CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xinyu Wang,Rui Yang,Peng Lu,Jiabao Wang,Chunhua Lu,Kai Guo,Ning Zhu,Xin Hu
To meet the growing requirement for highly integrated electronic systems, nanocomposites comprised high dielectric constant ( ε ) ceramic nanofillers and large dielectric breakdown strength ( E b ) polymer has been widely investigated for high energy density capacitor. However, the poor interfacial compatibility arising from the great difference of surface energies and ε values usually resulted to the sacrifice of the dielectric properties and thus the capacitive performance. In this work, a series of core-shell structured barium titanate (BaTiO 3 ) nanofillers were designed and prepared to address this challenge via surface-initiated atom transfer radical polymerization (SI-ATRP) of methyl methacrylate (MMA), ethyl methacrylate (EMA) and glycidyl methacrylate (GMA). BaTiO 3 @PMMA (BT@M), BaTiO 3 @PEMA (BT@E), BaTiO 3 @PGMA (BT@G) were fabricated and incorporated into poly (vinylidene fluoride- co -hexafluoropropylene) (P(VDF-HFP), PVH), respectively. Enhanced dielectric properties, E b , and energy storage density were observed in these nanocomposites comparing with nanocomposites of BT/PVH. It should be ascribed to the polymer shell layer alleviated the great surface energy and ε value disparity between BT filler and PVH matrix, which was responsible for the enhancement of the interfacial compatibility and homogenous distribution of electric fields. Among these three types of nanocomposites, PVH/BT@G exhibited superior dielectric properties and capacitive performance. Extraordinary advances in charge carrier suppression at elevating temperature and electric field were also witnessed in PVH/BT@G. It should be attributed to the polar PGMA layer served as the deep traps, which block the charge motion in the filler-matrix interfaces. At optimal conditions, energy density of 10.61 J cm −3 and efficiency of 65.7 % at 360 MV m −1 was achieved. This work may provide insight into the rational design of the shell layer of the fillers for polymer nanocomposites dielectrics.
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DOI
高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Shuimiao Xia,Kuan Chen,Kelan Yan,Liming Shen,Meiyu Zhang,Zhicheng Shi,Runhua Fan
Polymer dielectric composites are extensively used in modern electronic devices because of their extremely high power density. However, unfavorable coupling between breakdown strength and dielectric permittivity can make achieving high energy density a challenge. In this study, reduced graphene oxide @ barium titanate (RGO@BTO) hybrid nanosheets have been fabricated and utilized as fillers in the design of RGO@BTO/P(VDF-HFP) single-layer films. An increase in permittivity to 24.8@10 kHz, i.e., equivalent to 253% of the P(VDF-HFP) (∼9.8@10 kHz) matrix, has been achieved with only 1 wt % RGO@BTO nanofillers due to the formation of microcapacitors. Furthermore, the RGO@BTO/P(VDF-HFP) film is hot-pressed with a PEI film and a P(VDF-HFP) film, forming a trilayer structure. Consequently, this trilayer film displays a high breakdown strength of 478 kV/mm, a high energy density of 8.25 J/cm3, and a satisfactory efficiency of 64.3%. Thus, this study provides an efficient route for designing polymer composites that combine high energy density with high permittivity.
