Doctoral Dissertations

Xuhui Lu

Abstract

"The purpose of this research was to develop dielectric films for high energy density capacitor applications. Also desired was to develop a deeper understanding of dielectric breakdown and electric energy storage related phenomena through simulation, theoretical analysis, and experimental investigation.

An analytical model incorporating Weibull dielectric strength statistics was developed to establish quantitative relationships between material properties and device performance of self-healing capacitors. The model is useful for designing high voltage capacitors and developing dielectric materials where the effects of electric field-dependent permittivity need to be considered.

In the experimental work, solution-cast poly(vinylidene difluoride) (PVDF) homopolymer PVDF films with high breakdown strength were fabricated and studied for the application of high voltage, single section winding, self-healing capacitors. The quantitative correlations between thermal annealing conditions, electrical properties, and performance were investigated.

For the computer simulation work, the electric field distribution, field and power density enhancement factors, power loss, and stored electric energy of dielectric composites were calculated using the boundary element method (BEM). The composite structures consisted of a low permittivity host containing spherical inclusions that have functionally graded dielectric permittivities or electrical conductivities.

Preliminary experimental work has also been conducted to investigate the effects of polymer blending on Wei bull dielectric strength and other energy storage properties of PVDF"--Abstract, page iv.

Advisor(s)

Huebner, Wayne
Schwartz, Robert W.

Committee Member(s)

Hilmas, Greg
OKeefe, Matt
DuBroff, Richard E.

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Materials Science and Engineering

Sponsor(s)

United States. Office of Naval Research
United States. Army
United States. Air Force

Comments

Financial support through a MURI program sponsored by Office of Naval Research (Grant No. N000-14-05-1-0541)

Publisher

Missouri University of Science and Technology

Publication Date

2012

Journal article titles appearing in thesis/dissertation

  • Design optimization of high energy density dielectrics using Weibull dielectric strength parameters
  • Effects of processing conditions on the dielectric strength and energy storage properties of solution-derived PVDF films
  • Modeling permittivity and conductivity contrast on electric energy storage properties of dielectric composites

Pagination

xiv, 158 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2012 Xuhui Lu, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Dielectric filmsEnergy storageDielectrics -- Mathematical models

Thesis Number

T 10644

Print OCLC #

922573222

Electronic OCLC #

922573131

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