Date of Award

1-1-2001

Thesis Type

Masters

Document Type

Thesis

Divisions

Faculty of Science

Department

Department of Chemistry

Institution

Universiti Malaya

Abstract

In this study, several lithium intercalation compounds have been synthesized and characterized. Lithium manganese copper oxide cathode materials were prepared by sol gel method using tartaric acid as the gelating agent. Five types of cathode materials were synthesized. The sol gel technique has permitted the synthesis of manganese oxides that are capable of reversibly intercalating large amounts of lithium ions. To see the effect of adding copper to lithium manganese oxide several experiments were carried out. These include X-Ray diffraction to see whether the LiMn₂O₄ lattice has widened or collapsed. It was seen that LiMn₂O₄ and LiCu₂O₂ XRD patterns were obtained as reported in the literature. XRD of other three materials has no references so EDAX experiment was done to show the ratio of metals synthesized which were compared with the amount of the starting material. Particle Size Distribution experiment was done where the materials was ground to obtained a grain size at about 6µm and SEM results show the shape of the grain size which is important for a good performance of cathode materials. TGA studies of the piecursors show evidence for phase formation of the compound for temparature range of 250°C to 500°C. FTIR spectrum for LiMn₂O₄ and LiMn₁.₅Cu₀.₅O₃ that were calcined at 800°C show no impurities in the compounds. The amount of copper was found to be the factor that, effect the purity of the other three compounds. Cyclic voltammetry results give a redox curves, implies that intercalation and de-intercalation of lithium are occurring.

Initial

snms

Additional Information

Dissertation (M.A) -- Faculty of Science, Universiti Malaya, 2001.

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