Materials
·
2018
·Vol. 11
·期 11
·2279
·
IF 2.467
Yefeng Feng,Cheng Peng,Qihuang Deng,Yandong Li,Jianbing Hu,Qin Wu
High discharged energy density and charge–discharge efficiency, in combination with high electric breakdown strength, maximum electric displacement and low residual displacement, are very difficult to simultaneously achieve in single-component polymer dielectrics. Plenty of researches have reported polymer based composite dielectrics filled with inorganic fillers, through complex surface modification of inorganic fillers to improve interface compatibility. In this work, a novel strategy of introducing environmentally-friendly biological polyester into fluoropolymer matrix has been presented to prepare all-organic polymer composites with desirable high energy storage properties by solution cast process (followed by annealing or stretching post-treatment), in order to simplify the preparation steps and lower the cost. Fluoropolymer with substantial ferroelectric domains (contributing to high dielectric response) as matrix and poly (3-hydroxybutyrate-co-3-hydroxyvalerate) with excellent linear polarization property (resulting in high breakdown strength) as filler were employed. By high-temperature annealing, the size of ferroelectric domains could be improved and interfacial air defects could be removed, leading to elevated high energy storage density and efficiency in composite. By mono-directional stretching, the ferroelectric domains and polyester could be regularly oriented along stretching direction, resulting in desired high energy storage performances as well. Besides, linear dielectric components could contribute to high efficiency from their strong rigidity restrain effect on ferroelectric component. This work might open up the way for a facile fabrication of promising all-organic composite dielectric films with high energy storage properties.Keywords:annealing;stretching;energy storage;all-organic;composite
研究领域:
材料科学
·
能源技术
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产品关联
DOI
PubMed
高影响因子
IET Nanodielectrics
·
2020
·Vol. 3
·期 4
·147-155
·
IF 0
Zhenkang Dan,Weibin Ren,Mengfan Guo,Zhonghui Shen,Tao Zhang,Jianyong Jiang,Cewen Nan,Yang Shen
Polymer-based nanocomposites with excellent flexibility and intrinsic high breakdown strength are promising candidates for high energy density capacitors compared to ceramics counterparts. However, their energy density is relatively low due to the trade-off between permittivity and breakdown strength. In this work, the authors proposed a ferroconcrete-like structure for all-organic nanocomposites via combinatorial electrospinning and hot-pressing method. In this structure, polymethyl methacrylate (PMMA) serves as matrix while poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) serves as reinforcement phase. This novel structure is highly effective in breaking the paradox of improved discharged energy density with decreased efficiency, as evidenced by the concurrently improved discharged energy density (∼12.15 J/cm 3 compared to 8.82 J/cm 3 of the matrix) and efficiency (∼81.7% compared to 76.8% of the matrix). Compared to conventional blending composite films, samples with ferroconcrete-like structure exhibit higher permittivity, breakdown strength, discharged energy density and efficiency. The superior energy storage performance is attributed to large aspect ratio P(VDF-HFP) fibres distributed perpendicularly to the external field, which brings about the extra enhancement of permittivity. Besides, mechanical properties are improved and restriction on carrier motion is facilitated, leading to enhanced breakdown strength and suppressed conduction. This work provides a new way to design dielectric composite for high energy density and efficiency applications.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 44
·期 2
·2200568
·
IF 5.006
Aftab Ahmad,Guanghui Liu,Shimo Cao,Xuepeng Liu,Jinpeng Luo,Li Han,Hui Tong,Ju Xu
The development of novel polymer dielectrics with enhanced dielectric performance is a great challenge for application of film capacitors in modern electronics and electrical systems. Herein, an innovative approach of chemical vapor deposition polymerization technology is proposed to prepare the all-organic sandwich structured parylene/polyimide/parylene (Py/PI/Py) composite films by employing poly(chloro-para-xylylene) (parylene C) as the outer layers and polyimide (PI) as the inner layer. The Py/PI/Py composites exhibit superior thermal resistance and outstanding mechanical properties. Moreover, thanks to the interfacial effect which contributes to reinforcing the dielectric response and the thickness effect which facilitates improving the breakdown strength, the dielectric performance of Py/PI/Py composites has been enhanced significantly. Accordingly, dielectric constant of 4.52–5.09, dissipation factor of 0.21–1.01%, and breakdown strength of 307–460 MV m −1 are achieved. Besides, notable energy storage performance is also obtained in Py/PI/Py composite dielectrics. Consequently, this novel application of chemical vapor deposition polymerization method in preparing all-organic multilayered polymer composite films with sandwich structure shows promising potential in film capacitor applications in harsh conditions.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
