JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 28
·e55626
·
IF 2.7
Xiao Li,ChongXiao Yuan,Guoqi Gao,Hengqing Zhou,Nannan Zhang,Xinyue Yang,Xiaofang Liu,Huajun Sun
The demand for self-powered sensing technology and energy harvesting system necessitates high-performance and flexible piezoelectric materials. This paper presents a novel approach utilizing coaxial electrospinning to fabricate all-organic PVDF/PMMA piezoelectric fiber films with a shell–core structure. The resulting fiber films, cut into 2 × 2 cm 2 square pieces and hot-pressed every three pieces, demonstrate enhanced piezoelectric properties while retaining high flexibility. The interaction between the CO bonds in the PMMA polymer and the CH 2 in PVDF promotes the arrangement of F atoms in PVDF, enhancing the content of the piezoelectric active phase. Additionally, the coaxial electrospinning process fosters vertically oriented hydrogen bonds between PVDF and PMMA, augmenting cross-linking and improving mechanical properties. Notably, when the PVDF to PMMA layer volume ratio is 5:1, the piezoelectric coefficient (| d 33 |) of the composite fiber film exhibits a significant 60% increase from 10 pC N −1 in neat PVDF to 16 pC N −1 . This research holds substantial promise for applications in self-powered sensing and energy harvesting piezoelectric materials.
研究领域:
材料科学
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能源技术
·
传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·11274-11288
·
IF 4.682
Yang Bin,Yang Yingdong,Xu Xiang,Ke Yuchao,Pan Yang,Su Lifen,Wang Yingying,Wang Shuqing,Qian Jiasheng,Xia Ru,Fu Enfa
Lithium-ion batteries (LIBs) have attracted more and more attention in recent years because of their renewable, clean energy and high-cost performance. Polyvinylidene fluoride (PVDF) and polymethyl methacrylate (PMMA) were expected to be used in the preparation of LIB separator due to their excellent comprehensive properties. In this work, a series of PVDF/PMMA LIB separators were prepared by thermally-induced phase separation (TIPS), which is a simple method of fabricating microporous films. In order to improve the comprehensive performance, SiO 2 was adopted to modify the composite films with various filling proportions by solution method. Results of DSC and XRD tests showed that SiO 2 nanoparticles could significantly reduce the crystallinity of the films, but hardly changed the morphology of PVDF. With an increase in SiO 2 content, both porosity and electrolyte uptake rate for the composite films increased, but an excessive loading of SiO 2 tended to agglomerate inside the films. The porosity and electrolyte uptake rate for composite film containing 3% SiO 2 were found to be the highest. As SiO 2 loading increased, both first charge–discharge capacity and efficiency of the composite films were enhanced with the discharge cycle stability enhanced simultaneously. When 3% SiO 2 was incorporated, the PVDF/PMMA/SiO 2 composite film displayed the best comprehensive performance of the battery among all film samples examined. This study presents a facile way of manufacturing LIB separators with relatively ideal overall battery performance.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Liu Yongbin,Liu Zhengwei,Gao Jinghui,Wu Ming,Lou Xiaojie,Hu Yanhua,Li Yong,Zhong Lisheng
Dielectrics with improved energy density have long-standing demand for miniature and lightweight energy storage capacitors for electrical and electronic systems. Recently, polyvinylidene fluoride (PVDF)-based ferroelectric polymers have shown attractive energy storage performance, such as high dielectric permittivity and high breakdown strength, and are regarded as one of the most promising candidates. However, the non-negligible energy loss and inferior temperature stability of PVDF-based polymers deteriorated the energy storage performance or even the thermal runaway, which could be ascribed to vulnerable amorphous regions at elevated temperatures. Herein, a new strategy was proposed to achieve high energy density and high temperature stability simultaneously of PVDF/PMMA blends by in situ polymerization. The rigidity of the amorphous region was ideally strengthened by in situ polymerization of methyl methacrylate (MMA) monomers in a PVDF matrix to obtain PVDF/PMMA blends. The atomic force microscopic study of the microstructure of etched films showed the ultra-homogenous distribution of PMMA with high glass transition temperature in the PVDF matrix. Consequently, the temperature variation was remarkably decreased, while the high polarization response was maintained. Accordingly, the high energy density of ∼8 J/cm3 with ∼80% efficiency was achieved between 30 and 90 °C in PVDF/PMMA films with 39–62% PMMA content, outperforming most of the dielectric polymers. Our work could provide a general solution to substantially optimize the temperature stability of dielectric polymers for energy storage applications and other associated functions.
