PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 23
·13143-13153
·
IF 3.43
Pu Mao,Jiping Wang,Lixue Zhang,Qinzhao Sun,Xixia Liu,Liqiang He,Shujuan Liu,Siwen Zhang,Hao Gong
Polymer dielectrics with high dielectric performances and superior discharge energy capability are highly desirable for advanced electrostatic capacitor applications. However, the paradoxical relationship between dielectric polarization and electric breakdown behavior generally hinder their further enhancement in energy storage performances. Herein, polymer blended composite films with high energy storage capability were successfully fabricated by blending together poly(vinylidene fluoride) (PVDF) polymer and poly(vinylidene fluoride–trifluoroethylene–chlorofluoroethylene) (P(VDF–TrFE–CFE)) terpolymer. The P(VDF–TrFE–CFE) terpolymer has a high dielectric constant to provide a large electric displacement under an applied electric field far below its breakdown field, which is anticipated to modulate the dielectric polarization behavior of PVDF polymer when blended in different proportions. Consequently, the polymer blended composite film consisting of 20 wt% (P(VDF–TrFE–CFE)) terpolymer exhibits a high discharge energy density of 13.63 J cm−3 at an enhanced breakdown strength of 480 MV m−1. This obtained high discharge energy density is 84% higher than the pure PVDF film and 582% higher than a commercialized biaxially oriented polypropylene (BOPP). Large interfacial polarization and strong interaction of polymer chains between the PVDF polymer and P(VDF–TrFE–CFE) terpolymer may contribute to the tunable dielectric constant and electric breakdown strength, thus promoting the energy storage capability. This work establishes a facile, but effective approach to achieve the high energy storage capability of PVDF polymer-based flexible composite films for capacitive energy storage applications.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chen Huang,Lingyu Zhang,Song Liu,Yao Wang,Nü Wang,Yuan Deng
Encapsulating ferroelectric ceramic nanofillers into polymer matrix with various architectures has been demonstrated as an effective strategy for ultrahigh energy storage density. Nevertheless, large discrepancy in permittivities between ceramic fillers and polymer requires sophisticated interfacial modification to alleviate local charge concentration. The idea to design graded permittivity from the filler center to surrounding matrix in composites is promising, yet remains a big challenge. Here coaxial electrospinning technique has been employed to control the polarization gradient distribution in TiO 2 nanofibers (TO nf ) and poly(vinylidene fluoride)/poly(vinylidene fluoride-co-trifluoroethylene) [PVDF/P(VDF-TrFE)] core-shell structured hybrid nanocomposites system where TO nf is fixed at volume fraction 2%, and the polarization gradient of the polymer is adjusted via altering the volume ratios of PVDF and P(VDF-TrFE) in the coaxial electrospun polymer blends in two layers, respectively. Compared with nanocomposites made from mixed solution electrospun randomly and oriented TO nf -PVDF/P(VDF-TrFE) at the same constituent volume fraction, the dielectric losses of coaxial-spun films decrease more than twice, from 0.087 for random nanocomposite film to 0.028, and more intriguingly, the discharged energy storage density ( U e ) doubled increasing from 6.5 J cm −3 for random nanocomposite film to 12.7 J cm −3 for coaxial electrospun film with medium polarization gradient. Finite element analyses reveal the polarization and local electric field distribution in the nanocomposites with various polarization gradient design, and the results unambiguously demonstrate that U e can be significantly boosted via controlled polarization gradient design.
研究领域:
材料科学
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电气工程
·
纳米技术
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DOI
高影响因子
Energy Materials
·
2026
·Vol. 6
·期 6
·N
·
IF 11.9
Yabo Wu,Zhiqiang Zhang,Yihao Zhang,Zhaoxin Ma,Changji Deng,Song Zhang,Bowen Bai,Weicong Liu,Yifan Huang,Qingfeng Zhang,Yongming Hu
Polymer dielectrics are promising materials for electrostatic capacitors because of their high dielectric strength and fast charge-discharge capability. However, improving the energy-storage density of fluorinated ferroelectric polymers remains challenging because enhanced polarization is often accompanied by reduced breakdown strength. In this work, all-organic poly(vinylidene fluoride- trifluoroethylene-chlorofluoroethylene)/poly(methyl methacrylate) [P(VDF-TrFE-CFE)/PMMA] dielectric films are prepared by solution blending and casting. By tuning the blend ratio, the intermolecular interactions and crystallization behavior of the films are systematically regulated, resulting in distinct changes in their electrical properties. The results suggest that dipolar interactions between PMMA carbonyl groups and polar groups in P(VDF-TrFE-CFE) disturb chain packing and suppress crystallization, thereby reducing dielectric loss and improving breakdown stability. At the optimized composition, the P(VDF-TrFE-CFE)/PMMA (50/50 wt.%) film delivers a dischaged energy density of 17.12 J/cm3 with an energy-storage efficiency of 88.11%. Further γ-irradiation of the optimized film at doses of 10-150 kGy leads to additional improvement in dielectric energy-storage performance. These results demonstrate that regulating intermolecular interactions and crystalline morphology through all-organic blending and irradiation is an effective strategy for developing high-performance polymer dielectrics.
