Masters Theses

Keywords and Phrases

Atomic Layer Deposition; Density Functional Theory; Electrospinning; Grain Boundary; Lithium Ion Battery; Nanofiber

Abstract

“Battery performance and its degradation are determined by various aspects such as the transport of ions and electrons through heterogeneous internal structures composed of constituent particles, kinetic reactions at the interfaces, and a corresponding interplay between mechanical, chemical, and thermal responses. Further, modern battery materials require a variety of engineering processes such as coating, doping and mixing. As a result, in order to fully understand the behavior of the battery material and improve battery performance, it is necessary to understand and control the individual particle behavior and then connect it to the electrode. This study elucidated the physical phenomena associated with coating and grain boundaries and addressed the impact on cell-level performance. We also studied how to improve battery performance by changing the material and geometry of electrode components. The study was divided into three topics. First, it has been proved how an optimal layer thickness of CeO2 layer by ALD is better than too think or too thick layer in terms of li-ion diffusion, transition metal-ion dissolution and mechanical damage. Second, it was shown that how grain boundary can improve the cell performance significantly. Grain-boundary possesses different diffusion co-efficient than the bulk and thus the performance is different than the electrodes where no grains are considered. Also, it was shown how grain boundary has impact on stress generation for both cathode and anode particles. Finally, an attempt has been made to use Ni-VOx based nanofiber supported with carbon nanofiber to be used as an anode for advanced li-ion battery. Not only the process is simple but also the cell showed improved reversibility at a current rate of 100 mA/g”--Abstract, page iv.

Advisor(s)

Park, Jonghyun

Committee Member(s)

Pan, Heng
Dogan, Fatih

Department(s)

Mechanical and Aerospace Engineering

Degree Name

M.S. in Mechanical Engineering

Comments

The authors gratefully acknowledge financial support from the National Science Foundation (CBET 1510085) and the Missouri University Research Award (UMRB FEB2015).

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2018

Journal article titles appearing in thesis/dissertation

  • Unveiling the role of CeO2 atomic layer deposition coatings on LiMn2O4 cathode materials: An experimental and theoretical study
  • Micro-macroscopic modeling of a lithium-ion cell by considering grain boundaries of active materials
  • Synthesis of nano-fibrous nickel cocooned VOx anode for high performance Li ion battery

Pagination

x, 78 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2018 Susmita Sarkar, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 12050

Electronic OCLC #

1313117329

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