Enhanced Energy Storage Performance Research Articles

Enhanced energy storage performance of 0.88(0.65Bi0.5Na0.5TiO3-0.35SrTiO3)-0.12Bi(Mg0.5Hf0.5)O3 lead-free relaxor ceramic by composition design strategy

Dielectric ceramic capacitors with high energy density are one of the great bright energy storage devices. Here, the Bi0.5Na0.5TiO3, 0.75Bi0.5Na0.5TiO3-0.25SrTiO3, 0.65Bi0.5Na0.5TiO3-0.35SrTiO3 and 0.88(0.65Bi0.5Na0.5TiO3-0.35SrTiO3)-0.12Bi(Mg0.5Hf0.5)O3, (abbreviated as BNT, BNT-25ST, BNT-35ST and BNST-BMH, respectively) ceramics were produced by solid state sintering method. The influence of solid solution of SrTiO3 and Bi(Mg0.5Hf0.5)O3 doping in Bi0.5Na0.5TiO3 on crystal structure, microstructure, electrical and energy storage performance were evaluated systematically. By optimizing ceramics composition, high breakdown field and slim hysteresis loops were simultaneously realized due to enhanced band gap, refined grain size and nano-domains formed, which can be verified by the transmission electron microscope (TEM), piezoelectric force microscope (PFM) and ultraviolet–visible spectrum. Therefore, an ultrahigh recoverable energy density of 5.59 J/cm3 with brilliant efficiency of 85.3% is realized in BNST-BMH ceramic. Besides, the BNST-BMH also exhibits prominent temperature stability at 20–140 °C, superior fatigue resistance beyond 105 cycles and outstanding frequency stability at 1–200 Hz. Our work offers a novel way for designing dielectric capacitors and also proves that BNST-BMH is indeed a great hopeful dielectric energy storage material in pulse power electronics.

Enhanced energy storage performance and magnetocapacitance effect of polycrystalline BiFeO3 ceramics

Enhanced energy storage performance and magnetocapacitance effect of polycrystalline BiFeO3 ceramics

Efficiently enhanced energy storage performance of Ba2Bi4Ti5O18 film by co-doping Fe3+ and Ta5+ ion with larger radius

We present an efficient strategy, that is the co-substitution of Fe3+ and Ta5+ ions with large radius for Ti4+ ion, to enhance energy storage performance of Ba2Bi4Ti5O18 film. For the films co-doped with Fe3+ and Ta5+ ions, the maximum polarization under the same external electric field is improved because the radius of Fe3+ and Ta5+ ions is larger than that of Ti4+ ion. Moreover, due to the composition and chemical disorder, the relaxor properties are also slightly improved, which can not be achieved by the film doped with Fe3+ ions only. What is more, for the films doped with Fe3+ ion only, the leakage current density increases greatly due to the charge imbalance, resulting in a significant decrease in breakdown strength. It is worth mentioning that the breakdown strength of Fe3+ and Ta5+ ions co-doped film does not decrease due to the charge balance. Another important point is the recoverable energy storage density of the films co-doped with Fe3+ and Ta5+ ions has been greatly improved based on the fact that the maximum external electric field does not decrease and the maximum polarization under the same external electric field increases. On top of that, the hysteresis of the polarization has also been improved. Finally, the co-doped films with Fe3+ and Ta5+ ions have good frequency and temperature stability.

Research on structure and properties of MWCNT@PDA/polymer matrix composite films with enhanced energy storage performance

AbstractMWCNT@PDA/PVDF‐TrFE and MWCNT@PDA/PVDF‐TrFE‐CTFE composite films with high dielectric constant, low dielectric loss and excellent energy storage density were prepared by solution casting method. The best component of composite film (2.0 wt% MWCNT@PDA/PVDF‐TrFE‐CTFE, named C) was selected as the middle layer of the sandwich structure, and the upper and lower layers were made up by pure PVDF‐TrFE film (named A) and pure PVDF‐TrFE‐CTFE films (named B). By testing and comparing the microstructure and performance of the single‐layer composite film and the sandwich structure composite film, the influence of the matrix and structure on the performance of the composite film was discussed. The results showed that the dispersion effect of the filler in the matrix became worse, the dielectric constant gradually increased, the dielectric loss of the composite film did not change significantly, and the energy storage density first increased and then decreased with the increasing of the filler content. At a frequency of 103 Hz, the dielectric constants of 2.0 wt% MWCNT@PDA/PVDF‐TrFE and 2.0 wt% MWCNT@PDA/PVDF‐TrFE‐CTFE composite films were 9.00 and 13.88, which were 1.9 and 2.9 times of pure films. When the electric field was 1100 kV/cm, the energy storage density of composite film BCB was 6.36 times of film C.

