Space Charge Behavior in Epoxy‐Based Dielectrics: Progress and Perspective (Adv. Electron. Mater. 10/2022)

Liu, Peng; Xie, Zili; Pang, Xi; Xu, Tianlei; Zhang, Siyu; Morshuis, P.H.F.; Li, He; Peng, Zongren

doi:10.1002/aelm.202270054

Cited by 5 publications

(6 citation statements)

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“…The dielectric characteristics of the XLPE are closely associated with the charge carriers' movement, and the trap characteristics greatly affect the transport and dissipation of the charge carriers. 20 Therefore, to investigate the mechanism of the voltage stabilizer for improving the electrical performance of XLPE, calculating the distribution of the traps in different samples is of great significance. Figure 9 exhibits the surface potential decay results and the trap characteristics of the XLPE and XLPE-G.…”

Section: Discussionmentioning

confidence: 99%

Insulation properties enhancement of crosslinked polyethylene by grafting electron‐buffering voltage stabilizers

Hong,

Chen,

Zhu

et al. 2023

J of Applied Polymer Sci

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Grafting a voltage stabilizer on molecular chains of cross‐linked polyethylene (XLPE) can effectively improve the materials' insulation properties. Four different samples (XLPE, XLPE grafted with the voltage stabilizer, low‐density polyethylene (LDPE) blended with the voltage stabilizer, and LDPE grafted with the voltage stabilizer) are prepared in this paper. Several physicochemical and dielectric tests are performed to investigate the properties of the samples. The results demonstrate that the m‐aminobenzoic acid is successfully grafted onto the XLPE molecular chain. Moreover, the crosslinking and grafting processes are equally important for enhancing the materials' performance of the XLPE. In addition, the grafted voltage stabilizer negligibly affects the gel content and thermal properties of XLPE. However, it increases the crystallinity but decreases the lamella thickness. Moreover, the XLPE grafted with a voltage stabilizer has lower direct current (DC) electrical conductivity, less aggregation of space charge, and higher DC breakdown strength. The trap distribution results indicate that the voltage stabilizer introduces shallow traps in the sample and the quantum chemical calculations describe that the material bandgap is decreased. Thus, the high‐energy charge carriers are buffered by the newly‐introduced traps and the functional groups, leading to the enhanced material properties of the XLPE.

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Section: Discussionmentioning

confidence: 99%

Insulation properties enhancement of crosslinked polyethylene by grafting electron‐buffering voltage stabilizers

Hong,

Chen,

Zhu

et al. 2023

J of Applied Polymer Sci

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show abstract

“…Optical methods, such as the Pockels and the Kerr effect, are suitable for testing charges in thin solid samples and liquids, respectively. [ 11,139 ] Thermal methods, comprising the thermal pulse method (TPM), thermal step method (TSM), and laser intensity modulation method (LIMM), are also used for measuring charges. [ 56,140 ] Acoustic methods, such as the PEA and PWP methods, have been used extensively.…”

Section: Experimental Techniques Of Interface Chargesmentioning

confidence: 99%

“…The recent development of power electronic devices has introduced more complex voltages that are applied to dielectric insulation systems. [ 11,193–195 ] Hence, it is necessary to understand the effects of frequency and waveform on bulk and interface charge characteristics for insulation design and evaluation. Figure a shows the applied electric field waveform, which is a unipolar square wave.…”

Section: Interface Charge Characteristicsmentioning

confidence: 99%

“…Interfaces created by solid–solid and solid–liquid polymer dielectrics have been widely used in advanced electronic devices and power equipment ( Figure ), [ 1–5 ] including multi‐layered dielectric contact regions in high voltage cables, [ 6–9 ] winding and dielectric contact regions in solid‐state transformers, [ 10 ] and filler/matrix contacts in composite materials for electronic device packaging. [ 11 ] Under the electric field, the interface charges are formed within various regions, indicating an improvement in electro‐acoustic, [ 12 ] electro‐optic, [ 13 ] and electro‐thermo [ 14 ] conversions in the flexible transducers. Additionally, interface charges accumulate in the narrow regions, resulting in field distortion and device degradation.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, acoustic, thermal, and optical methods are widely used for measuring space charges in dielectric structures. [ 11,56,57 ] These methods can also measure interface charges for some specific structures. Among them, acoustic methods such as pulsed electro‐acoustic (PEA) and pressure wave propagation (PWP), present favorable applications in polymer dielectric systems.…”

Section: Introductionmentioning

confidence: 99%

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Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

Wang

et al. 2023

Adv Materials Inter

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Interfaces are essential components in polymer contact systems, which widely exist in electronic devices and power equipment. Interface charge originating from the mismatch of the electronic structure in interfaces is one of the key issues to modify the device performance due to its multifunctional migration and accumulation behaviors. Hence, the detection and analysis of the interface charge characteristics are of great importance to deeply understand the polymer contact system in various devices. This paper presents an overview of recent research progress in the interface charge properties at dielectric interfaces. Based on the theoretical analysis of the MWS polarization and electronic localized states, two typical approaches of discussing the interface charges from micrometer to millimeter are mainly studied. Acoustic method is prevalent in detecting the space charge in various dielectrics. However, owing to its limited resolution (several µm), it is difficult to clarify the charge distributions at the interface with a micro‐scale. Probe microscopy presents a promising technique due to its flexible surface potential detection at a submicron scale. The challenges and prospects of acoustic and probe microscopy methods are discussed in this paper. The advanced techniques of interface charges can promote the development of new energy electronic devices.

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Interfacial Engineering Using Covalent Organic Frameworks in Polymer Composites for High‐Temperature Electrostatic Energy Storage

Xie,

Le,

et al. 2024

Adv Funct Materials

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The use of inorganic nanofillers has been an effective method to improve high‐temperature capacitive performance of dielectric polymers, though there are unmet challenges such as undesirable organic–inorganic compatibility, and low efficiencies and energy densities. Herein, a surface functionalization strategy using covalent organic frameworks (COFs) is employed to address such challenges in realizing high‐performing polymer composites. Specifically, core–shell structured nanoparticles, where ZrO2 nanoparticles act as the core and a COF material forms the shell, are constructed and composited with the polyetherimide (PEI) matrix. The design leverages the high electron affinity (EA) of the outer COF shell to create energy traps, thereby capturing free charges and limiting electrical conduction. Concurrently, the low EA and wide bandgap of the ZrO2 core introduce energy barriers to impede charge injection and migration. This orchestrated “energy level cascade” results in a marked reduction of leakage current and energy loss. The resulting polymer composite showcases an impressive discharged energy density of 6.21 J cm−3 at an efficiency above 90%, with a maximum discharged energy density reaching 7.43 J cm−3 at 150 °C. These performance metrics position the PEI/ZrO2@COF polymer composite to surpass or be on par with state‐of‐the‐art high‐temperature PEI composites and other advanced polymer dielectrics.

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Space Charge Behavior in Epoxy‐Based Dielectrics: Progress and Perspective (Adv. Electron. Mater. 10/2022)

Cited by 5 publications

References 0 publications

Insulation properties enhancement of crosslinked polyethylene by grafting electron‐buffering voltage stabilizers

Insulation properties enhancement of crosslinked polyethylene by grafting electron‐buffering voltage stabilizers

Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

Interfacial Engineering Using Covalent Organic Frameworks in Polymer Composites for High‐Temperature Electrostatic Energy Storage

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