Dissertation
Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Controlled Synthesis and Application Exploration of Titanium Oxide and Its Carbon Composite Nanomaterials

Author LiuJing
Tutor SunXiaoMing
School Beijing University of Chemical Technology
Course Chemistry
Keywords Titanium dioxide Titanium oxy compounds Micro- nano composite materials Lithium-ion battery anode material
CLC TB383.1
Type Master's thesis
Year 2011
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This thesis around titanium oxides and their work with the control the synthesis and properties of carbon composite materials design and synthesis of TiO2 nano- rods with carbon of the sea urchin -like self-assembly of micro-nano composite titanate nanocrystals , etc. and TiO2-C micro - nano composite materials in the performance of the lithium-ion battery electrode materials with initial exploration , the inherent relationship between the preliminary interpretation of the structure and properties . By solvothermal method using titanium tetrachloride hydrolysis , glucose dehydration carbonation and esterification reaction step synthesis of a novel TiO2 nano- rods and carbon self-assembly of micro-nano composite materials , and designed a series of comparative experimental system to study a variety of synthetic conditions , such as the type of titanium source , the concentration , the kind of alcohol , the reaction temperature and time , the filling degree , the amount of glucose- , heat treatment temperature and the seed crystal is the impact on the morphology and structure . Furthermore, by controlling the synthesis conditions to obtain a TiO2 @ C nanoparticles . Testing means of SEM, TEM, Raman, XRD showed that the novel TiO2-C composite material is 10-20 nm of TiO2 nano-rods closely arranged and pointing to the center of the sphere , and wherein the carbon uniformly dispersed structure of sea urchin - like assembly , the diameter of about 500 nm -10μm. The electrochemical tests showed that the composite material has a better than the capacity and cycle characteristics . 600 ℃ deal with a carbon content of 20 wt% samples cycle of charge and discharge current of 30 mA · g-1 in the 1-3 V TiO2 initial discharge capacity of 335mAh · g-1, a TiO2 0.78 Li can be reversibly embedded . 700 ℃ deal with a carbon content of 1.7 wt% sample current of 20 mA · g-1 in the first discharge capacity of 0.1-3V test 263.7mAh · g-1, remains 244.6mAh · g - 1 cycle 70 times . Titanate nanocrystals synthesized using a hydrothermal and solvothermal method . By controlling the alkalinity , the kind of solvent and the volume , TiO2 added in an amount , and other conditions to achieve the control of the morphology and structure of the titanate , and synthesized having the desired crystal structure of titanate nanosheet and nanotubes . The results confirmed that the alkalinity of the most important factors affects the morphology and structure , the addition of the low boiling organic solvent is conducive to the formation of nanotubes . Through the exchange of lithium-ion and lithium hydroxide , further synthesized rock salt type LiTiO2 nanosheets its associated performance needs further study .

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