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 11
·1-13
·
IF 3.097
Liu Yuhang,Wen Youyi,Xu Weiwei,Li Bo,Song Zhimei,Li Yuyao,Xia Fang
The research on film capacitors with high energy density ( \({U}_{e}\) ) has attracted great attention in these years, due to their applications in modern electric system. However, the low \({U}_{e}\) is the major limitation for decreasing the size and weight of ferroelectric film capacitors. In this research, in order to improve the breakdown strength ( \({E}_{b}\) ) and dielectric constant at the same time, P(VDF-HFP) based ternary nanocomposites were prepared by using edge-hydroxyl boron nitride nanosheets (EOH-BNNSs) with high \({E}_{b}\) and the third phase filler with high dielectric constant. Three fillers with dielectric constant from large to small, namely, barium titanate (BT), titanium dioxide (TO), alumina (AO) were added into P(VDF-HFP)/EOH-BNNSs nanocomposites, respectively. The \({E}_{b}\) , dielectric constsnt, dielectric loss, \({U}_{e}\) , thermal conductivities and mechanical properties of the ternary nanocomposites were thoroughly investigated. The results indicate the local electric field concentration has great influence on the \({E}_{b}\) of ternary nanocomposites. However, with low filler loading, the synergy effect and weak local electric field concentration can not only improve the dielectric constant but also the \({E}_{b}\) , finally achieving the best \({U}_{e}\) . The easy preparation process and high \({U}_{e}\) have endow the ternary nanocomposites with great potential application in film capacitors.
研究领域:
材料科学
·
电气工程
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Yueyuan Liu,Feifei Wang,Xiaozhe Chen,Fuhui Cui,Yang Lu,Rongke Gao,Liandong Yu
The widespread application of Internet of Things (IoT) technology promotes the miniaturization and intelligent development of electronic devices, posing significant challenges to the effective microenergy harvesting and optimization of self-powered devices. Here, we present NaNbO3/P(VDF-TrFE)-based piezoelectric nanogenerators (NP-PENGs) based on femtosecond laser surface modification for bioenergy harvesting and human motion monitoring. In this study, NaNbO3 nanoparticles are synthesized by liquid-phase pulsed laser ablation, and the phase structure of P(VDF-TrFE)-based composite materials is processed by femtosecond laser surface modification. The aim is to establish a synergistic system of nanoparticle induction and laser precise control to enhance the content of the β-phase in three dimensions from nucleation initiation, orientation control, and structural stability. Importantly, the output potential of flexible P(VDF-TrFE) and 5 wt % NaNbO3/P(VDF-TrFE)-based PENGs after femtosecond laser processing can reach 26.1 V (36% improvement) and 40 V (52% improvement), respectively. Furthermore, the flexible PENG exhibits great stability under cyclic mechanical stress for 3000 s and successfully powers 20 LEDs. By attaching the NP-PENG to various parts of the human body, it can not only precisely sense human motion status but also real-time monitor the output voltage changes. This study provides an efficient and straightforward method for achieving precise control of high β-phase content and high-performance PENGs, and it demonstrates its enormous potential in the field of intelligent wearable devices.
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产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2026
·
IF 8.6
Tian Fang,Jiujun Zhu,Qixiong Zhang,Xiaopeng Li,Yafei Hou,Renlu Han,Jing Cuan,Weiping Li
Polymer dielectric capacitors are pivotal for advanced electronics, while their limited energy density ( U d ) impedes further miniaturization. Constrcution of nanocomposites to utilizing their both merits seems to improve their U d , however, conventional single-filler systems typically enhance either dielectric constant ( ε r ) or breakdown strength ( E b ), at the expense of the other. Herein,A dual-filler approach is developed to achieve concurrent enhancement of ε r and E b , thereby overcoming the trade-off limitation inherent in single-filler systems. In this study, a series of nanocomposites are designed by incorporating carbon quantum dots (C QDs) into a P(VDF-HFP) matrix with Ni(OH) 2 nanosheets (Ni(OH) 2 NSs). C QDs enhance ε r through the micro-capacitor effect and suppress electron migration via the Coulomb blockade effect. Concurrently, Ni(OH) 2 NSs act as scattering centers and barriers, extending the breakdown path to improve E b . Simulation results confirm synergistic suppression of electrical tree growth. The best nanocomposite obtains a U d of 21.9 J/cm 3 at 570.3 MV/m with charge-discharge efficiency ( η ) of 72.3%. This U d shows a 188% improvement over the single-filler counterpart. Meanwhile, excellent cyclic stability over 10 4 cycles and rapid discharge (τ 0.9 = 117 ns) are also demonstrated. This dual-filler system provides a rational route to concurrently improve ε r and E b for next-generation dielectric capacitors.