研究领域:
材料科学
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聚合物科学
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电气工程
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能量存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
KEY ENGINEERING MATERIALS
·
2015
·
IF 0
Xiao Lin Wu,Jie Lin,Jian Yan Wang,Hang Guo
In this paper composite nanofiber membranes were prepared by electrospinning technology from poly (vinylidene fluoride) (PVDF)-poly (methyl methacrylate) (PMMA)-SiO2 blend solutions with different PMMA and SiO2 contents. It was found that the diameter of electrospun nanofibers was greatly increased with the added PMMA content but decreased with the added SiO2 content, and when both PMMA and SiO2 were added the diameter of electrospun nanofibers was decreased. With a proper ratio of the PMMA and SiO2 added, the electrospum nanofiber membrane could have a suitable diameter with high porosity. The XRD results revealed that electrospun nanofiber membranes contained mainly β-phase crystal structure of PVDF, and its crystalline is reduced with the added PMMA and SiO2 contents due to the inhibited crystallization of the polymer by the inorganic particles and PMMA during the solidification process. These nanofiber membranes exhibited a high electrolyte uptake, around 300%. Moreover, the incorporation of PMMA and SiO2 into the nanofiber membrane improved the ionic conductivity from 1.7×10−3S/cm to 2.0×10−3S/cm at room temperature. Compared with commercial film PE, their cell cycle and charge and discharge performance were also greatly improved.
研究领域:
材料科学
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电化学
·
储能技术
·
纳米技术
✓ 已验证
DOI
SYNTHETIC METALS
·
2018
·
IF 2.526
Shuo Yang,Xuan Li,Huijun Li,Pei Yao
A polypyrrole/montmorillonite-polyvinylidenedifluoride/polymethyl methacrylate (PPy/MMT-PVDF/PMMA) composite film was prepared by a solvent casting technique. The surface morphology and cross-sectional structure of the 12 wt.% PPy/MMT-PVDF/PMMA composite film exhibited porosity with high specific surface area and good adsorption capacity. The 12 wt.% PPy/MMT-PVDF/PMMA composite film shows good electrolyte uptake (241%) and electrochemical stability. The ionic conductivity of the 12 wt.% PPy/MMT-PVDF/PMMA composite film with LiPF 6 organic electrolyte reaches 2.45 × 10 −3 S cm −1 at 20 °C. The Li/LiNi 1/3 Co 1/3 Mn 1/3 O 2 cell assembled with the 12 wt.% PPy/MMT-PVDF/PMMA composite film and LiPF 6 organic electrolyte exhibits good capacity retention and cycling performance at 1 C and 60 °C. At the same time, the nucleophilic substitution reacts with the PPy/MMT-PVDF/PMMA composite film and HF from hydrolysis by trace moisture of LiPF 6 in the electrolyte solution, which can inhibit the disproportionation of Mn 3+ in the LiNi 1/3 Co 1/3 Mn 1/3 O 2 electrode material and decrease the internal resistance of the cell at high temperature. In conclusion, the PPy/MMT-PVDF/PMMA composite film can be employed in Li-ion batteries.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Lu Jing,Weili Li,Chang Gao,Menglu Li,Weidong Fei
Large depletion of fossil fuels promotes the sustainable development of renewable energy. Polymer-based dielectric nanocomposites are widely utilized owing to their ultrafast charging–discharging rate and high power density in pulse power systems, smart grids, and other electrical devices. In this paper, completely new high-entropy oxide (Eu0.2Bi0.2Y0.2La0.2Cr0.2)2O3 (in short, E) nanofibers are fabricated, and the multilayered nanocomposites are prepared with electrospinning and layer-by-layer hot-pressing processes. A high energy density of 20.11 J cm–3 and an efficiency of 64% are achieved at 598.9 kV mm–1 in the trilayered nanocomposites. First, the enhanced entropy of the lattices leads to local polymorphic distortion, which, to a certain extent, limits the movements of long polymer chains, reduces the dielectric loss, and improves the breakdown strength of the nanocomposites. Moreover, for multilayered nanocomposites, the Schottky barrier forms with the direct contact between the electrodes and ferroelectric polymer. The difference in permittivity of the materials in contact with the electrodes leads to the difference in the barrier height around the interfaces, which results in a larger local electric field and a higher breakdown strength. Besides, the multilayered nanocomposites improve the rough interfaces between inorganics and organics and reduce the probability of dielectric breakdown. This work provides a new filling strategy and structural-layer design for the application of flexible dielectric materials.
