Synthesis of Mixed Na2Ti3O7/Na2Ti6O13 Sodium Titanates with Different Phase Ratios and Their Lithium Insertion Properties

Wednesday, 31 May 2017
Grand Ballroom (Hilton New Orleans Riverside)
O. Cech (Brno University of Technology, Centre for Research and Utilization of Renewable Energy), P. Vanýsek (CEITEC – Central European Institute of Technology, BUT), K. Částková (CEITEC - Central European Institute of Technology), and P. Čudek (Brno University of Technology, Czech Republic)
Sodium titanate nanorods consisting of two phases were successfully synthesized by microwave assisted hydrothermal synthesis. The electrochemical behavior during lithium ion insertion and deinsertion was studied depending on the different ratio of Na2Ti3O7/Na2Ti6O13 in the sample. Hydrothermally treated precipitates were calcined at temperatures 700°C, 800°C and 900°C. The purity and crystallographic composition of the samples were examined by XRD and the morphology was observed by SEM. Electrochemical behavior was studied by cyclic voltametry and galvanostatic cycling, all measurements were performed in three electrode cells with metallic sodium as counter and reference electrodes. Samples with three phase compositions were prepared: pure trititanate Na2Ti3O7, pure hexatitanate Na2Ti6O13 and mixture of both in the ratio of 42% Na2Ti3O7 to 58% Na2Ti6O13. Best capacity achieved by prepared samples was 145 mAh/g at 0.1C.