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DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2019
·Vol. 53
·期 5
·055504
·
IF 2.829
Shixin Wei,Qiong Fu,Yang Liu,Qian Ji,Yafei Hou,Laihui Luo,Weiping Li
An enhanced energy storage ability, under a low operating electric field, was achieved in Fe3O4@TiO2-P(VDF-HFP) composite films. The low conductivity TiO2 layer was coated onto the high polarization Fe3O4 to construct Fe3O4@TiO2 core–shell fillers for decreasing filler fraction and alleviating conductivity contrast. For instance, the 2 vol.% Fe3O4@TiO2-P(VDF-HFP) film shows a discharged energy density and energy efficiency of 8.6 J cm−3 and 61.7%, respectively, under a low operating electric field of 261.9 kV mm−1. The coated TiO2 and modified –OH groups not only restrict the adverse effects (such as high conductivity, easy agglomeration, etc) caused by Fe3O4, but also contribute greatly to the improvement of polarization and breakdown strength, leading to a significantly improved energy storage performance. Additionally, the present work might possess great potential applications for energy storage owing to the low filler fraction, simple, and low electric filed operation.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Bing Xie,Qi Zhang,Haibo Zhang,Guangzu Zhang,Shiyong Qiu,Shenglin Jiang
Uniform morphology BaTiO 3 nanowires with high aspect ratio (>100) were synthesized via a novel stirring hydrothermal method . The BaTiO 3 /P(VDF-CTFE) nanocomposite films were prepared by a simple solution casting method using dopamine modified BaTiO 3 nanowires as nanofillers and ferroelectric polymer P(VDF-CTFE) as matrix. A maximum dielectric displacement of 9 μC/cm 2 under the electric field of 3000 kV/cm was achieved for the nanocomposites with 3 vol% BaTiO 3 nanowires. These nanocomposites with dopamine modified BaTiO 3 nanowires also exhibit an enhanced energy density of 8.4 J/cm 3 at a relative low electric field of 2700 kV/cm. This energy density is 55% higher than that of the pure P(VDF-CTFE) (−5.4 J/cm 3 at 3600 kV/cm). Such significant enhancement in dielectric displacement and energy density is attributed to the combined effects of both surface modification by dopamine and the high aspect ratio of the BaTiO 3 nanowires. Our study has a promising commercial potential in practical application in the automobile and aerospace field, which require greater energy density with a lower operating voltage.
研究领域:
材料科学
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能源存储
·
高分子材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jinhong Huang,Youhao Liao,Guanjie Li,Ning Xu,Mengqing Xu,Weishan Li
The cyclic stability of traditional poly (vinylidenefluoride- co -hexafluoropropylene) (P(VdF-HFP)) and our newly developed poly (butyl methacrylate-acrylonitrile-styrene) (P(BMA-AN-St)) copolymer-based gel polymer electrolyte (GPE) must still be improved to satisfy the increasingly rigid demands of lithium ion batteries that have higher energy densities . Series ratios of P(VdF-HFP) and P(BMA-AN-St) blended membranes were prepared using an electrospinning method to compensate for the disadvantages of a single copolymer-based membrane. The results showed that the compositions of P(VdF-HFP) and P(BMA-AN-St) had sizeable effects on the physical and electrochemical characterization of GPE, in which the P4 membrane and the GPE blending ratio of P(VdF-HFP): P(BMA-AN-St) = 1: 4 had the best properties. Because the P4 membrane showed the best interconnected pore structure and highest porosity, the GPE exhibited the highest ionic conductivity , with a value of 1.4 × 10 −3 S cm −1 at ambient temperature. Due to the better compatibility of the P4-based GPE with a lithium anode and its considerably electrochemical stability, the LiNi 0.5 Mn 1.5 O 4 /GPE/Li coin cell had an excellent cyclic performance, in which a 98% capacity retention under a 1 C rate was maintained after 150 cycles compared to the coin cell that used a pure P(VdF-HFP)-based GPE that maintained 86% of its discharge capacity under the same test conditions. Furthermore, the acceptable rate characterization of the P4-based GPE was presented with a discharge capacity at a 5 C rate that retained 92% of its counterpart at 1 C .
