ACS Applied Energy Materials
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2022
·
IF 6.959
Qinzhao Sun,Bofeng Shi,Tianran Zhang,Weijie Yang,Jiping Wang,Lixue Zhang,Dezhen Xue,Zepeng Wang,Fang Kang,Xiaoxiao Zhang
Dielectric capacitors with a high energy-storage density and efficiency are urgently required for miniaturization and integration of power electronics and pulsed power system. Herein, single-layered stretched P(VDF-HFP) with a certain content of poly(methyl methacrylate) (PMMA) and two kinds of sandwich-structured films are prepared to optimize and compare energy-storage performance. The results revealed that the crystallization transition behavior of stretched P(VDF-HFP) films contributed to enhance its electric polarization, while the introduction of linear type PMMA resulted in an enhancement of voltage tolerance of stretched films by improving the mechanical properties and suppressing leakage current. What’s more, the effects of crystalline orientations and structure design on the breakdown mechanism of stretched films were revealed by finite element theoretical simulation. As a consequence, the stretched sandwich-structured 0-25-0-S (pure P(VDF-HFP) serves as the outer layer, and blends represent the middle layer; the digit representing PMMA content in the P(VDF-HFP)) displayed a high Ue of 28.71 J/cm3 and η of 74% under 680 MV/m. This work provides a workable and effective method for developing capacitive films with great energy-storage performance.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2025
·
IF 4.9
Zhang Siqi,Wu Shu,Li Jinglei,Wang Qi,Yang Bowen,Guan Mengxiang,Peng Guirong,Zhao Xiaojia
The ferroelectric polymer PVDF and its copolymer have garnered significant attention in the field of dielectric energy storage due to their high permittivity and high breakdown strength. However, their high dielectric loss limits their application in the field of energy storage. Thus, reducing the dielectric loss of films while maintaining a high permittivity presents a challenge. In this paper, NiBDC and CuBDC were synthesized via solvothermal method and added into P(VDF-HFP) films, respectively. The effect of MOFs on the structure and dielectric properties of P(VDF-HFP) films were investigated. The results showed that the addition of MOFs could significantly increase the crystallization temperature while decreasing crystallinity and crystal size of the films. Tanδ decreased from 0.059 to 0.042 (10 k Hz, 18 °C) for the film with 10% CuBDC addition as coordinatively unsaturated metal centers in MOFs acted as electron traps that reduced tanδ and conductivity of the films. In addition, for the film with 1% CuBDC, the breakdown strength increased from 341.5 MV/m to 369.5 MV/m, the efficiency of the films increased from 87.7 to 93.9%.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 13
·3046
·
IF 3.1
Xiang Ke,Lifang Deng,Yanping Wang,Kai Tang,Lei Xiao,Gazi Hao,Peili Li,Xiang Zhou
Strengthening the interfacial contact between the reactive components effectively boosts the energy release of energetic materials. In this study, we aimed to create a close-knit interfacial contact condition between aluminum nanoparticles (Al NPs) and Polyvinylidene fluoride-hexafluoropropylene (P(VDF-HFP)) through hydrolytic adsorption and assembling 1H, 1H, 2H, 2H-Perfluorododecyltrichlorosilane (FTCS) on the surface of Al NPs. Leveraging hydrogen bonding between –CF and –CH and the interaction between C–F⋯F–C groups, the adsorbed FTCS directly leads to the growth of the P(VDF-HFP) coating layer around the treated Al NPs, yielding Al@FTCS/P(VDF-HFP) energetic composites. In comparison with the ultrasonically processed Al/P(VDF-HFP) mixture, thermal analysis reveals that Al@FTCS/P(VDF-HFP) exhibits a 57 °C lower reaction onset temperature and a 1646 J/g increase in heat release. Associated combustion tests demonstrate a 52% shorter ignition delay, 62% shorter combustion time, and a 288% faster pressurization rate. These improvements in energetic characteristics stem from the reactivity activation of FTCS towards Al NPs by the etching effect to the surface Al2O3. Moreover, enhanced interfacial contact facilitated by the FTCS-directed growth of P(VDF-HFP) around Al NPs further accelerates the whole reaction process.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 7
·3949-3957
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IF 3.108
Enjie Yu,Qilong Zhang,Nuoxin Xu,Hui Yang
In this study, self-assembly flower-like TiO2 (F-TiO2) particles with an average diameter of 400 nm are synthesized via a facile one-pot solvothermal method. P(VDF-HFP)-based composites with F-TiO2 particles of different volume ratio as fillers are prepared. Microstructure and thermal analyses confirm that F-TiO2 does not change the crystallization process of the polymer matrix, but disrupts the crystallization degree of P(VDF-HFP). Dielectric properties measured at various frequencies and temperatures indicate that the addition of the F-TiO2 fillers enhances the dielectric constant of the composites, while the dielectric loss and electric conductivity do not significantly increase. The dielectric permittivity of the polymer nanocomposites is enhanced by 200% over that of the P(VDF-HFP) matrix at a filler content of 20 vol% while maintaining a rather low dielectric loss (0.043 at 1 kHz). Especially, the F-TiO2/P(VDF-HFP) composites exhibit low electric conductivity (≤10−11 S cm−1) at low frequencies. All the improved performances suggest an easy method to fabricate nanocomposites having potential electrical applications.