研究领域:
材料科学
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能源存储
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2026
·
IF 5.7
Xiaofan Qin,Tingting Zhang,Fufeng Yan,Jing Chen,Haiyang Dai,Yang Yang,Guilin Song,Renzhong Xue,Tao Li
Precise free volume regulation suppresses charge migration, doubling breakdown strength. • PVDF/PMMA blend films achieve a significant leap in energy storage density. • Free volume studied via positron annihilation lifetime (PAL) and simulation. Five series of PVDF/PMMA blend films were fabricated, and their energy storage performance was investigated via experimental and theoretical analyses of free volume characteristics. PMMA incorporation significantly enhances thermal stability of blend film. For instance, with 50 wt % PMMA, the glass transition temperature ( T g ) rises to 117.2 °C, much higher than that of pure PVDF (−45.2 °C). Increasing PMMA content decreases free volume size but increases its relative fraction, thereby enhancing breakdown strength and reducing material density. Although a moderate reduction in dielectric constant is observed, the marked improvement in breakdown strength leads to an overall increase in energy storage density. Specifically, at 40 wt % PMMA, the blend film achieves a maximum energy storage density of 8.13 J/cm 3 ( ƞ = 67%), substantially exceeding the 3.01 J/cm 3 ( ƞ = 67%) of pure PVDF, while exhibiting a high T g of 105.1 °C. These results highlight a synergistic effect derived from the complementary properties of the two polymers, offering an effective strategy for developing high-performance polymer-based energy storage films that combine the advantages of dipolar and linear dielectric materials.
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DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Weiji Li,Xinrui Yan,Lu Ye,Changning Ran,Yue Zhang,Ruiqi He,Bixuan Zhu,Yu He,Jiacheng Guo,Hongwei Li,Jianjun Zhang,Sude Ma
In this paper, the carboxylic acid modifier 2,3,4,5-tetrafluorobenzoic acid (F4C) was used to modify the BaTiO 3 (BT) nanoparticles, which acted as a coupling agent. The modified BT(F4CBT) nanoparticles, polyvinylidene fluoride (PVDF), and polymethylmethacrylate (PMMA) were used to make the modified nanocomposite films: PVDF/PMMA-F4C-BaTiO 3 nanocomposite films. The unmodified BT nanoparticles were used to make the unmodified nanocomposite films: PVDF/PMMA-BaTiO 3 nanocomposite films. The modification effect of the F4C resulted in an increase in the amount of β-phase and γ-phase, a decrease in the amount of α-phase, and a decrease in the overall crystallinity of the PVDF-based nanocomposite films. The dielectric constant of the PVDF/PMMA-F4C-BaTiO 3 nanocomposite films reached a maximum value of 16.7 at a frequency of 100 Hz at 4 wt% F4C, which was 40.3% higher than that of the unmodified PVDF/PMMA-BaTiO 3 films. The F4C content of 2 wt% PVDF/PMMA-F4C-BaTiO 3 nanocomposite films showed the lowest dielectric loss of 0.055, which was 56.7% lower than the unmodified PVDF/PMMA-BaTiO 3 films. The breakdown strength of the PVDF/PMMA-F4C-BaTiO 3 nanocomposite films increased and then decreased with the increase of the F4C content, and the highest breakdown strength was 2800 kV/cm at 4 wt% F4C, which was 55.6% higher than the unmodified PVDF/PMMA-BaTiO 3 films. The charging density of the PVDF/PMMA-F4C-BaTiO 3 nanocomposite films reached a maximum value of 20.65 J/cm 3 at 4 wt% F4C content, which was 394% higher than the unmodified PVDF/PMMA-BaTiO 3 films. Highlights Modification of ceramic nanoparticles with carboxylic acid coupling agent. The dielectric properties of the modified nanocomposite film were significantly improved. Maximum polarization and charge/discharge density were greatly improved by coupling agent modification.