研究领域:
材料科学
·
电气工程
·
纳米技术
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 8
·975-983
·
IF 3.603
Li Hui-Xian,Hou Lei,Wu Pei-Yi
The time-resolved attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy is employed to investigate the transport mechanism of gel electrolytes by monitoring the diffusion behavior of propylene carbonate-lithium bis(trifluoromethylsulfonyl)imide (PC-LiTFSI) solution through poly(vinylidene fluoride- co -hexafluoropropylene) (P(VDF-HFP)) films. Fickian behavior has been observed for both TFSI − and PC. Higher temperature leads to faster diffusion of TFSI − and PC, which could be related to the increased free volume in P(VDF-HFP) matrix and rapid molecular movements upon heating. Various molecular interactions among LiTFSI, PC and P(VDF-HFP) have been recognized. During the diffusion process, PC molecules, in the form of small clusters, can firstly diffuse through the P(VDF-HFP) film and interact with P(VDF-HFP) by dipole-dipole interaction, acting as the plasticizer. Then, Li + diffuses into P(VDF-HFP) with the help of ion-dipole interactions between Li + and C-O of PC. Meanwhile, TFSI − diffuses through the polymer matrix in solvation states. In addition, slight ion-dipole interactions between Li + and P(VDF-HFP) have been observed as well. Results in this work contribute to a better understanding of transport process in gel polymer electrolytes for lithium-ion batteries and support the development of improved gel polymer electrolytes by rationally regulating molecular interactions.
研究领域:
高分子化学
·
电化学
·
能源材料
·
锂离子电池
·
光谱分析
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 20
·1565
·
IF 3.2
Yang Bowen,Zhang Siqi,Guan Mengxiang,Liu Lei,Yan Ziyu,Liang Yongri,Peng Guirong,Zhou Zhe
Owing to the outstanding ferroelectric properties, PVDF and its copolymers have emerged as the most promising piezoelectric polymer materials to date. To enhance the dielectric constant of P(VDF-HFP) while reducing its dielectric loss, BT@C@SiO 2 with a double-layer shell structure was synthesized and blended with P(VDF-HFP) to fabricate a piezoelectric film. Under mild conditions, PDA was synthesized as the precursor of the conductive carbon inner shell, which was carried out in a weakly alkaline Tris buffer system at room temperature, only involving stirring, centrifugation, water washing, and low-temperature drying, without any drastic reaction procedures. The results demonstrated that the incorporation of BT increased the dielectric constant of the film, whereas the introduction of the C layer formed micro-capacitors within the matrix, further enhancing the dielectric constant. Simultaneously, the C layer with high defect density captured freely mobile carriers in the film, thereby reducing AC conductivity and dielectric loss, which improved the energy harvesting efficiency of the piezoelectric film. The dielectric constant of the BT@C@SiO 2 /P(VDF-HFP) film could reach up to 15.8 (100 Hz), while the dielectric loss and conductivity were as low as 0.042 and 3.77 × 10 –9 S/m (100 Hz), respectively. The BT@C@SiO 2 acted as a nucleating agent in the P(VDF-HFP) matrix, and consequently induced the increase of the crystallization temperature and the formation of β phase in P(VDF-HFP). When the BT@C@SiO 2 content reached 5%, under a pressure of 40 N and a loaded resistance of 10 6 Ω, the composite film achieved its highest piezoelectric output with the output voltage of 1.1 V. Under a pressure of 40 N and a loaded resistance of 10 11 Ω, the piezoelectric output power reached its maximum value of 8.76 μW. A 5% BT@C@SiO 2 /P(VDF-HFP) film was fabricated into a piezoelectric sensor for practical applications. The output voltages of the film during finger bending, finger tapping and foot stepping were 0.40 V, 0.75 V, and 2.65 V, respectively. These results indicated that BT@C@SiO 2 /P(VDF-HFP) piezoelectric film exhibited potential application in motion monitoring.