Nonsolid TiOx Nanoparticles/PVDF Nanocomposite for Improved Energy Storage Performance.

Nanofiller/polymer nanocomposites are promising dielectrics for energy harvesting to be applied in wearable and flexible electronics. The structural design of the nanofillers plays a vital role to improve the energy storage performance of the related nanocomposites. Here, we fabricate a flexible device based on nonsolid titanium oxide (TiOx) nanoparticles/poly(vinylidene fluoride) (PVDF) to achieve enhanced energy storage performance at low loading. The room-temperature oxidation method is used to oxidize two-dimensional MXene (Ti3C2Tx) flakes to form partially hollow TiOx nanoparticles. Taking advantage of this structure, the flexible TiOx nanoparticles/PVDF nanocomposite with an ultralow loading content of 1 wt % nanofillers shows high energy storage performance, including a dielectric constant of ≈22 at 1 kHz, a breakdown strength of ≈480 MV m-1, and an energy storage density of 7.43 J cm-3. The finite element simulation further reveals that the optimization of the energy storage performance is ascribed to the lower electric potential among the partially hollow TiOx nanoparticles, which enhances the breakdown strength of the nanocomposites. This work opens a new avenue to structurally design and fabricate low-loading polymer-based nanocomposites for energy storage applications in next-generation flexible electronics.

The preparation of MnO2-doped NaNbO3-based lead-free ceramics with enhanced energy storage performance and attractive electrocaloric effect

MnO2-doped 0.955NaNbO3-0.045La(Nb1/3Mg2/3)O3 ceramics were prepared through a conventional method. The effects of MnO2 amount on the dielectric property, and the phase transition behavior and energy storage performance were studied. The introduction of MnO2 can obviously improve sintering performance and effectively stabilize anti-ferroelectric phase, accompanied with the variation of phase transition temperature. An enhanced recoverable energy storage density of 2.63 J·cm−3 with efficiency of 66.8% was obtained at RT when 1.5% MnO2 was applied. This sample also demonstrated attractive thermal stability in energy storage from 30 °C–90 °C. In addition, the coexistence of positive and negative electrocaloric effect was observed due to the emergence of anti-ferroelectric phase. A further advantage of the thermal hysteresis phenomenon possesses abilities to enhance dielectric and energy storage properties. This will contribute to the promotion of NaNbO3-based lead-free dielectric capacitors.

Enhanced energy storage performance in (1-x)Bi0.85Sm0.15FeO3-xCa0.5Sr0.5Ti0.9Zr0.1O3 relaxor ceramics

Producing dielectric ceramics with favorable energy storage density, efficiency, and thermal stability has become an urgent task for developing energy storage devices. In this work, the innovative Pb-free (1-x)Bi0.85Sm0.15FeO3-xCa0.5Sr0.5Ti0.9Zr0.1O3 [(1-x)BSF-xCSTZ, x = 0.0, 0.1, 0.2, 0.3 and 0.4] ceramics were fabricated via traditional solid phase sintering approach. Their structures, electrical characteristics, and energy storage properties were researched comprehensively. The results verified that all the samples form solid solutions with pseudo-cubic perovskites structure. The density of ceramic samples is improved accompanied by gradually refined grain size upon increasing the CSTZ doping content. Interestingly, an excellent recoverable density of ∼3.3 J/cm3 with high efficiency of ∼78% is received at x = 0.3 under the average breakdown electric field of 350 kV/cm. The energy storage performances remained stable in a broad temperature range of 20 – 110 ℃, a large frequency range of 1 Hz – 1 kHz, and beyond 105 repeated charging-discharging cycles. The enhanced energy storage performances of BSF ceramics by introducing CSTZ result from the improved relaxor behavior and the increased electric breakdown strength. Our strategy for relaxor modulation with a sealed sintering method to achieve high energy storage performance can be valuable in BiFeO3-based ceramic capacitors.

