Materials Today Energy
·
2022
·
IF 9.257
Haoran Xie,Hang Luo,Zhantao Pei,Sheng Chen,Dou Zhang
With increased requirements from the miniaturization, lightweight and integration of electronic devices, it is urgent to improve the discharge energy density ( U e ) of commercial polypropylene (PP) film capacitor. In this work, core-shell structure BaTiO 3 @TiO 2 nanoparticles were introduced into polypropylene matrix via melt mixing method. Due to the existence of the transition layer, the addition of BaTiO 3 @TiO 2 nanoparticles can increase the interfacial polarization of the composites without causing obvious local electric field concentration in comparison with bare BaTiO 3 nanoparticles. Moreover, BaTiO 3 @TiO 2 nanoparticles can act as an electron trap to inhibit the movement of carriers and hinder the growth of the electrical tree, thereby promoting the breakdown strength ( E b ) of PP-based nanocomposites. As a result, the U e of the nanocomposite with 6 wt% BaTiO 3 @TiO 2 nanoparticles was improved from 4.28 J/cm 3 of pure PP to 5.58 J/cm 3 , maintaining a high efficiency of more than 95%. This study provides an effective strategy to optimize energy storage density of PP film capacitors.
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
Materials
·
2021
·Vol. 14
·期 17
·4780
·
IF 3.623
Yushu Li,Yao Zhou,Sang Cheng,Jun Hu,Jinliang He,Qi Li
The development of high-energy-density electrostatic capacitors is critical to addressing the growing electricity need. Currently, the widely studied dielectric materials are polymer nanocomposites incorporated with high-dielectric-constant nanoparticles. However, the introduction of high-dielectric-constant nanoparticles can cause local electric field distortion and high leakage current, which limits the improvement in energy density. In this work, on the basis of conventional polymer nanocomposites containing high-dielectric-constant nanoparticles, oriented boron nitride nanosheets (BNNSs) are introduced as an extra filler phase. By changing the volume ratios of barium titanate (BT) and BNNSs, the dielectric property of polymer nanocomposites is adjusted, and thus the capacitive energy storage performance is optimized. Experimental results prove that the oriented BNNSs can suppress the propagation of charge carriers and decrease the conduction loss. Using poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) as the polymer matrix, the P(VDF-HFP)/BNNS/BT nanocomposite has a higher discharged energy density compared with the conventional nanocomposite with the freely dispersed BT nanoparticles.Keywords:discharged energy density;charge–discharge efficiency;electric breakdown;ferroelectric films;dielectric losses
研究领域:
材料科学
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电气工程
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产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Meng Pan,Rui Feng,Yu Wang,Yang Zhang,Lijie Dong
Dielectric polymers have been extensively employed in renewable energy conversion, hybrid electric vehicle, and high voltage direct current transmission systems, owing to their excellent electrical insulation, processability, and self-healing capability. However, the challenge lies in their relatively low dielectric constant ( ε r ) and limited discharge energy density ( U e ), which hinder the advancement of integrated power modules. Despite numerous efforts aimed at enhancing U e , the fabrication of scalable dielectric film with both enhanced U e and high charge–discharge efficiency ( η ) remains a major obstacle. Herein, the polypropylene-based films with BaTiO 3 @PP-g-MAH (BTO@PP-g-MAH) core–shell nanoparticles are prepared through a continuous melt extrusion process. The resulting nanocomposite film, incorporated with 5 wt% BTO@PP-g-MAH, exhibits an impressive U e of 5.15 J cm −3 and achieves a high η of 93.2 % at 433 MV m −1 , along with excellent cycle dielectric stability. Such enhancements in ε r and U e are ascribed to the improved interfacial polarization facilitated by BaTiO 3 nanoparticles and the enhanced interface binding achieved through the PP-g-MAH shell layers. Furthermore, the enhancement of electric breakdown strength ( E b ) is comprehensively investigated based on electrical breakdown mechanism and electromechanical breakdown model. This study demonstrates a novel strategy to prepare nanocomposite dielectric films that are compatible with commercial capacitor fabrication process.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
Journal of Advanced Ceramics
·
2020
·Vol. 9
·期 3
·292-302
·
IF 2.889
Wang Hongxian,Zhao Peiyao,Chen Lingling,Li Longtu,Wang Xiaohui
Multilayer ceramic capacitors (MLCCs) for energy storage applications require a large discharge energy density and high discharge/charge efficiency under high electric fields. Here, 0.87BaTiO 3 -0.13Bi(Zn 2/3 (Nb 0.85 Ta 0.15 ) 1/3 )O 3 (BTBZNT) MLCCs with double active dielectric layers were fabricated, and the effects of inner electrode and sintering method on the energy storage properties of BTBZNT MLCCs were investigated. By using the pure Pt as inner electrode instead of Ag 0.6 Pd 0.4 alloys, an alternating current (AC) breakdown strength ( BDS ) enhancement from 1047 to 1500 kV/cm was achieved. By investigating the leakage current behavior of BTBZNT MLCCs, the Pt inner electrode and two-step sintering method (TSS) were confirmed to enhance the Schottky barrier and minimize the leakage current density. With relatively high permittivity, dielectric sublinearity, and ultra-high BDS , the Pt TSS BTBZNT MLCCs exhibited a surprisingly discharge energy density ( U dis ) of 14.08 J/cm 3 . Moreover, under an operating electric field of 400 kV/cm, the MLCCs also exhibited thermal stability with U dis variation < ±8% over a wide temperature ( t ) range from -50 to 175 °C and cycling reliability with U dis reduction < 0.3% after 3000 charge-discharge cycles. These remarkable performances make Pt TSS BTBZNT MLCCs promising for energy storage applications.
