ИСТИНА

All-Solid-State Batteries (ASSBs) are the important elements of the nearest future electrochemical energy technologies. One of the key elements of ASSBs are the solid electrolyte materials. Among all practicable benefits relative to conventional organic electrolytes that are used in lithium ion batteries (LIBs) one can pinpoint their safety, high energy density characteristics, openings for device miniaturization and handling properties while they exhibit very close kinetic characteristics. Garnet structured solid electrolytes can be seen as one of the most viable candidate material due to its chemical stability with Li metal anode, reasonable kinetic properties (σLi>10-4) with transference number close to unit (σLi /σtotal ≈ 1) and wide electrochemical window [1, 2]. This study is focused on the analysis of the parameters affecting ionic conductivity in garnet LLZO/LLTO thin films. While studies of mechanisms responsible for ionic conductivity in bulk attracts high attention there is surprisingly only limited number of studies on garnet films that have been published. In this study, the information on the parameters responsible for strain effects, defects and secondary phase formation (composition, method of deposition, elastic properties of substrate materials, thermal expansion characteristics, temperature processing and lattice mismatch) for the available published data have been used in our analysis and related with ionic transport characteristics. The relative contribution of considered parameters to ionic diffusion in garnet films have been unveiled, given observations were discussed and reinforced by additional literature analysis. The results obtained can be used to accelerate screening of new materials for Li ion ASSBs.