Thermogravimetric study of the kinetics of lithium titanate reduction by hydrogen

• Published in: Fusion engineering and design Vol. 89; no. 11; pp. 2738 - 2742
• Main Authors: Sonak, Sagar, Rakesh, R., Jain, Uttam, Mukherjee, Abhishek, Kumar, Sanjay, Krishnamurthy, Nagaiyar
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2014
• Subjects: Activation energy; Atmospheres; Design engineering; Diffraction; Hydrogen reduction; Kinetics; Lithium; Lithium titanate; Reduction; Titanates; X-rays; Lithium titanate; Kinetics; Activation energy; Hydrogen reduction
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2014.07.017

•Li2TiO3 powder is synthesized by the gel combustion route.•Activation energy of reduction of Li2TiO3 by H2 found out to be 27.45kJ/mol H2.•Non-stoichiometric phase of Li2TiO3 is formed in hydrogen atmosphere.•One-dimensional diffusion appears to be the most probable mechanism of reduction. The lithium titanate powder was synthesized by gel-combustion route. The mechanism and the kinetics of hydrogen interaction with lithium titanate powder were studied using non-isothermal thermogravimetric technique. Lithium titanate underwent reduction in hydrogen atmosphere which led to the formation of oxygen deficient non-stoichiometric compound in lithium titanate. One-dimensional diffusion appeared to be the most probable reaction mechanism. The activation energy for reduction of lithium titanate under hydrogen atmosphere was found to be 27.4kJ/mol/K. Structural changes after hydrogen reduction in lithium titanate were observed in X-ray diffraction analysis.