研究领域:
材料科学
·
高分子化学
·
电气工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 21
·7211-7220
·
IF 7.059
Qinzhao Sun,Jiping Wang,Lixue Zhang,Pu Mao,Shujuan Liu,Liqiang He,Fang Kang,Rong Xue
The choice of dielectric fillers and structure design play an important role in improving the energy storage properties of polymer-based nanocomposites. In this work, a class of sandwich-structured poly(vinylidene fluoride) (PVDF)-based nanocomposites with an insulating layer containing 1D NaNbO3@SiO2 nanowires was prepared using simple casting and hot-pressing methods. 1D NaNbO3 nanowires coated with a SiO2 insulating layer were introduced into the polymer matrix to form a central layer, which has high insulation and low dielectric permittivity. Consequently, the sandwich-structured nanocomposites with 9 vol% 0D BaTiO3 nanoparticles and 1 vol% 1D NaNbO3@SiO2 nanowires exhibit a high discharge energy density of ∼20 J cm−3 at 450 MV m−1 as well as a high discharge efficiency of 75%, indicating a combination of high energy density and high efficiency compared with the systems of all-polymer composites or polymer-based nanocomposites. The dielectric analyses and simulation results indicate that the improved energy storage density and discharge efficiency are attributed to the effect of insulating layers containing 1D NaNbO3@SiO2 nanowires. The findings of this work demonstrate that introducing insulating layers containing 1D nanofillers with high insulation and low permittivity can have a positive effect in improving energy storage performance of dielectric polymer-based nanocomposites.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 3
·621
·
IF 4.967
Han Wu,Jia Shi,Xin Ning,Yun-Ze Long,Jie Zheng
A simple and novel strategy of superhydrophilic-superhydrophobic Janus membrane was provided here to deal with the increasingly serious oil-water separation problem, which has a very bad impact on environmental pollution and resource recycling. The Janus membrane of cPVA-PVDF/PMMA/GO with opposite hydrophilic and hydrophobic properties was prepared by layer-by-layer electrospinning. The structure of the Janus membrane is as follows: firstly, the mixed solution of polyvinylidene fluoride (PVDF), polymethylmethacrylate (PMMA) and graphene oxide (GO) was electrospun to form a hydrophobic layer, then polyvinyl alcohol (PVA) nanofiber was coated onto the hydrophobic membrane by layer-by-layer electrospinning to form a composite membrane, and finally, the composite membrane was crosslinked to obtain a Janus membrane. The addition of GO can significantly improve the hydrophobicity, mechanical strength and stability of the Janus membrane. In addition, the prepared Janus membrane still maintained good oil-water separation performance and its separation efficiency almost did not decrease after many oil-water separation experiments. The flux in the process of oil-water separation can reach 1909.9 L m−2h−1, and the separation efficiency can reach 99.9%. This not only proves the separation effect of the nanocomposite membrane, but also shows its high stability and recyclability. The asymmetric Janus membrane shows good oil-water selectivity, which gives Janus membrane broad application prospects in many fields.Keywords:oil-water separation;Janus membrane;electrospun nanofiber;superhydrophobic
研究领域:
材料科学
·
环境科学
✓ 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）