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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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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
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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
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
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DOI
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
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 6
·1811-1822
·
IF 2.573
Jian Chen,Chuang Zhou,Wei Cai,Fuxiang Huang,Chunyan Zhang,Liangliang Cao,Fancheng Meng
Ceramic/polymer nanocomposites have been extensively explored for dielectric capacitor application due to their high energy storage performance and ease of processing, flexibility, and low cost. However, improving compatibility between inorganic and organic materials is of great significance and has been a long-standing challenge. In this work, the polymer surfactant Pluronic™ F127 was employed to perform surface modification of BaTiO 3 through a facile solution process. The compatibility between BaTiO 3 nanoparticles and P (VDF-HFP) can be remarkably strengthened by the affinity between F127 polymer chains and the organic matrix. Structural defects such as pores, cracks, and agglomeration of inorganic particles were obviously reduced, and interfacial polarization has been significantly enhanced. The discharged energy density U d and charge–discharge efficiency η reach up to 5.0 J/cm 3 and 58.1% under the breakdown strength of 3740 kV/cm for the nanocomposite containing 1 vol% BT@F127. These dielectric properties are clearly better than the nanocomposite using unmodified BT, as well as similar hybrids reported previously.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2021
·Vol. 28
·期 2
·767-777
·
IF 2.817
Zang Guojing,He Min,Liao Youhao,Li Minsui,Hong Mingyao,Li Weishan
To improve the comprehensive performance of fibrous membrane based on poly(methyl vinyl ether-alt-maleic anhydride) P(MVE-MA)- and poly(vinylidene fluoride-co-hexafluoropropylene) P(VdF-HFP)-blended copolymers, a small amount of nano-Al 2 O 3 was doped by electrospinning technique to apply for high-energy-density cathode material of nickel-rich LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) based Li-ion battery. The results indicated that the electrospinning membrane and corresponding gel polymer electrolyte (GPE) only doped with 3.0 wt.% nano-Al 2 O 3 presented the proper structure and delivered the best electrochemical characterization. Due to the uniform distribution of nanoparticles on the fibers with higher density, the specific surface area and porosity of the fiber membrane were increased, leading to the improved fracture stress of 172.0 MPa for the membrane and ionic conductivity of 2.1 × 10 −3 S cm −1 for the GPE at room temperature. Contributed from the proper pore structure and the enhanced interfacial stability, the capacity retention of 89.4% was achieved for the Li/GPE/NCA coin cell after 200 cycles in the voltage range of 3.0 V and 4.3 V under room temperature using the GPE doped with 3 wt.% Al 2 O 3 , compared with that of 63.6% for the GPE without nanoparticles. Similarly, the discharge capacity of the coin cell under 7 C rate (123.2 mAh g −1 ) maintained 65% of that at 0.3 C (189.4 mAh g −1 ), showing good rate performance of the developed GPE. Therefore, the significant improvement in electrochemical stability of the GPE achieved by doping a small number of nanoparticles provided a simple and feasible solution for the development of high-energy-density Li-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 14
·5304
·
IF 4.6
Caiyuan Liu,Xin Fang,Hui Peng,Yi Li,Yonggang Yang
The aim of this work is to effectively combine the advantages of polymer and ceramic nanoparticles and improve the comprehensive performance of lithium-ion batteries (LIBs) diaphragm. A flexible film composed of electro-spun P(VDF-HFP) nanofibers covered by a layer of mesoporous silica (P(VDF-HFP)@SiO2) was synthesized via a sol–gel transcription method, then used as a scaffold to absorb organic electrolyte to make gel a electrolyte membrane (P(VDF-HFP)@SiO2-GE) for LIBs. The P(VDF-HFP)@SiO2-GE presents high electrolyte uptake (~1000 wt%), thermal stability (up to ~350 °C), ionic conductivity (~2.6 mS cm−1at room temperature), and excellent compatibility with an active Li metal anode. Meanwhile, F-doping carbon/silica composite nanofibers (F-C@SiO2) were also produced by carbonizing the P(VDF-HFP)@SiO2film under Ar and used to make an electrode. The assembled F-C@SiO2|P(VDF-HFP)@SiO2-GE|Li half-cell showed long-cycle stability and a higher discharge specific capacity (340 mAh g−1) than F-C@SiO2|Celgard 2325|Li half-cell (175 mAh g−1) at a current density of 0.2 A g−1after 300 cycles, indicating a new way for designing and fabricating safer high-performance LIBs.Keywords:composite materials;electro-spun nanofiber;gel electrolyte;carbonaceous anode;lithium-ion batteries
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）