Fabrication of Mn3O4-WO3 nanoparticles based nanocomposites symmetric supercapacitor device for enhanced energy storage performance under neutral electrolyte

Development of pseudocapacitive electrode materials with wide potential windows is the major challenge for supercapacitor application to overcome the critical energy crisis. In this consequence, we have prepared Mn3O4-WO3 nanoparticles based nanocomposite with the variable stoichiometric amount of Mn sources via the one-pot solvothermal method. Among all the synthesized nanocomposite and bare samples, Mn3O4-WO3 (10:1) nanoparticles nanocomposite pursue excellent specific capacitance in three and two-electrode systems. In a three-electrode system the synthesized Mn3O4-WO3 (10:1) nanoparticles nanocomposite displays maximum specific capacitance 358 F g−1 using a neutral electrolyte with a wide working potential window. The electrokinetic analysis of the synthesized Mn3O4-WO3 (10:1) nanoparticles nanocomposite has been predominant capacitive contribution over the charge storage. Further the fabricated symmetric supercapacitor device (SSD) using Mn3O4-WO3 (10:1) nanocomposite pursues the maximum specific capacitance 101 F g−1 along with the energy density of 56.11 Wh kg−1 and power density 5 kW kg−1. Moreover the fabricated device of the synthesized Mn3O4-WO3 (10:1) nanocomposite demonstrates outstanding durability which has 95.5% specific capacitance retention upto 5000 continuous charge-discharge cycles. The improved stability and higher electrochemical activity are due to the nanocomposite effect, high pore volume and surface area, and low charge transfer resistance of the synthesized Mn3O4-WO3 (10:1) nanocomposite.

High energy storage capacity, heterogeneous domain structure and stabilization of intermediate phase in PbZrO3-based antiferroelectric single crystals

Enhanced energy storage performance together with improved permittivity and polarization has been achieved in lead zirconate PbZrO3-based antiferroelectric single crystals.

Enhanced energy storage performance in Na(1-3x)BixNb0.85Ta0.15O3 relaxor ferroelectric ceramics

High-performance lead-free dielectric containers have excellent energy storage performance such as higher power density and energy density. While being eco-friendly materials, lead-free dielectric materials are more suitable for pulse power systems than other dielectric materials. In this study, Ta 5+ and Bi 3+ ions were introduced into the A site and B site of the NaNbO 3 matrix. The introduction of Bi 3+ ions induced the formation of a vacancy in the A site, yielding Na (1-3 x ) Bi x Nb 0.85 Ta 0.15 O 3 (NBNT, x = 0.05, 0.08, 0.11, 0.14) ceramics. The recoverable energy density ( W rec ) and the energy storage efficiency ( η ) were highest for the Na 0.67 Bi 0.11 Nb 0.85 Ta 0.15 O 3 ceramic, with values of 3.37 J/cm 3 and 89% respectively. Batteries employing the Na 0.67 Bi 0.11 Nb 0.85 Ta 0.15 O 3 ceramic achieved a current density of 830.4 A/cm 2 , an energy density of 49.8 MW/cm 3 and 60.2 ns discharge time. These results show that the Na 0.67 Bi 0.11 Nb 0.85 Ta 0.15 O 3 ceramic is an effective energy storage material with broad application prospects.

Enhanced Energy Storage Performance and Theoretical Understanding of the Dielectric Breakdown Behavior for Ba0.4sr0.6tio3/Al2o3 Ceramics

Enhanced Energy Storage Performance and Theoretical Understanding of the Dielectric Breakdown Behavior for Ba0.4sr0.6tio3/Al2o3 Ceramics

Enhanced Energy-Storage Performance in Silver Niobate-Based Dielectric Ceramics Sintered at Low Temperature

Enhanced Energy-Storage Performance in Silver Niobate-Based Dielectric Ceramics Sintered at Low Temperature

Enhanced Energy Storage Performance of (Ba0.85ca0.15) (Zr0.10ti0.90)-Based Ceramics Through a Synergistic Optimization Strategy

Enhanced Energy Storage Performance of (Ba0.85ca0.15) (Zr0.10ti0.90)-Based Ceramics Through a Synergistic Optimization Strategy

CrSe2/Ti3C2 MXene 2D/2D hybrids as promising candidates for energy storage applications

A 2D/2D hybrid structure of CrSe2/MXene based supercapacitor exhibited enhanced energy storage performance with a long cyclic stability.