研究领域:
材料科学
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电气工程
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DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Siqi Zhang,Shu Wu,Qi Wang,Mengxiang Guan,Bowen Yang,Guirong Peng,Xiaojia Zhao
P(VDF-HFP) is widely used in transistors, electret and artificial skin due to its excellent dielectric properties . In order to dramatically improve its dielectric constant, conductive fillers are used for doping, but the compatibility is not optimistic between the fillers and the PVDF . In this paper, PEDOT:PSS/P(VDF-HFP) all-organic films with interpenetrating network structure were prepared by the addition of H 2 O. The dielectric constant of the film with 0.5 wt % PEDOT:PSS reached up to 323 and the tanδ was only 0.48 (1 k Hz, 18 °C). The addition of the H 2 O made the small amount of PEDOT:PSS evenly distribute in the P(VDF-HFP), as a result, the percolation threshold decreased. Besides, molecular chains of PEDOT:PSS were overlapped to form a uniform network. This paper provided a novel preparation method for a uniform film with two kinds of matters with different compatibility.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiandie Zhang,Zhijie Fan,Heng Xu,Haozhe Li,Chongqing Deng,Xueqin Yang,Xiang Zhou,Xiaode Guo
In this work, NH 4 CuF 3 is utilized as the metal fluorine source and P(VDF-HFP) as the organic fluorine source to fabricate the Al-NH 4 CuF 3 @P(VDF-HFP) ternary energetic thin film via electrospinning technology. The continuous encapsulation of the components Al and NH 4 CuF 3 by P(VDF-HFP) endows the Al-NH 4 CuF 3 @P(VDF-HFP) composite with excellent hydrophobic properties and acid-alkali corrosion resistance, providing Al and NH 4 CuF 3 with anti-aging performance and stability in extreme environments. Additionally, the reaction performance of the Al-NH 4 CuF 3 @P(VDF-HFP) ternary reaction system is analyzed. The results indicate that the Al-NH 4 CuF 3 @P(VDF-HFP) ternary reaction system combines the performance advantages of both the Al-NH 4 CuF 3 and Al-P(VDF-HFP) binary reaction systems, namely low-temperature reaction and a high reaction rate. It is confirmed that the application of the double-F strategy can obtain an Al-NH 4 CuF 3 @P(VDF-HFP) combustion system with a high reaction rate, high ignition sensitivity, and high combustion efficiency. The combustion mechanism of composites is revealed by the analysis of gaseous and condensed products and performance analysis of reaction process. The aim of this study is to integrate the advantages of metal fluorine and organic fluorine to enhance the reaction properties of Al-based energetic composites.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
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IF 5.16
Hang Luo,Zhong Wu,Xuefan Zhou,Zhongna Yan,Kechao Zhou,Dou Zhang
Carbon nano-materials e.g. graphene are widely utilized to prepare high-к dielectrics due to their low percolation threshold. However, composites incorporated with conductive carbon nano-materials usually suffer from high dielectric loss. In this work, a strategy is proposed to suppress the dielectric loss of graphene/P(VDF-HFP) composites using two-dimensional BaTiO 3 platelets. Large interfacial region is formed in the composites due to the hybrid fillers , which results with enhanced interfacial polarization . The BaTiO 3 platelets are aligned in the perpendicular direction to the surface of the composite film after the treatment of tape casting . These aligned BaTiO 3 platelets act as isolation belts to block the electron transportation path. In these contributions, composite with a high permittivity of 66.2 and suppressed dielectric loss of 0.048 are simultaneously obtained. This work provide a feasible route to prepare high performance dielectric composites.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Defence Technology