·
IF 6.76
Binbin Zhang,Mengying Qiao,Weichen Xu,Baorong Hou
Water-repellent and interfacial non-wetting superhydrophobicity has great potential to address corrosion/icing-induced material-deterioration problems. Herein, an all-organic superhydrophobic coating was constructed using facile and substrate-independent spray-coating method based on PTFE and PDMS . FE-SEM, EDS, and XPS techniques were used to analyze the surface topographies and chemical compositions. The coating exhibits superior anti-fouling and self-cleaning properties against various liquid and solid contaminants due to the synergic effect of low surface energy and hierarchical structures. The EIS and potentiodynamic polarization results show improved charge transfer resistance ( R ct ), positive shifted corrosion potential ( E corr ), and decreased corrosion current density ( I corr ), implying significantly enhanced anti-corrosion performance with 99.83 % inhibition efficiency. Besides, the delay rate of ice-freezing time of the coating is 232 % at −5°C, 137 % at −10 °C and 204 % at −15 °C compared with uncoated Q235 substrate respectively. The ice adhesion strength of the coating accounts for only 6.55 % at −5°C, 7.03 % at −10 °C and 9.35 % at −15 °C than that of the bare Q235 carbon steel, demonstrating ultra-low ice adhesion force and anti-icing capabilities. The hygroscopic and deliquesce behaviors of NaCl salt particles reveal an intriguing salt-deliquescence self-coalescence phenomenon and prospective anti-corrosion mechanism for superhydrophobic materials in high-humidity marine atmospheric environments.
研究领域:
材料科学
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表面工程
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Tengfei Li,Lihua Wang,Jian Li
All-organic batteries that employ organic compounds as the cathode- and anode-active materials have emerged as a promising rechargeable battery chemistry system due to their environmental friendliness, sustainability, flexibility and wide raw materials availability. Just like current lithium-ion batteries, if operated improperly, there are also safe concerns mainly caused by thermal runaway in all-organic batteries. However, the safety protection for all-organic batteries has not been explored by far. In this work, a novel type of temperature-responsive symmetric all-organic battery with overheating self-protection function is proposed based on poly(3-octylthiophene) (P3OT) as both cathode- and anode-active materials. P3OT is anchored on carbon nanotube (CNT) surface to boost its p- and n-type redox activity. Rewarded by this, the resulting all-organic battery delivers a reversible capacity of 97.2 mAh g −1 at 50 mA g −1 between 0.01 and 2 V and exhibits an outstanding cycling stability. More importantly, when being charged under overheating conditions, the designed all-organic battery can always maintain the low state-of-charge. It can provide an early warning of battery overheating, and mitigate the release of chemical energy if the battery finally goes to fire. During the discharge process, the all-organic battery will be rapidly switched off, thus avoiding continuous battery damage. The thermal protection is proved to be derived from the thermal dedoping of PF 6 - from cathode-active P3OT. In addition, the all-organic battery is able to resume its normal function when battery temperature is dropped to room temperature.
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
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
He Chun-Ting,Yu Li-Hong,Liu Haiming,Wang Qing,Ye Zi-Ming,Zhang Jia,Wang Li-Dong,He Mei-Qian,Zhang Xue-Feng,Du Hong-Gang,Lu Zi-Wei,Yang Jian,Huang Hai-Hua,Chen Xiao-Ming
Covalently bonded metal-free electrocatalysts exhibit significant potential for sustainable energy technologies, yet their performances remain unsatisfactory compared with metal-based catalysts. Herein, we propose an all-organic electrocatalyst, MEC-2, that conforms to the infrequent oxide path mechanism in alkaline oxygen evolution reaction through post-oxidation modification. MEC-2 achieves an intrinsic overpotential of 257.7 ± 0.6 mV at 10 mA·cm −2 and possesses durability with negligible degradation over 100,000 CV cycles or 250 h of operation at 1.0 A·cm −2 , being comparable to the advanced metal-based OER electrocatalysts. The 18 O-labeled operando characterization and theoretical calculations unveil that post-oxidation modification enhances the electron affinity to OH intermediates, and adjusts the adsorption configuration and proximity distance of O intermediates, thereby promoting direct O−O radical coupling. In this work, we show a fresh perspective for understanding the role of non-metallic elements/functional groups in electrocatalysis, and to a certain extent, narrows the gap between all-organic electrocatalysts and metal-based electrocatalysts.
