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. / A Thesis submitted to the Department of Electrical and Computer Engineering in partial fulfillment of the Master of Science. / Summer Semester 2015. / June 29, 2015. / Includes bibliographical references. / Pedro L. Moss, Professor Directing Thesis; Mark H. Weatherspoon, Committee Member; Petru Andrei, Committee Member.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_291322 |
| Contributors | Oladimeji, Charles (authoraut), 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) |
| Publisher | Florida State University |
| Source Sets | Florida State University |
| Language | English, English |
| Detected Language | English |
| Type | Text, text |
| Format | 1 online resource (77 pages), computer, application/pdf |
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