·
2025
·
IF 5.9
Xiandie Zhang,Zhijie Fan,Heng Xu,Jinbin Zou,Chongqing Deng,Xiang Zhou,Xiaode Guo
Al/NH 4 CoF 3 - Φ ( Φ = 0.5, 1.0, 1.5, 2.0 and 3.0) binary composites and Al-NH 4 CoF 3 @P(VDF-HFP) ternary composites are fabricated via ultrasonication-assisted blending and electrostatic spraying. The effect of equivalence ratio ( Φ ) on the reaction properties is systematically investigated in the binary Al/NH 4 CoF 3 system. For ternary systems, electrostatic spraying allows both components to be efficiently encapsulated by P(VDF-HFP) and to achieve structural stabilization and enhanced reactivity through synergistic interfacial interactions. Morphological analysis using SEM/TEM revealed that P(VDF-HFP) formed a protective layer on Al and NH 4 CoF 3 particles, improving dispersion, hydrophobicity (water contact angle increased by 80.5% compared to physically mixed composites) and corrosion resistance. Thermal decomposition of NH 4 CoF 3 occurred at 265 °C, releasing NH 3 and HF, which triggered exothermic reactions with Al. The ternary composites exhibited a narrowed main reaction temperature range and concentrated heat release, attributed to improved interfacial contact and polymer decomposition. Combustion tests demonstrated that Al-NH 4 CoF 3 @P(VDF-HFP) achieved self-sustaining combustion. In addition, a simple validation was done by replacing the Al component in the aluminium-containing propellant, demonstrating its potential application in the propellant field. This work establishes a novel strategy for designing stable, high-energy composites with potential applications in advanced propulsion systems.
研究领域:
材料科学
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化学工程
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能源技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 24
·22028-22038
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IF 2.22
Peng Qirui,Yang Lu,Zhao Qiuying,Ma Yizhou,Ji Hongli,Qiu Jinhao
The development of piezoelectric polymers with superior electromechanical performance is a demand in the areas of flexible sensors, actuators and tissue engineering, among others. In this work, we reported a novel sandwich-structured piezoelectric composites comprising of poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] and Prussian blue analogs Co 3 [Co(CN) 6 ] 2 with excellent electromechanical activities. The large specific surface area, unique three-dimensional porous nanostructure and redox behavior of Co 3 [Co(CN) 6 ] 2 appeared to significantly promote the interfacial coupling effect within P(VDF-HFP), resulting in enhanced electromechanical response. Moreover, the sandwich structure topological design would enlarge the interfacial coupling effect, strengthen the breakdown strength and consequently raise the electromechanical performance. For instance, a maximum piezoelectric coefficient d 33 of ~ 41 pC/N can be achieved in the sandwiched composites at a loading of 0.8 wt%, which is 1.78 times that of pure P(VDF-HFP). Furthermore, the sandwiched composites possess superior electromechanical coupling factor k 33 up to 0.215, while that of pure P(VDF-HFP) is only 0.134.
