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Explosion Synthesis For Nanometer Composite Oxides With Li

Posted on:2008-10-11Degree:DoctorType:Dissertation
Country:ChinaCandidate:X H XieFull Text:PDF
GTID:1101360218453617Subject:Engineering Mechanics
Abstract/Summary:PDF Full Text Request
The major part of this research consists of studies on explosion synthesis methods, characterization, and applications of nanoscale oxides with lithium ion. The second part involves studies of design of water-containing explosives and calculation of detonation parameters for inorganic powder materials for lithium ion batteries and lithium ion sieves.Lithium composite oxide powders are very important microporous materials. They have been used widely as bulk materials in catalysis, separations, chemical sensors, and batteries, due to their unique tunnel structures and useful properties. Novel methods have been developed to synthesize novel nanoscale lithium manganese oxides (LMO), lithium zinc oxides (LZO) and metal-substituted LMO materials in order to modify their physical and chemical properties and to improve their catalytic applications. Different synthetic routes were investigated to find better, more sustainable, faster, and cheaper pathways on a batch production to produce nanoscale or metal-substituted LMO materials. In the synthetic study of nanosize LMO, LZO and metal-substituted LMO materials, a combination of explosion synthesis and solid-state combustion reaction was used to prepare transition metallic oxide powders. Preparative parameters of synthesis, such as detonation pressures, detonation temperature, calcinations temperature and time, were investigated in these combination syntheses of nanometer powders. Effect of properties of these nanometer oxides on the microstructure has been discussed. The catalytic activities of the novel synthetic nanoscale products has been evaluated on lithium ion adsorption abilities and circle properties of lithium ion batteries and were found to be much higher than their corresponding bulk materials.The propagation of unideal explosions of emulsion explosives arising reaction steps involving a competition between exothermic and endothermic reactions (pathological detonations) has been discussed. To predict the stability of emulsion explosives, X-Ray Diffractometer (XRD) and Scanning Electron Microscopy (SEM) have been used. Furthermore, for the criterion of deflagration, the explosive soot can be distinguished by XRD and Transmission Electron Microscope (TEM). The Dulong-Petit's law has been also used to predict specific heats for carbon, metallic oxides and liquid phase H20. Temperatures of detonation and explosive formulations are predicted by using thermochemistry information.
Keywords/Search Tags:Battery Active Materials, Spinel Lithium Manganates, Lithium and Zinc Ceramic Powders, Deflagration to Detonation Transition, Lithium Ion Sieves
PDF Full Text Request
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