Article
Engineering, Electrical & Electronic
Shakeel Akram, M. Shoaib Bhutta, Kai Zhou, Pengfei Meng, Jerome Castellon, Peng Wang, Ghulam Rasool, M. Aamir, M. Tariq Nazir
Summary: This paper evaluates the dependence of XLPE electrical breakdown on carrier mobility controlled by electric field and temperature through simulations and experiments. The molecular chain displacement model incorporating the thermoelectric effect of carrier mobility is examined to elucidate the experimental results. Trapping parameters are estimated from experiments for simulations, which show that the DC breakdown strength exhibits an inverse power relation with insulation thickness and temperature. Simulation results with hopping mobility in the molecular chain model are found to be more consistent with experimental outcomes compared to Poole-Frenkel mobility.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2021)
Article
Polymer Science
Minhee Kim, Se-Hee Lee
Summary: The study analyzed the impact of accumulated space charge on electric field distortion and breakdown strength in polymeric insulators in an HVDC environment using a bipolar charge transport model. It was found that temperature gradient accelerates the reduction of breakdown strength, and internal energy imbalance caused by polarity-reversal voltage significantly decreases breakdown strength.
Article
Materials Science, Characterization & Testing
Chengcheng Zhang, Xiangqing Kong, Wenxin Liu, Jiaming Yang, Hong Zhao
Summary: Adding PANI nanofibers into LDPE can improve space charge distribution, with doped PANI nanofibers having higher conductivity and more effectively suppressing space charge accumulation, but also reducing the DC breakdown strength of the nanocomposites. Overall, dedoped PANI nanofibers are superior for the DC dielectric properties of LDPE.
Article
Engineering, Electrical & Electronic
Xiaosi Lin, Wah Hoon Siew, John Liggat, Martin Given, Jinliang He
Summary: The study shows that the addition of OvPOSS nanofillers can significantly enhance the electrical performance of polypropylene, leading to reduced DC conductivity, increased breakdown strength, and suppressed space charge accumulation. Therefore, OvPOSS/PP nanocomposites have great potential for HVDC applications.
Article
Energy & Fuels
Xuri Xu, Yu Gao, Jing Li, Zheng Song, Huicun Zhao, Tao Han
Summary: This study investigates the effect of orientation of micro-scale h-BN on charge transport and DC breakdown of PE-based composites through numerical simulation. Results show that when h-BN is perpendicular to the normal vector, the density of trapped charge is the largest and the DC breakdown strength is the highest.
Article
Materials Science, Characterization & Testing
Guimin Jiang, Yuanxiang Zhou, Chenyuan Teng, Yunxiao Zhang, Xin Huang, Luming Zhou, Da Yang
Summary: This study aimed to enhance the electric field uniformity of high-voltage direct current (HVDC) cables by reducing the electrical resistivity-temperature dependence of cross-linked polyethene (XLPE). This was achieved by incorporating BaTiO3-based ceramic fillers with positive temperature coefficient (PTC) electrical resistivity into XLPE. The results showed that the addition of PTC particles significantly improved the electrical resistivity and DC breakdown strength of the sample at high temperatures, which was attributed to the presence of deep traps near the Curie temperature region. The higher the doping content of PTC particles, the better the suppression of the negative temperature coefficient (NTC) effect. The optimum content for DC breakdown strength was found to be about 5 wt%.