研究领域:
能源材料科学
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电化学
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理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xianhui Dong,Yan Wang,Yutong Cao,Na Li,Jiabin Fu,Yan Wang,Junrong Yu,Zuming Hu
Advanced electronic devices and energy systems urgently require high-temperature polymer dielectrics that can offer both high discharge energy density and energy storage efficiency. However, the capacitive properties of most polymers sharply deteriorate at elevated temperatures, due to the significant rise in leakage current density and energy loss. Herein, a new design approach is adopted to fabricate high-temperature polyetherimide (PEI) dielectrics with chemical and physical cooperative crosslinking networks, the dual-crosslinked PEI dielectrics are prepared through amine crosslinking agent and the electrostatic interaction of oppositely charged phenyl groups between triptycene (TE) and PEI chain segments. Benefiting from the increased crosslinking sites, the dual-crosslinked PEI films achieve the simultaneously enhancement in T g , modulus and bandgap compared to un-crosslinked and single-crosslinked polymers. Meanwhile, the PEI with dual-crosslinked network displays higher chain packing density, effectively reducing the mean motion pathways of charge carriers and the conduction loss inside polymer dielectric. Consequently, the dual-crosslinked PEI containing 0.25 wt% TE delivers an outstanding discharge energy density of 2.69 J/cm 3 and retains excellent cyclability after 100,000 charge–discharge cycles at 200 ℃. Additionally, finite element analysis and molecular dynamics simulation further confirm that less Joule heat and tighter chain structure are formed in the dual-crosslinked polymer dielectric. This research offers a novel methodology to prepare high-performance polymer dielectrics for high-temperature applications.
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
Advanced Electronic Materials
·
2024
·
IF 5.3
Shanlei Guo,Jing Sun,Xue Wang,Yanhong Tong,Qingxin Tang,Yichun Liu
Organic thin-film transistors (OTFTs), the key component of the future wearable electronics, have the outstanding advantages including cost-effective, low-temperature, and large-area production. However, all-organic TFTs with an all-solution process and high-precision electrode pattern remain an enormous challenge due to dissolution and incompatible fabricated processes between functional layers. Here, a universal, solution-free transfer and lamination strategy is proposed, which is totally compatible with various commercial materials and fabricated technique in transistors. Excellent mechanical stability, good operation, high-precision electrode patterns, and outstanding conformability are observed in the all-organic TFTs. Moreover, as a proof-of-utility for the strategy, the all-organic complementary inverters are fabricated based on all dry-transfer processes with gain value of 11.2 and stable properties in 30 days in the air. This work provides a universal, solution-free transfer and lamination strategy to fabricate high-precision, all-solution-processed, all-organic devices fully maximizing the great advantages of organic materials for the future multilayered functional, commercialized, and industrialized flexible electronics.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaona Li,Hang Luo,Yuting Wan,Bo Peng,Yuan Liu,Sheng Chen,Dou Zhang
High temperature resistance is essential for electrostatic capacitors, for example, the operating temperature of capacitors used in inverters for hybrid electric vehicles is around 140–150 °C. However, the reliability of current commercial dielectrics, such as biaxial stretched polypropylene (BOPP), significantly degrades when the operating temperature exceeds 105 °C. In this work, an all-organic dielectric utilizing two mechanisms—high electron affinity and physical interaction—is designed to enhance the capacitive performance. Specifically, the molecular semiconductor 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), with ultra-high electron affinity (5.24 eV) and peripheral electronegativity, is incorporated with polyetherimide (PEI). Deep electron traps are successfully constructed to capture free electrons due to the incorporation of high-electron-affinity F4-TCNQ. Moreover, it is difficult for the captured electrons to escape because of the Coulomb force between electrons in the low unoccupied molecular orbital (LUMO) of F4-TCNQ and holes in the highest occupied molecular orbital (HOMO) of PEI. From another point of view, physical interaction is formed between the peripherally electronegative groups of F4-TCNQ and the positively charged phenyls of PEI, improving the packing density among polymer chains and the Young’s modulus. Consequently, the electromechanical breakdown strength is enhanced. These two mechanisms play their part simultaneously, realizing significantly suppressed conductivity loss and increased breakdown electric field. Accompanied by an improved dielectric constant, the discharged energy density of F4-TCNQ/PEI composites is significantly increased over a wide temperature range. Especially at 150 °C, the discharged energy density ( U e ) of 0.6 wt% F4-TCNQ/PEI reaches 7.84 J/cm 3 at 670 kV/mm, which is 123 % higher than that of PEI (3.52 J/cm 3 ). The U e is still as high as 5.12 J/cm 3 even when the discharged efficiency ( η ) is over 90 %. This work exhibits a promising prospect of all-organic dielectrics in capacitive application at high temperature.