A shortcut to garnet-type fast Li-ion conductors for all-solid state batteries
By Afyon, Semih; Kr
Published in J. Mater. Chem. A
The Royal Society of Chemistry
2015
Abstract
Ga-doped Li?La?Zr?O?? garnet structures are among the most promising electrolytes for all-solid state Li-ion-batteries. The synthesis and processing of garnet-type fast Li-ion conductors depend on conventional sol-gel and solid state syntheses and sintering that are usually done at temperatures above 1050 [degree]C to reach the high Li-ion conducting cubic phase. This process results in micron-sized particles and potential Li-loss, which are unfavorable for further processing and electrode-electrolyte assembly. Here, we tackle this problem and report a novel low temperature synthesis-processing route to stabilize the cubic phase of Li?La?Zr?O??, while keeping the nanocrystallites at [similar]200-300 nm. Li?La?Zr?O?? phases are obtained at temperatures as low as 600 [degree]C by a modified sol-gel combustion method utilizing mainly nitrate precursors, and the sintering temperature is lowered by [similar]200 [degree]C compared to the state-of-art. Through a new model experiment, we also shed light on the conditions influencing the tetragonal to cubic phase transformation via homogeneous Ga-diffusion and incorporation occurring at a surprisingly low temperature of [similar]100 [degree]C for a post-annealing step. The sintered pellets of the newly obtained Li6.4Ga0.2La?Zr?O?? deliver high bulk Li-ion conductivities in the range of [similar]4.0 [times] 10-4 S cm-1 at 20 [degree]C, and a wide thermal operation window is accessible through its characteristic activation energy of [similar]0.32 eV. We report that there is an optim
Microsoft is Ending Support for Windows 7
Microsoft will discontinue support for Windows 7 on January 14, 2020 which means Gamry will also be discontinuing support for Windows 7. If you are upgrading to Windows 10, like many companies and institutions, you need to be running Version 7 of our s oftware . Please note that only USB and Ethernet-based instruments can run in Version 7. Eligible users can download the latest version of our software through our online Client Portal .
If you haven't already registered your instrument, you can do so through the Client Portal .
Please email Technical Support if you have any questions regarding this transition. Please be sure to include your instrument model and serial number when contacting us.