Article
Engineering, Electrical & Electronic
Wei Deng, Yuanyuan Ren, Kexin Qu, Hong Zhao
Summary: In this study, a novel graftable voltage stabilizer MDVS was successfully developed to improve the insulation properties of polyethylene. MDVS effectively suppressed space charge accumulation and decreased electrical conductivity in the materials. The MDVS-grafted materials exhibited higher breakdown strength than pristine polyethylene, and the stabilizing effect of MDVS was more efficient than conventional stabilizer DHBP even after high-temperature degassing. Thermally stimulated current tests and quantum chemical calculations supported the improvement of insulation properties by capture and trap mechanisms.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Engineering, Electrical & Electronic
Shihang Wang, Jianying Li, Shengtao Li
Summary: This article introduces crosslinked polyethylene (XLPE) nanocomposite dielectric doped with nano-hexagonal boron nitride (h-BN) and discusses its significant improvements in dc breakdown strength and space charge properties. The doping of h-BN does not introduce impurities or change the crystallinity of the material.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Chemistry, Physical
Muneeb Ahmed, Lisheng Zhong, Fei Li, Nuo Xu, Jinghui Gao
Summary: In this research, crosslinked polyethylene (XLPE) with selective content of dicumyl peroxide (DCP) was developed, and the influence of microstructural properties and chemical composition on the mechanical and direct current (DC) dielectric properties were investigated. The results showed that the increase in DCP content increased the crosslinking degree, reduced the crystallinity/lamella thickness, average molecular weight between two crosslinks, and oxidation level/carbonyl index. The increase in DCP in XLPE samples decreased the permanent elongation and elongation rate. The rise in DCP content increased the crosslinking degree which improved the DC resistivity and activation energy, and increased the DC breakdown strength. The space charge accumulation measurement showed that the increase in DCP reduced the homo-charges and hetero-charges. It was proven that the appropriate DCP content played a vital role in enhancing the DC dielectric performance, internal material characteristics, and mechanical performance of XLPE.
Article
Physics, Applied
Zhen Li, Daomin Min, Huan Niu, Mingru Li, Shengtao Li
Summary: Numerical simulation techniques for surface flashover are still being developed, and a DC surface flashover model is constructed based on a gas-solid coupling model. The model considers the effects of solid, gas, and gas-solid interaction on surface flashover, showing that the surface flashover voltage is influenced by surface trap levels in the solid surface layer. Results suggest that surface deep and shallow traps play different roles in surface charge dissipation and electron emission during surface flashover.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Huiyuan Wu, Shaoke Fu, Wencong He, Chuncai Shan, Jian Wang, Yan Du, Shihe Du, Bangxing Li, Chenguo Hu
Summary: This study reports a fast surface charge injection technique based on air breakdown effect, which allows for directional accumulation of charge and improves the output performance of triboelectric nanogenerator. A novel charge transfer mechanism is proposed, and a method for quantifying surface charge density is given.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Lewei Zhu, Zhonglei Li, Kai Hou
Summary: In this study, the effect of three radical scavengers on the growth of electrical trees in XLPE under a temperature gradient was investigated. It was found that Tinuvin 622 can consistently suppress electrical tree growth as the temperature gradient rises, while all three scavengers can suppress electrical tree growth under a temperature gradient caused by temperature rise on the ground side. The results suggest that Tinuvin 622 has potential for use in high voltage direct current XLPE cable application.
Article
Polymer Science
Liang Cao, Lisheng Zhong, Yinge Li, Jinghui Gao, George Chen
Summary: The study revealed that the increase in crosslinking degree led to enhanced DC breakdown strength but decreased crystallinity, reduced elastic modulus, and lower loss tangent peak temperature for XLPE-PS composites.
Article
Materials Science, Ceramics
H. H. Hegazy, C. Dinesh Sati, Pankaj Sharma, M. A. Jaafari
Summary: The study investigates the composition and temperature-dependent dc conductivity of (Ge20Se18Te62)100-xIx (x = 0 and 8) glasses, revealing the significant effect of iodine content on switching properties and the decrease in threshold voltage with changes in composition, while it increases with temperature and thickness changes. The threshold switching properties could have potential applications in high-speed electronic memory and selector devices.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Qianying Li, Yawen Hu, Qianxi Yang, Xiaochuan Li, Xuemei Zhang, Huake Yang, Peiyuan Ji, Yi Xi, Zhong Lin Wang
Summary: This study demonstrates a constant-voltage DC-TENG (C-DC-TENG) with robust output performance and improved charge density through the ternary dielectric triboelectrification effect. The optimized C-DC-TENG achieves high output charge density and power density, and maintains 100% output after 800,000 cycles. This research provides a promising technique for large-scale clean energy harvesting.
