the hybrid systems.

Gold Sputtering at the Interfaces: An Easily Operated Strategy for Enhancing the Energy Storage Capability of Laminated Polymer Dielectrics

Polymers with excellent dielectric properties are strongly desired for pulsed power film capacitors. However, the adverse coupling between the dielectric constant and breakdown strength greatly limits the energy storage capability of polymers. In this work, we report an easily operated method to solve this problem via sputtering the interface of bilayer polymer films with ultralow content of gold nanoparticles. Interestingly, the gold nanoparticles can effectively block the movement of charge carriers because of the Coulomb blocking effect, yielding significantly enhanced breakdown strength. Meanwhile, the gold nanoparticles can act as electrodes to form numerous equivalent microcapacitors, resulting in an obviously enhanced dielectric constant. Impressively, the polymer film with merely 0.01 vol % gold nanoparticles exhibits an obvious dielectric constant and breakdown strength, which are 129 and 131% that of the pristine polymer film, respectively. Consequently, a high energy density which is 176% of that of the pristine polymer film is achieved, and a high efficiency of 79.2% is maintained. Moreover, this process can be well combined with the production process of commercial dielectric polymer films, which is beneficial for mass production. This work offers an easily operated way to improve the dielectric capacitive energy storage properties of polymers, which could also be applicable to other materials, such as ceramics and composites.