Abstract
Lithium manganese titanium oxide Li2.7MnTi3O9 with the Na2.08Ti4O9-type tunnel structure was prepared at 270 °C via ion-exchange reaction using the starting compound Na2.7MnTi3O9 in molten salts of LiNO3 and LiNO3-LiOH·H2O for the first time. The starting Na2.7MnTi3O9 sample was synthesized at 900 °C using conventional solid-state reaction. We determined the Na2.08Ti4O9-type tunnel structure of monoclinic Na2.7MnTi3O9 with the C2/m space group by powder X-ray Rietveld analysis. The cell parameters were determined to be a = 22.9995(8) Å, b = 2.9160(1) Å, c = 10.6319(4) Å, β = 102.544(2)°, and V = 696.02(4) Å3. We monitored the progress of ion-exchange reaction by the analytical results of ICP-AES. Rietveld analysis confirmed the ion-exchanged Li2.7MnTi3O9 sample maintained the original tunnel-type structure belonging to the same space group of C2/m. The cell parameters for Li2.7MnTi3O9 apparently decreased to be a = 21.1697(18) Å, b = 2.8926(1) Å, c = 10.6314(6) Å, β = 102.531(4)°, and V = 635.51(7) Å3, compared with those for Na2.7MnTi3O9. The electrochemical experiments of Li2.7MnTi3O9 revealed the lithium insertion/extraction reaction at ca. 3.0 V with high reversibility, which attributed to the Mn3+/Mn4+ redox reaction. The initial discharge capacity of 46 mAh g−1 corresponded to the inserted lithium content of 0.6 for chemical formula.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