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
Cell Reports Physical Science
·
2024
·
IF 7.9
Pengzu Ge,Lili Li,Mengquan Jiang,Gaofeng Wang,Fei Wen,Xiaoyi Gao
Dielectric capacitors’ ability to operate steadily under high-temperature conditions is crucial for contemporary electronic equipment. Here, we report a sandwich-structure polyetherimide (PEI)-boron nitride nanosheet (BNNS)/polyvinylidene fluoride and polymethyl methacrylate (PVDF&PMMA)-HfO 2 /PEI-BNNS composite. On the one hand, the mechanical clamping of PEI film with high-temperature resistance can enable PVDF&PMMA to maintain a high polarization value at 150°C. On the other hand, BNNS with a wide gap and HfO 2 nanofiller with high dielectric properties can effectively increase the breakdown strength and maximum polarization value, respectively. The discharge energy density ( U d ) and efficiency ( η ) of the composite reach 12.01 J/cm 3 and 91.05%, respectively, at 150°C. The composite maintains high thermal stability in a wide temperature range from room temperature to 150°C with fluctuations of U d and η , both below 1%. The results suggest that the composite has great application potential for stable charging and discharging under high-temperature environments.
研究领域:
材料科学
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能源存储
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Horizons
·
2024
·
IF 12.2
Bo Peng,Pengbo Wang,Hang Luo,Guanghu He,Haoran Xie,Yuan Liu,Sheng Chen,Xiaona Li,Yuting Wan,Ru Guo
Improving the high-temperature performance of polymer dielectrics is critical for the development of advanced electrical systems. The deterioration of the capacitive performance of polymer dielectrics at high electric fields and elevated temperatures is attributable to the exponentially increased conduction loss. Herein, a synergistic strategy of molecular trap and aggregation structure optimization is developed to suppress the conduction loss of polymer dielectrics. A molecular semiconductor – HAT-CN with high electron-affinity (EA) and special distribution of electrostatic potential is designed in this work. The theoretical calculation and experimental results show that HAT-CN can introduce electron traps and simultaneously interrupt the conjugation between aromatic rings in molecular chains via electrostatic interaction with polyetherimide (PEI). Consequently, the collective effect of electron trap and aggregation structure optimization reduces the leakage current density of PEI by nearly an order of magnitude at 200 °C and improves the mechanical properties of films. Finally, the HAT-CN/PEI all-organic composite achieves a discharge energy density of 3.8 J cm−3 with efficiencies above 90% (Uη>90%) and long-term reliability over 100 000 cycles at 200 °C, outperforming most current polymer dielectrics. This work provides a new idea for the design of high-temperature polymer dielectrics based on molecularly engineered organic semiconductors.
研究领域:
材料科学
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电气工程
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Fan Zhenhao,Dai Jian,Huang Yuyan,Xie Hang,Jiao Yitao,Yue Wenfeng,Huang Fu,Deng Yuqun,Wang Dawei,Zhang Qingfeng,Chang Yunfei
Dielectric polymer capacitors suffer from low discharged energy density and efficiency due to their low breakdown strength, small dielectric constant and large electric hysteresis. Herein, a synergistic enhancement strategy is proposed to significantly increase both breakdown strength and dielectric constant while suppressing hysteresis, through introducing 2-dimensional bismuth layer-structured Na 0.5 Bi 4.5 Ti 4 O 15 micro-sheets and designing a unique bilayer structure. Excitingly, an ultra-high discharged energy density of 25.0 J cm −3 and a large efficiency of 81.2% are achieved in Na 0.5 Bi 4.5 Ti 4 O 15 -poly(vinylidene fluoride-co-hexafluoropropylene)/Na 0.5 Bi 4.5 Ti 4 O 15 -polyetherimide bilayer composites under a dramatically enhanced breakdown strength of 8283 kV cm −1 . Finite element simulations along with experimental test results demonstrate that greatly improved breakdown strength is ascribed to uniform and horizontal alignments of Na 0.5 Bi 4.5 Ti 4 O 15 sheets (~1–2 μm) in the matrix and interface effect of adjacent layers with large dielectric differences, which effectively inhibit electrical tree evolution and conduction loss. This work provides a strong foundation for developing high-performance polymer-based energy storage devices.