研究领域:
材料科学
·
电化学
·
储能技术
·
高分子科学
·
锂离子电池
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 36
·12759-12768
·
IF 4.099
Kun Qian,Xuguang Lv,Sheng Chen,Hang Luo,Dou Zhang
Dielectric polymer-based nanocomposites have attracted significant attention in recent years for energy storage applications because of their potential high permittivity and breakdown strength. The coupling effect of a nanofiller/matrix interface plays a crucial role in the dielectric and electric properties of polymer-based nanocomposites. In this paper, three kinds of side-chain liquid crystalline fluoric-polymers, denoted as P-nF (n = 3, 5 or 7, which is the number of terminal fluoric groups), were grafted on the surface of BaTiO3 nanoparticles by a surface-initiated reversible-addition–fragmentation chain transfer polymerization method. The nanocomposite films were prepared via core–shell BaTiO3 nanoparticles dispersed in a poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) P(VDF-TrFE-CTFE) polymer matrix. The frequency dependent dielectric properties and energy storage capability of the polymer nanocomposites were studied. The results showed that the permittivity and energy densities of the polymer nanocomposites depended on the molecular structure of the modifier, especially the number of electron-rich fluoric groups. Firstly, all modified BaTiO3 nanoparticles were homogeneously dispersed in the polymer matrix, resulting in the polymer nanocomposites presenting a higher breakdown strength compared with the unmodified BaTiO3 nanoparticles. Secondly, the changes in the nanocomposites’ permittivity exhibited diversity for three modifiers due to many influential factors. Thirdly, compared with neat P(VDF-TrFE-CTFE), the discharge energy densities of the polymer nanocomposites are all significantly improved. The highest discharge energy densities of nanocomposites with 5 vol% P-3F@BT reached 14.5 J cm−3. These findings suggest that the optimal interfacial modifier should be carefully decided by combining various properties of the nanocomposites for energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Yin He,Jianjun Su,Xin Niu,Tianheng Jia,Xiaoxuan Xu,Wenjing Liang,Qi Wang,Hao Liu
Flexible sensors have significant application potential in various areas, such as wearable devices, medical condition monitoring, and smart materials. However, these sensors mostly require integrated external electrodes, resulting in complex structures that limit flexibility and integration. This study integrates an in situ functional core as the electrode and a nanofiber sheath that serves dually as the sensing layer and ion transport channel, thereby simplifying the structural complexity of conventional multilayer sensors. Through conjugated electrospinning, a corespun yarn ion sensor was fabricated using silver-plated yarn as the core and P(VDF-HFP)–IL nanofibers as the sheath, eliminating the need for external electrodes. The resulting sensor is capable of real-time, in situ detection of both pressure and temperature stimuli, with a pressure sensitivity of 2.30 kPa–1 within the range of 0–100 kPa and a temperature sensitivity of 0.517 °C–1 within the range of 24–55 °C. The pressure range is up to 700 kPa. Additionally, the sensor shows excellent cyclic stability (>4000 cycles) and moisture permeability. Using textile technology, the corespun yarn ion sensors can be woven into fabrics to achieve real-time mapping of electromyographic parameters through an electrical impedance tomography system.
研究领域:
材料科学
·
传感器技术
·
生物医学工程
·
纺织工程
·
电子工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Bing Xie,Tongtong Wang,Jinxia Cai,Qiuyu Zheng,Zhiyong Liu,Kun Guo,Pu Mao,Haibo Zhang,Shenglin Jiang
Polymer-based nanocomposites embedded high dielectric-constant (high- ε r ) ceramic fillers in high breakdown-strength (high- E b ) polymer matrix are extensively studied as the flexible dielectrics for high discharged-energy–density (high- U e ) film capacitors. Ferroelectric ceramics composition lying on the morphotropic phase boundary (MPB) show ultrahigh dielectric and polarization response, which as ceramic fillers, have great promise to enhance the U e of polymer/ceramic composites. Herein, high- ε r Pb(Zr 0.52 Ti 0.48 )O 3 (PZT) nanocubes (NCs) with MPB composition are prepared successfully via an improved hydrothermal reaction. Based on this, core–shell structured PZT@SiO 2 nanofillers are designed to reduce the uneven electric field distribution and leakage current in P(VDF-CTFE)-based nanocomposites for high E b . We demonstrate that the PZT@SiO 2 nanofillers with MPB composition can effectively resolve the paradox between ε r and E b . The prepared P(VDF-CTFE)/PZT@SiO 2 nanocomposites can display a high U e of 16.8 J/cm 3 at E b of 491 MV/m, which is substantially improved by 107% over the pristine P(VDF-CTFE). Plus, high discharging efficiency of 70% is also achieved. The superiority of the PZT@SiO 2 NCs with MPB in improving the capacitive energy density of film capacitors will be expected to provide a design paradigm for advanced polymer composites with high energy storage performance.
研究领域:
材料科学
·
能量存储
·
介电与绝缘材料
·
纳米复合材料
·
铁电材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）