Enhanced energy storage performance of poly(vinylidene fluoride)-based polymer blends via post-treatments

Polymer-based dielectric composite films with large energy density are urgently demanded for various applications. Compared with the ones with inorganic fillers, polymer blends exhibit the advantage of mechanical matching as well as the interfacial compatibility. Herein, poly(vinylidene fluoride) (PVDF) composite films with various volume fractions of methyl methacrylate-butadiene-styrene (MBS) were prepared via the solution casting. The maximum energy density of 6.4 J/cm3 at 390 MV/m was obtained by optimizing the content of 12 vol% MBS in MBS/PVDF composite films. The energy density of the optimized composite films was further improved with the help of post-treatments including quenching and/or hot-pressing. At last, the composite films display the enhanced energy density of 8.7 J/cm3 at 500 MV/m with the efficiency of 67.4% via the comprehensive post-treatments. This work provides a paradigm to improve the energy storage performance of PVDF-based composite films for dielectric electrostatic capacitors.

N, O Co-Doped Mesoporous Coal-Derived Carbon Material with Enhanced Energy Storage Performance for Supercapacitors

N, O Co-Doped Mesoporous Coal-Derived Carbon Material with Enhanced Energy Storage Performance for Supercapacitors

Enhanced recoverable energy storage density and efficiency in (1 − x)Ba0.85Ca0.15Zr0.1Ti0.9O3-xSrTiO3-MnO2 lead-free ceramics

Realizing enhanced energy storage performance by introducing SrTiO3 (ST) to Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT).

Enhancing energy storage performances in an ultra-wide temperature range via interface engineering and thermal management for silicon-integrated dielectric capacitors

High-performance silicon-integrated dielectric thin film capacitors with superior thermal stability are strongly attractive for application in integrated circuits and electronic devices. Here, by combining interface engineering with thermal management, lead-free 0.85BaTiO3-0.15Bi(Mg0.5Zr0.5)O3 (BT-BMZ) dielectric thin film capacitors were integrated on Si, HfO2-buffered Si (HfO2/Si), and graphene-buffered HfO2/Si (G/HfO2/Si) substrates. Benefiting from not only high-quality interface between HfO2 and Si but also the heat dissipation effect of the graphene layer, an ultra-high energy storage density up to 102 J/cm3 with an efficiency of 74.57% was obtained in BT-BMZ/G/HfO2/Si at room temperature. More importantly, the optimized capacitor exhibited an ultra-stable energy density of 52.1 J/cm3 (±10%) with high efficiency (over 70%) in a wide temperature range of –100 to 175 °C, greatly broadening the working temperature in comparison to BT-BMZ/Si (–100 to 100 °C). The present research provides a scalable strategy to enhance energy storage performance of dielectric capacitors, especially at elevated temperatures.

Enhanced energy storage performance of eco-friendly BNT-based relaxor ferroelectric ceramics via polarization mismatch-reestablishment and viscous polymer process

In this work, we synthesized a novel and eco-friendly relaxor ferroelectric system, i.e., (1−x)(0.8Bi0.5Na0.4K0.1TiO3-0.2SrTiO3)-xNaNbO3 (BS-xNN) ceramics with x = 0.1–0.4 based on a solid state reaction technique. The structural, microstructural, dielectric as well as ferroelectric characteristics of BS-xNN ceramics were comprehensively examined. According to our findings, the Ti–O coupling reduces as the NN content increases, while the Nb–O coupling strengthens, leading in a nano-scale polarization mismatch-reestablishment process that enhances energy storage performance. Because of the reduction in thickness and porosity, the viscous polymer process significantly increases the breakdown strength of ceramic samples. More crucially, at 260 kV/cm, 0.6BS-0.4NN ceramics have an ultrahigh recoverable energy storage density Wrec of 4.44 J/cm3 and a high energy storage efficiency η of 81.8%. Furthermore, thermal stability of energy storage performance is also identified across a wide temperature range of 30 °C from 140 °C at 215 kV/cm. The higher performance of energy storage not only indicates the feasibility of our technique, but also serves as a model for the manufacturing of high-quality dielectric ceramics with a wide range of industrial applications.

Enhanced energy storage performance of PVDF composite films with Na0.5Bi0.5TiO3 particles

Enhanced energy storage performance of PVDF composite films with Na0.5Bi0.5TiO3 particles