研究领域:
材料科学
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能源存储技术
✓ 已验证
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 25
·15347-15355
·
IF 10.733
Zhongbin Pan,Shuang Xing,Haitao Jiang,Jinjun Liu,Shuangwu Huang,Jiwei Zhai
Electrostatic capacitors with a high dielectric constant and breakdown strength are desired for dielectrics to achieve a higher discharged energy density. Here, we propose that an artificial polymer nanocomposite combining a novel hybrid structure of one-dimensional Ag@BaTiO3@polydopamine@Ag nanofibers (1D ABPAs) as fillers and poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] as the matrix demonstrated a remarkably comprehensive performance. A large displacement (9.84 μC cm−2 at 480 MV m−1) was observed so as to obtain a high discharged energy density (∼17.25 J cm−3) of the composite films with 3 vol% 1D ABPAs, which was 2.22-times that of pristine P(VDF-HFP) (∼7.74 J cm−3). This discharged energy density is among the highest under an equivalent electric field strength reported so far. The corresponding composite films exhibited a superior charge/discharge speed of 139 ns and excellent reliability in energy storage performance by consecutive cycling. This work could provide an effective way to design and improve the performance of polymer-based nanocomposites for capacitive energy-storage 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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 10
·7663-7671
·
IF 2.22
Liu Yang,Hou Yafei,Ji Qian,Wei Shixin,Du Peng,Luo Laihui,Li Weiping
Sandwich-structured composite films have been regarded as an effective route to resolve the paradox between polarization increase and breakdown strength decrease, and achieve the excellent energy storage performances. However, there are few studies focused on optimizing the individual-layer properties and obtaining satisfactory energy storage performances in the sandwich-structured composite films. In this study, the x TBT (where x is the TO nw fractions, T and B are the TO nws and BT nps filled layers, respectively) sandwich-structured composite films with excellent energy storage performance have been realized though regulating each individual-layer properties, including the dielectric properties, polarization, leakage current and breakdown strength and so on. Notably, the maximum discharged energy density of the 2TBT composite film reaches up to 13.7 J/cm 3 at 400 MV/m, and maintains a relatively high energy efficiency of 65%. The enhanced discharged energy density of 2TBT composite film represents a great improvement of 137% higher than that of the neat PVDF (5.8 J/cm 3 at 345 MV/m) due to the simultaneously improved breakdown strength and polarization. The preliminary results might pave the way for future designing and optimizing discharged energy density and energy efficiency of sandwich-structured films.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
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
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产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 8
·4250-4260
·
IF 1.938
Xu Jingjing,Fu Chao,Chu Huiying,Qian Jing,Li Weiyan,Ran Xianghai,Nie Wei
Dielectric capacitors have attracted increasing attention for their fast charge–discharge speeds as well as high power density, and they have been widely used in advanced electronics and electric power systems. Here, dopamine-modified TiO 2 (TiO 2 @PDA) nanosheets were synthesized via hydrothermal reaction and in situ polymerization. Then the synthesized TiO 2 @PDA nanosheets were introduced into the poly(vinylidene fluoride) (PVDF) matrix via solution blending. Our results reveal that loading a small amount of TiO 2 @PDA nanosheets can effectively enhance the energy storage performance of the nanocomposites. For example, a superior discharge energy density with 10.53 J/cm 3 is obtained for the 9 wt.% TiO 2 @PDA/PVDF nanocomposite at 195 MV/m, which is 1.75 times as large as discharge energy density of pure PVDF (6.01 J/cm 3 at 170 MV/m). Such significant improvement is due to the large aspect ratio as well as dopamine modification of the TiO 2 nanosheets. The study provides a feasible way to prepare the nanocomposites with excellent energy storage performance.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Feng Wang,Hao Wang,Xiaoming Shi,Chunli Diao,Chaolong Li,Weikun Li,Xu Liu,Haiwu Zheng,Houbing Huang,Xiaoguang Li
High-temperature polymer-based dielectric capacitors are crucial for application in electronic power systems. However, the storage performance of conventional dielectrics polymer dramatically deteriorates due to the thermal breakdown under concurrent high temperatures and electric fields, and there are hardly reports on the causes of thermal breakdown from the aspects of the high-temperature conduction loss and Joule heat dissipation. Herein, a combined strategy of crosslinking and compositing for polyimide-based composites is proposed, which minimizes the thermal breakdown by significantly inhibiting the high-temperature conduction loss and enhancing the thermal conductivity. Furthermore, the rationale of the strategy was theoretically and experimentally verified from multiple perspectives. The charge-trapping effect is directly observed by Kelvin probe force microscopy probed (KPFM) with nano-level resolution and quantitatively by thermally stimulated depolarization current measurements, indicating that the crosslinking network introduces local deep traps and effectively suppresses the charge transport. The thermal conductivity of the composites inhibits the high-temperature thermal breakdown, which is confirmed by phase-field simulations. Consequently, the optimized composites possess an ultra-high discharge energy density ( U d ) of 5.45 J/cm 3 and 3.54 J/cm 3 with a charge–discharge efficiency ( η ) of 80 % at 150 and 200 °C, respectively, which outperforms the reported polyimide-based dielectric composites. This work provides a scalable direction for high-temperature polymer-based capacitors with excellent performance.
研究领域:
材料科学
·
电子工程
·
能源存储
✓ 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）