ADVANCED ENERGY MATERIALS
(2023)
Article
Physics, Applied
Zhen Li, Daomin Min, Huan Niu, Mingru Li, Shengtao Li
Summary: Numerical simulation techniques for surface flashover are still being developed, and a DC surface flashover model is constructed based on a gas-solid coupling model. The model considers the effects of solid, gas, and gas-solid interaction on surface flashover, showing that the surface flashover voltage is influenced by surface trap levels in the solid surface layer. Results suggest that surface deep and shallow traps play different roles in surface charge dissipation and electron emission during surface flashover.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Xiaoping Wang, Shusai Zheng, Zhen Li, Shaoming Pan, Weibo Fan, Daomin Min, Shengtao Li
Summary: This paper investigates the surface flashover properties on the vacuum-dielectric interface irradiated by electrons. A 'three-segment' curve is discovered, showing the trend of increasing, decreasing, and stabilizing surface flashover voltage of polyimide with increasing electrode gap distance. Based on the simulation of electron trajectories, a model combining the effects of both kinetic and deposited electrons on surface flashover is proposed. This provides guidance for improving surface flashover voltage during electron irradiation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Kunming Shi, Bin Chai, Haiyang Zou, Daomin Min, Shengtao Li, Pingkai Jiang, Xingyi Huang
Summary: This study investigates the contact electrification and charge dynamics on a typical tribomaterial using in situ methods. The results show that the number of transferred electrons increas with contact force/area and tends to reach saturation under increased friction cycles. The incorporation of high permittivity BaTiO3 nanoparticles enhances the capacitance and electron trapping capability of the nanocomposites, improving the output performance of triboelectric devices.
Article
Engineering, Multidisciplinary
Minzun Ji, Daomin Min, Qingzhou Wu, Wenfeng Liu, Shengtao Li, Shaorui Qin, Shenglong Zhu
Summary: This article investigates the scale and electrical conduction properties of the interfacial regions in electrical insulating polymer nanocomposites. Through simulation and experimentation, it is found that the ordered and tightly aggregated structure induced by the bound effect of nanofillers results in interfacial regions with low conductivity.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Physics, Applied
Daomin Min, Minzun Ji, Ziwei Gao, Zhuoli Cai, Qingzhou Wu, Jie Liu, Shengtao Li, Wenfeng Liu
Summary: Polymer dielectric capacitors are commonly used for high-power-density energy storage, but their energy storage density is low and they cannot withstand high temperatures or achieve high energy density. To improve these aspects, a unified model is needed to study the factors that affect energy storage performance. The bipolar charge transport (BCT) model is used to establish a comprehensive model that considers charge injections, carrier migration, trapping effects, and energy damage. The model accurately predicts breakdown strengths, discharged energy densities, and charge-discharge efficiencies for different materials and temperatures. It reveals that carrier injection and transport are crucial for determining the conductivity, breakdown, and energy storage of linear dielectrics. Coating a layer of SiO2 on BOPP film enhances breakdown strength and reduces heat and distortion, while reducing charge injection and space charge accumulation improves energy density and charge-discharge efficiency.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Polymer Science
Zhijie Yang, Dong Yue, Yuanhang Yao, Jialong Li, Qingguo Chi, Qingguo Chen, Daomin Min, Yu Feng
Summary: This paper reviews the research progress of all-organic polymer dielectrics and emphasizes strategies to enhance both dielectric and energy storage performance. By analyzing the effects of blending, filling, and multilayer structures on all-organic polymer dielectrics, the energy storage applications and prospects of this material are summarized.
Article
Physics, Applied
Zhen Li, Yongsen Han, Ji Liu, Daomin Min, Shengtao Li
Summary: In this study, the temperature-dependent direct current (DC) breakdown mechanisms of epoxy resin (EP)/TiO2 nanocomposites were investigated. The incorporation of nanoparticles reduced space charge accumulation and electric field distortion, while an increase in temperature accelerated space charge accumulation, electric field distortion, and molecular displacement. A DC breakdown simulation model was established to further explore the influence of carrier traps and molecular chain dynamics on temperature-dependent breakdown. The calculated results showed good agreement with experimental data, indicating that the temperature-dependent DC breakdown mechanisms are dominated by the synergistic effects of carrier traps and segment chain dynamics. Furthermore, a transition from segment chain to backbone dynamics was discovered near the glass-transition temperature for DC breakdown of EP/TiO2 nanocomposites.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Fluids & Plasmas
Shaoming Pan, Xiaoping Wang, Daomin Min, Dajian Li, Xiajin Rao, Yi Su, Jian Zhao, Shengtao Li
Summary: This article investigates the effects of negative surface charge on surface flashover using the particle tracking method. The results show that negative surface charge inhibits initial electron emission and flashover initiation, and hinders the multiplication of secondary electrons and flashover development.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Zhaoliang Xing, Chong Zhang, Mengyao Han, Ziwei Gao, Qingzhou Wu, Daomin Min
Summary: This study investigates the breakdown strength of PE nanocomposites by considering the effects of factors such as space charges, electron energy, and molecular chains. The simulation results suggest that the combination of trapping effect and binding effect of molecular chains significantly improves the breakdown electric field of the material.