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Yang Liu,Guo Tian,Yue Sun,Shenglong Wang,Longchao Huang,Xuelan Li,Tianpei Xu,Long Jin,Yulin Zou,Weili Deng,Weiqing Yang
Ferroelectric polymers have drawn tremendous attention in film capacitors owing to their high permittivity and ease of processing. Nevertheless, the energy density of such materials is severely constrained due to inferior breakdown strength. To address this dilemma, a double-gradient multilayered all-organic dielectric composite film is proposed, fabricated via a simple layer-by-layer solution-casting process. The experimental results demonstrate that the composite film significantly suppresses the leakage current compared to the pristine films, resulting in remarkable enhancement of the insulation properties. The finite element simulation results further reveal that the optimized electric field distribution induced by the gradient structure and the carrier traps at the interfaces between the adjacent layers play a crucial role in impeding the propagation of the breakdown path. As a result, the developed dielectric film reaches an unexpected breakdown strength of 712 MV m −1 along with a high energy density of 19.68 J cm −3 , surpassing the bench-mark biaxially oriented polypropylene as well as the existing ferroelectric-based composites reported in the recent works. The synergy of gradient and multilayered structure presented in this work offers a novel perspective and approach for the scalable fabrication of dielectric films with eminent capacitive performance.
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
Materials Today Communications
·
2024
·
IF 3.7
Wenchao Zhang,Yong Zhang,Dong Yue,Puzhen Wang,Yunpeng Liu,Haijuan Wu,Jialong Li,Yu Feng
The high-speed train is developing towards higher speed and greater load capacity. As an important part of this, inverter-fed traction motors need higher power. As the turn-to-turn insulating material for inverter-fed traction motors, polyimide (PI) does not satisfy the requirements for breakdown strength and corona aging life with higher power. In this paper, the heterogeneous all-organic composite is designed with polyimide as matrix and acrylic elastomer (DE) as reinforcing material. When the load of DE is 0.5 wt%, the breakdown strength of the thermosetting DE/PI composites is up to 740 kV/mm, which is 60 % higher than PI (462 kV/mm) and the corona aging life is up to 70.4 h which is increased by about 340 % compared with PI (16 h). The synergy of free volume and trap makes comprehensive properties enhanced in the thermosetting DE/PI composite. This work provides a new design for turn-to-turn insulation with a high voltage level and a high operating frequency.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
PLASMA SCIENCE & TECHNOLOGY
·
2023
·Vol. 25
·期 8
·084001
·
IF 1.7
Penghao ZHANG,Liang YU,Dazhao HE,Xinyu TANG,Shuo CHEN,Shoulong DONG,Chenguo YAO
The surface charge accumulation on polymers often leads to surface flashover. Current solutions are mainly based on the introduction of inorganic fillers. The high-cost process and low compatibility remain formidable challenges. Moreover, existing researches on all-organic insulation focus on capturing electrons, contrary to alleviating charge accumulation. Here, an all-organic modification coating was prepared on polystyrene (PS) with the large-scale atmospheric-pressure plasma, which exhibits outperformed function in mitigating surface charge accumulation. The surface charge dissipation rate and surface conductivity are promoted by about 1.37 and 9.45 times, respectively. Simulation and experimental results show that this all-organic modification coating has a smaller electron affinity potential compared with PS. The decrease of electron affinity potential may result in accelerated surface charge decay of PS, which has never been involved in previous works. Moreover, this coating also has good reliability in a repeated surface flashover. This facile and large-scale approach brings up a novel idea for surface charge regulation and the manufacture of advanced dielectric polymers.
研究领域:
材料科学
·
电气工程
✓ 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）