A sonochemical approach for the synthesis of thermally stable mesoporous microspheres of TiO2 for use as high performance anodes for Li-ion batteries. (29th June 2016)

• Record Type: Journal Article
• Authors: Sunkara, Satyendar; Munichandraiah, N.; Varma, K. B. R.; Shivashankar, S. A.
• Is Part Of: New journal of chemistry. Volume 40:Number 8(2016:Aug.)
• Page Start: 7197
• Page End: 7203
• Publication Date: 2016-06-29
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c6nj00470a
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Microspheres of anatase TiO2 exhibiting excellent cycling stability as anode materials for Li-ion batteries have been prepared by sonochemical synthesis. Abstract : A facile, surfactant-free sonochemical synthesis route at a relatively low temperature was employed to prepare mesoporous microspheres of anatase titanium dioxide (TiO2 ), using the heteroleptic (mixed-ligand) complex, bis-isopropoxy-bis-tertiarybutylacetoacetatotitanium, [Ti(O i Pr)2 (tbaoac)2 ], as the precursor. The transformation of the as-prepared material into crystalline TiO2 was achieved by heating in air at 500 °C. Interestingly, the material retained its pure anatase phase even after heating at 800 °C. The as-prepared sample and the heated ones were characterized by powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), and electron microscopy (SEM, TEM) which, together, revealed that the spheres are mesoporous and, significantly, hollow. As an anode material in a Li-ion battery, the titania microspheres exhibited a high reversible capacity of 212 mA h g −1 after 100 charge and discharge cycles and displayed excellent cycling stability.