APPLIED SCIENCES-BASEL
(2022)
Article
Polymer Science
Xiaodi Dong, Baoquan Wan, Yang Feng, Daomin Min, Ming-Sheng Zheng, Haiping Xu, Zhi-Min Dang, George Chen, Jun-Wei Zha
Summary: This study successfully synthesized all-organic polyimide (PI) films with ultra-low permittivity and high hydrophobicity by introducing a fluoroelastomer (FEM). The impact of the fluoroelastomer on the dielectric properties was studied through molecular dynamics simulations and practical tests.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Chemistry, Physical
Yuanwei Zhu, Haopeng Chen, Yu Chen, Guanghao Qu, Guanghao Lu, Daomin Min, Yongjie Nie, Shengtao Li
Summary: This study reveals that surface oxidation-dependent space-charge accumulation can effectively enhance the breakdown and flashover performances of polymeric insulating materials. The functions of surface oxidation on the interfacial barrier of LDPE were investigated through quantitative analysis of space-charge distributions and electric field distortion. The proposed mechanism of surface modification on space-charge behaviors provides guidance for selecting appropriate methods to modify space-charge accumulation and improve the insulating performance of polymeric films for high-voltage applications.
Article
Chemistry, Physical
Minzun Ji, Daomin Min, Yuwei Li, Lingyu Yang, Qingzhou Wu, Wenfeng Liu, Shengtao Li
Summary: Researchers have constructed sandwich-structured PI/BaTiO3 nanocomposites using in-situ synthesis and solution casting techniques, achieving an energy density of 7.44 J/cm3 while maintaining good charge-discharge efficiency. The organic/inorganic interfacial polarization and interlayer polarization significantly increase the dielectric constant. The sandwich structure redistributes the electric field and mitigates the electric field concentration, while the outer insulation layer blocks high current and heat breakdown paths. This work provides a new paradigm for exploring polyimide nanocomposites with enhanced energy density through a combination of experiments and simulations.
MATERIALS TODAY ENERGY
(2023)
Article
Polymer Science
Zhen Li, He Gao, Longfei Zhang, Ji Liu, Huan Niu, Mingru Li, Daomin Min, Shengtao Li
Summary: This study investigates the molecular dynamics and macro-dielectric performances of epoxy nanocomposites. It is found that EP/TiO2 nanocomposites with optimized filler content exhibit improved mechanical, thermal and dielectric properties. The DC breakdown strength of the nanocomposites initially increases and then decreases with temperature, while also significantly decreasing overall.
Article
Engineering, Electrical & Electronic
Poxin Wang, Daomin Min, Xiaofan Song, Ziwei Gao, Yutao Hao, Shihang Wang, Wenfeng Liu
Summary: This research constructs an energy storage and release model considering the charge trapping effects and simulates the high-temperature energy storage properties of polyimide nanocomposite dielectrics. The results show that increasing the charge injection barrier, deep trap energy, and deep trap density can effectively improve the discharged energy densities and energy efficiencies of dielectric capacitors. This study provides theoretical and model support for enhancing the high-temperature energy storage performance of nanocomposites.
IET NANODIELECTRICS
(2023)
Article
Engineering, Electrical & Electronic
Poxin Wang, Daomin Min, Xiaofan Song, Yuanshuo Zhang, Lingyu Yang, Shihang Wang, Shengtao Li
Summary: Linear polymer dielectrics have been widely used in high-energy density capacitors due to their high breakdown strength and lightweight, but their low-energy storage density limits their practical application. By constructing an energy storage and energy release model, the impact of charge hopping barrier and average hopping distance on the energy storage performance of polyetherimide nanocomposites (PEI PNCs) was simulated and analyzed. The findings provide theoretical and model support for insulation design and performance improvement of nanocomposite dielectrics.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
