A New Approach for Optimizing a Bipolar Charge Transport Model for Dielectric Materials: Theoretical Framework

Hallak, Khaled; Baudoin, F.; Griseri, V.; Bugarin, Florian; Segonds, Stéphane

doi:10.1109/tdei.2021.009450

Cited by 9 publications

(11 citation statements)

References 10 publications

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“…According to Equation ( 8), the Q tsd increases from 8.52 nC of PEI to 18.6 nC of PEI-BTO_nfs and 50.5 nC of PEI-BNBTO_nfs with 3 vol%, indicating larger trap site density of PEI-BNBTO_nfs nanocomposite. To better visualize the effect of trapping characteristics on the charge transfer process in the nanocomposites, the charge transport characteristics were simulated by the phase-field method based on a bipolar charge transport model [52,53]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Nanofiber-reinforced polymer nanocomposite with hierarchical interfaces for high-temperature dielectric energy storage applications

et al. 2023

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Flexible polymer nanocomposites reinforced by high-dielectric-constant ceramic nanofillers have shown great potential for dielectric energy storage applications in advanced electronic and electrical systems. However, it remains a challenge to improve their energy density and energy efficiency at high temperatures above 150°C. Here, we report a nanofiber-reinforced polyetherimide nanocomposite employing BN-BaTiO 3 heterogeneous nanofibers as fillers, where the BN nanoparticles were embedded inside BaTiO 3 nanofibers to create BN/BaTiO 3 /PEI hierarchical interfaces. The high dielectric constant and the geometric large aspect ratio of the BN-BaTiO 3 heterogeneous nanofibers lead to simultaneously increased dielectric constant and breakdown strength of the nanocomposite over a broad temperature range. In particular, the emerging hierarchical BN/BaTiO 3 /PEI interfaces enable promoted density and energy level of traps for the mobile charges, which further suppresses the conduction loss and improves the breakdown strength under high temperatures, as confirmed by a combination of thermally stimulated depolarization current measurement and phase-field simulation.Finally, the nanocomposite with hierarchical interfaces boosts an ultrahigh energy density of 5.23 J cm −3 with an energy efficiency of > 90% at 150°C, which is the highest energy density reported so far in nanofiber-reinforced polymer nanocomposites and also outperforms most nanocomposites counterparts dispersed with nanoparticles and nanosheets. Our work demonstrates hierarchical interface engineering as an effective strategy to promote the high-temperature energy storage performance of fiber-reinforced polymer nanocomposites, which is of significance for their applications in high-temperature harsh conditions.

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Section: Resultsmentioning

confidence: 99%

Nanofiber-reinforced polymer nanocomposite with hierarchical interfaces for high-temperature dielectric energy storage applications

et al. 2023

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“…In the literature, most of the presented BCT models consider the trapping and detrapping rates independent of the electric field (Le Roy et al , 2004; Hallak et al , 2020; Thomas et al , 2011; Hallak et al , 2021; Hoang et al , 2016). Nevertheless, some works have addressed experimentally and theoretically the relationship between trapping and detrapping phenomena and the electric field (Kim et al , 2020; Doedens et al , 2020).…”

Section: Bipolar Charge Transport Modelmentioning

confidence: 99%

“…A previous study (Hallak et al , 2021) showed that incorporating several experiments into the optimization process improves the method’s convergence rate toward the global set of parameters. In our case, experiments are considered with varying electric fields while the temperature was fixed for all experiments.…”

Section: Introductionmentioning

confidence: 99%

Refining the physical description of charge trapping and detrapping in a transport model for dielectrics using an optimization algorithm

Hallak,

Baudoin,

Griseri

et al. 2023

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Purpose The purpose of this paper is to optimize and improve a bipolar charge transport (BCT) model used to simulate charge dynamics in insulating polymer materials, specifically low-density polyethylene (LDPE). Design/methodology/approach An optimization algorithm is applied to optimize the BCT model by comparing the model outputs with experimental data obtained using two kinds of measurements: space charge distribution using the pulsed electroacoustic (PEA) method and current measurements in nonstationary conditions. Findings The study provides an optimal set of parameters that offers a good correlation between model outputs and several experiments conducted under varying applied fields. The study evaluates the quantity of charges remaining inside the dielectric even after 24 h of short circuit. Moreover, the effects of increasing the electric field on charge trapping and detrapping rates are addressed. Research limitations/implications This study only examined experiments with different applied electric fields, and thus the obtained parameters may not suit the experimental outputs if the experimental temperature varies. Further improvement may be achieved by introducing additional experiments or another source of measurements. Originality/value This work provides a unique set of optimal parameters that best match both current and charge density measurements for a BCT model in LDPE and demonstrates the use of trust region reflective algorithm for parameter optimization. The study also attempts to evaluate the equations used to describe charge trapping and detrapping phenomena, providing a deeper understanding of the physics behind the model.

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“…The transportation models created afterwards typically represent the carrier injection at the electrode through the Schottky emission mechanism [2][3][4][5][6][7][8][9]. The charge injection process is a crucial step in charge transport, used to identify the origin of charge in the transport model.…”

Section: Introductionmentioning

confidence: 99%

Method for determining the Schottky injection barrier at the interface of a metal electrode with insulating oil or pressboard

Chen,

Gao,

et al. 2024

J. Phys. D: Appl. Phys.

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The Schottky injection barrier plays a crucial role in determining the charge movement and migration process, yet its electric field and temperature properties remain unclear. The precise determination of the Schottky injection barrier value is essential for understanding the charge migration dynamics at the interface between the metal electrode and the oil-pressboard insulating medium. This study introduces a computational approach to determine the Schottky injection barrier, derived from classical Schottky emission theory. The methodology employed in this research aligns with previous studies, utilizing the Schottky emission current mechanism to describe steady-state conduction current. Results indicate that the Schottky injection barrier increases with temperature, with a 17.09% rise for oil-electrode and an 8.3% increase for pressboard-electrode in the temperature range of 299 K to 353 K. These temperature-dependent variations are attributed to the negative temperature dependence of the Fermi energy levels of the metal electrodes. Furthermore, the impact of electric field strength on the Schottky injection barrier is found to be minimal. By developing a bipolar charge transport simulation model and validating the injection barrier for 0.5 mm oil-immersed pressboard, this study confirms the accuracy of the calculated Schottky injection barrier. The insights provided in this research could aid in simulating charge transport and analyzing charge characteristics in oil-paper/pressboard insulation systems.

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A New Approach for Optimizing a Bipolar Charge Transport Model for Dielectric Materials: Theoretical Framework

Cited by 9 publications

References 10 publications

Nanofiber-reinforced polymer nanocomposite with hierarchical interfaces for high-temperature dielectric energy storage applications

Nanofiber-reinforced polymer nanocomposite with hierarchical interfaces for high-temperature dielectric energy storage applications

Refining the physical description of charge trapping and detrapping in a transport model for dielectrics using an optimization algorithm

Method for determining the Schottky injection barrier at the interface of a metal electrode with insulating oil or pressboard

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