研究领域:
材料科学
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柔性电子
·
传感器技术
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DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 11
·5750-5757
·
IF 11.301
Liang Sun,Zhicheng Shi,Huanlei Wang,Kun Zhang,Davoud Dastan,Kai Sun,Runhua Fan
Polymer dielectric composites are of great interest as film capacitors that are widely used in pulsed power systems. For a long time, huge efforts have been devoted to achieving energy densities as high as possible to satisfy the miniaturization and high integration of electronic devices. However, the discharge efficiency which is particularly crucial to practical applications has gained little attention. With the target of achieving concurrently improved energy density and efficiency, a class of rationally designed bilayer composites consisting of a pure polyetherimide layer and a BaTiO3/P(VDF-HFP) composite layer were prepared. Interestingly, the bilayer composites exhibit ultrahigh discharge efficiencies η (>95%) under external electric fields up to 400 kV mm−1 which are much higher than most of the so far reported results (η < 80%). Meanwhile, a low loss (tan δ < 0.05 @ 10 kHz) comparable to that of the pure polyetherimide is obtained. In addition, the bilayer composites show impressive improvements in breakdown strengths Eb, i.e., 285%, 363%, 366% and 567% for composites with 5 vol%, 10 vol%, 20 vol% and 40 vol% BaTiO3, compared to their single layer counterparts, resulting in obviously improved energy densities Ud. In particular, the bilayer composite with 10 vol% BaTiO3 displays the most prominent comprehensive energy storage performance, i.e., η ∼ 96.8% @ 450 kV mm−1, Ud ∼ 6 J cm−3 @ 450 kV mm−1, tan δ ∼ 0.025 @ 10 kHz, and Eb ∼ 483.18 kV mm−1. The ultrahigh discharge efficiencies and high energy densities, along with low loss and breakdown strengths, make these bilayer composites ideal candidates for high-performance dielectric energy-storage capacitors.
研究领域:
材料科学
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电子工程
✓ 已验证
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 32
·e54261
·
IF 3
Wei Wang,Bingnan Cheng,Wuwei Feng,Bin He,Shuo Liu
With the energy shortage and the increasing awareness of environmental protection, piezoelectric nanogenerator (PENG) has been widely studied in recent years. Polyvinylidene fluoride hexafluoropropylene (P(VDF-HFP)) is an ideal matrix material because of its piezoelectricity, flexibility, and toughness. Herein, a composite film of carbon nanotubes (CNTs), Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT), and P(VDF-HFP) (CNTs/BCZT/P(VDF-HFP)) were prepared via the tape casting method. Adding BCZT increased the polar β-phase in P(VDF-HFP), reaching a maximum when 40 wt% BCZT was incorporated. Adding CNTs to the matrix provides a conductive path inside the composite. The CNTs/BCZT/P(VDF-HFP) composite film demonstrated optimal electrical properties when 0.3 wt% CNTs is doped, with the open circuit voltage increased from 22 to 30 V and the short circuit current increased from 3 to 5.9 μA compared with the undoped sample. The output performance of the PENG was further improved with a three-layer folded structure, achieving an open circuit voltage of 40 V and a maximum power density of 31.5 mW m −2 , which easily lit six light-emitting diodes.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROCERAMICS
·
2017
·Vol. 40
·期 1
·65-71
·
IF 1.238
Huang Qiao,Luo Hang,Chen Chao,Zhou Kechao,Zhang Dou
Dielectric composites are of great demand in the micro-electronics industry. To enhance the energy storage density of the composites, TiO 2 nanowire clusters was synthesized by a hydrothermal method and incorporated into the P(VDF-HFP) polymer matrix in this work. The microstructure, dielectric properties of the prepared film were discussed and the effects of TiO 2 loading on the energy density were investigated. The results shows that the TiO 2 clusters were tightly blended to the P(VDF-HFP) matrix owing to the dopamine-modified interface. The dielectric constant increased with the loading of TiO 2 , the maximum dielectric constant reached 12.04 with 7.5 vol% TiO 2 loading at 1 kHz, as compared to 5.01 for the neat P(VDF-HFP). The enhanced dielectric constant was attributed to the interface polarization originated from the large interface area between the TiO 2 nanowire and polymer matrix. The discharged energy density of the composite significantly increased to 1.35 J/cm 3 with 7.5 vol% TiO 2 nanowire clusters, which was two times higher than that of the neat P(VDF-HFP) at the same condition. The findings of this work can shed a light on improving the energy density of energy storage device via morphology modification.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）