Speaker
Description
The lithium containing garnet oxides of Li7La3M2O12 (M = Ta, Nb) were reported to have Li+ conducting abilities back in 2003.1 Since then lithium containing garnet oxides have been identified as a electrolyte candidate for lithium ion batteries as they exhibit the physical and chemical properties desired for a solid-state electrolytes.2 The most notable garnet oxide material is the cubic phase (Ia-3d) Li6.4La3Zr1.4Ta0.6O12 which has a reported Li+ conductivity of 1 x 10-3 S cm-1.3 Here the structures and Li+ site occupancies of garnet series of Li7-xLa3Zr2-xTaxO12 (x = 0, 0.25, 0.50, 0.75 , 1.00) was further explored. A one step heating synthesis was employed for garnet preparing. Successful cubic phase garnet synthesis was confirmed with X-ray powder diffraction. Determination of lithium occupancy at the Li24 and Li96 sites was achieved with high-resolution neutron powder diffraction. NPD data were collected at room temperature, 200°C, 400°C and 600°C.
References
1. Thangadurai, V.; Kaack, H.; Weppner, W. J. F., Novel Fast Lithium Ion Conduction in Garnet-Type Li5La3M2O12 (M = Nb, Ta). Journal of the American Ceramic Society 2003, 86 (3), 437-440.
2. Thangadurai, V.; Narayanan, S.; Pinzaru, D., Garnet-type solid-state fast Li ion conductors for Li batteries: critical review. Chemical Society Reviews 2014, 43 (13), 4714-4727.
3. Li, Y.; Han, J.-T.; Wang, C.-A.; Xie, H.; Goodenough, J. B., Optimizing Li+ conductivity in a garnet framework. Journal of Materials Chemistry 2012, 22 (30), 15357-15361.
| Topic | Advanced Materials |
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