Authors A.N. Belov, M.V. Kislitsin, A.A. Stroganov, A.V. Sysa, V.I. Shevyakov
Month, Year 09, 2015 @en
Index UDC 538.911
Abstract It has been shown that increasing the capacity of lithium-ion batteries is possible when using the electrodes with high effective surface area, which is porous and crystalline anode metal oxides such as titanium oxide, which is an array of nanoscale columns, the geometrical parameters which may change by varying the technological features of its formation. It is noted that the conformal deposition of carbon layers on the developed surface of such structures will increase the surface of the cathode is several times. The results of the study technology of synthesis of nanostructured composite based on titanium oxide coated with ultra-thin graphite layers. We demonstrate this particular form of titanium oxide, having a columnar structure, two-layer coating by anodic oxidation of titanium–aluminum. Such a shape of the surface of the nanostructure is associated with the movement of the front along the titanium oxide formation pore alumina in the oxidation process. In particular it is shown that the titanium oxide having a maximum effective surface area can be obtained by using an electrolyte based on oxalic acid. The results of the study of transmission electron microscopy and Raman spectroscopy proved the possibility of deposition of ultra-thin layers of graphite. It is found that the amount of graphite monolayers increased from the upper portion to the pillars of the titanium base. The minimum amount of graphite monolayers (IG/I2D = 0,5–0,8) formed in the top of the column and at the approach to the base number is growing. At the base of the pillars have the intensity ratio IG/I2D= 1,8–2,5. In our opinion this is due to size effects arising from the small radius of curvature of the nanocrystals. Showed an increase in surface area based on the synthesized composite 9.5 times.

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Keywords Lithium-ion battery; composite; graphite; titanium oxide; ultra-thin layer; pyrolysis of ethanol; an array of nanoscale columns; nanostructure
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