The statement of the problem is to develop an environmental friendly, cost effective cathode material with the technical requirements to withstand the energy demand of directly storing electricity for the uses in today society. The author solved the problem by designing a water soluble, thermally stable organic moiety that is used as fuel and a template in the low temperature solution combustion synthesis of cathode materials utilized in lithium-ion energy storage devices. The Green Soft Chemical method (MADHAMS) is a useful alternative solution-combustion method for the synthesis of highly pure, fine-sized, spherical & cubic cathode powders. With the global demand pushing industrial applications toward green chemistry, we developed this technique with environmental friendly solvents. This MADHAMS method would fall within the “Self-Propagation Combustion Synthesis (SPCS)” family. SPCS is a family of methods that utilize metal nitrates as conventional oxidants and organic compounds as fuels. As the nitrate decomposes and the fuel is oxidized, energy is released into the local system as heat energy. The energy can be controlled by the metal-ion-to-fuel ratio. As part of this study, the properties and characteristics of the cathode powders prepared by a green soft chemical method are extensively investigated.
This report also describes the non-isothermal investigation of the dependence of the activation energy on the extent of conversion of lithium cobalt dioxide using the iso-conversional method of Friedman. Lithium cobalt dioxide was prepared by the direct reaction of lithium carbonate and cobalt oxide. Cobalt oxide was prepared from the thermal decomposition of Cobalt (II) propenoate so that the starting materials used in the kinetic investigation would closely resemble or represent the natural decomposition products that are produced during the green soft chemical synthetic methods. The kinetic analysis of the variation in Eα with α revealed that this solid-state reaction undergoes a multi-step process. The average activation energy calculated was used to optimize the metal-ion-to-fuel ratio of the solution combustion synthetic method. The green chemical method developed in this dissertation was determine to be a viable option for a cost effective and scalable green chemical engineering process to synthesize cathode materials.
|Advisor:||Walker, Edwin H.|
|Commitee:||Martinez-Ceballos, Eduardo, Miller, Robert H., Owens, John W., Shujaa, Mwalimu|
|School:||Southern University and Agricultural and Mechanical College|
|Department:||Environmental Toxicology (ENTX)|
|School Location:||United States -- Louisiana|
|Source:||DAI-B 73/04, Dissertation Abstracts International|
|Subjects:||Inorganic chemistry, Physical chemistry, Energy, Materials science|
|Keywords:||Cathode materials, Energy storage, Lithium cobalt dioxide, Lithium ion battery, Lithium nickel dioxide, Organic fuel|
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