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Simulation of Li-Ion Coin Cells Using COMSOL Multiphysics

Title: Simulation of Li-Ion Coin Cells Using COMSOL Multiphysics.
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Name(s): Chepyala, Seshuteja, author
Moss, Pedro L., professor directing thesis
Weatherspoon, Mark H., committee member
Andrei, Petru, committee member
Florida State University, degree granting institution
FAMU-FSU College of Engineering, degree granting college
Department of Electrical and Computer Engineering, degree granting department
Type of Resource: text
Genre: Text
Master Thesis
Issuance: monographic
Date Issued: 2017
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource (81 pages)
Language(s): English
Abstract/Description: Lithium batteries have played an important role since early 1980’s to provide us with energy for small portable devices. Due to the increasing demand and limited availability of fossil fuels there is a need to shift to renewable energy. In this thesis, the fabrication procedure for the lithium ion coin cell is extensively analyzed. A brief introduction into the lithium ion battery is discussed, the physics and chemistry of the materials is explained. Emphasis is made on the importance of calendaring an electrode. LiFePO4 was mixed with the Super P, PVDF and NMP at appropriate stoichiometric amounts and half coin cells were produced with the reference electrode as lithium foil. The effects of calendaring in terms of discharge capacity, density profile and ac impedance was analyzed. The resulting material sample were analyzed in two parts, Sample A was left as is and Sample B was calendared. The calendared electrode exhibited a lower impedance when observed with the impedance test. The calendared electrode exhibited a higher discharge capacity of about 162 mAh/g at C/10 rate when compared to the uncalendared electrode with a discharge capacity of about 152 mAh/g at C/10. The experimental results were than compared to the simulated model constructed in Comsol Multiphysics. The coin cell model in COMSOL was started with use of the existing model for cylindrical cells. The parameters and equations required for the setup were analyzed and discussed. The comparison of the experimental vs simulated results yielded some preliminary information. However, this work is still in progress, for building further models with different materials for the coin cells.
Identifier: FSU_SUMMER2017_Chepyala_fsu_0071N_14110 (IID)
Submitted Note: A Thesis submitted to the Department of Electrical and Computer Engineering in partial fulfillment of the Master of Science.
Degree Awarded: Summer Semester 2017.
Date of Defense: July 17, 2017.
Bibliography Note: Includes bibliographical references.
Advisory Committee: Pedro L. Moss, Professor Directing Thesis; Mark H. Weatherspoon, Committee Member; Petru Andrei, Committee Member.
Subject(s): Electrical engineering
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_SUMMER2017_Chepyala_fsu_0071N_14110
Owner Institution: FSU

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Chepyala, S. (2017). Simulation of Li-Ion Coin Cells Using COMSOL Multiphysics. Retrieved from http://purl.flvc.org/fsu/fd/FSU_SUMMER2017_Chepyala_fsu_0071N_14110