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Analysis of Optimization Processses for Solid State Fabrication of Olivine Cathode Materials

Title: Analysis of Optimization Processses for Solid State Fabrication of Olivine Cathode Materials.
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Name(s): Oladimeji, Charles, author
Moss, Pedro L., professor directing thesis
Weatherspoon, Mark H., committee member
Andrei, Petru, committee member
Florida State University, degree granting institution
College of Engineering, degree granting college
Department of Electrical and Computer Engineering, degree granting department
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2015
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource (77 pages)
Language(s): English
Abstract/Description: Lithium ion battery discovered since the 1980s has become pivotal to our energy needs. With the need for a shift to renewable energy and increased use of portable devices, energy storage has become a very important aspect of modern day life and technology. In the thesis, optimization techniques for solid state calcination of lithium olivine batteries are characterized and analyzed. A brief introduction into lithium ion battery is discussed, the chemistry and physics of the materials is studied in details. Emphasis is placed on the olivine structure, industrially utilized synthesis method and the performance of olivine lithium ion batteries are also discussed in details. Olivine structure LiFePO₄ (LFP) was synthesized via solid state processes, using Li₂CO₃, NH₄H₂PO₄ and FeC₂O₄·H₂O and C₁₂H₂₂O₁₁ as precursor materials. The effects of calendaring in terms of charge/discharge capacity, cycle life performance, surface morphology, and ac impedance was analyzed. The resulting LFP electrode was divided in part, Part A was left as is and Part B was calendared. The calendared electrode exhibited lower impedance under electrochemical impedance test. The calendared electrode also exhibited a higher discharge capacity of about 130 mAh/g at 0.1C compared to the as-is electrode with discharge capacity of about 120mAh/g. Olivine structure LiMnPO₄ (LMP) was also synthesized via solid state processes, using Li₂CO₃, NH₄H₂PO₄, MnCO₃ and C₁₂H₂₂O₁₁ as precursor materials. Comparison of the carbon addition process was done by adding sucrose to the initial precursor mix and carbon black at the later stages of fabrication. The 3 step carbon addition exhibited the highest specific capacity of about 72mAh/g, 1 step carbon addition possessed the least capacity of about 45mAh/g, while the 2 step process had a capacity of about 65mA/g.
Identifier: FSU_2015fall_Oladimeji_fsu_0071N_12821 (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 2015.
Date of Defense: June 29, 2015.
Bibliography Note: Includes bibliographical references.
Advisory Committee: Pedro L. Moss, Professor Directing Thesis; Mark H. Weatherspoon, Committee Member; Petru Andrei, Committee Member.
Subject(s): Force and energy
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_2015fall_Oladimeji_fsu_0071N_12821
Owner Institution: FSU

Choose the citation style.
Oladimeji, C. (2015). Analysis of Optimization Processses for Solid State Fabrication of Olivine Cathode Materials. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2015fall_Oladimeji_fsu_0071N_12821