Understanding the Positive Effect of LATP in Polymer Electrolytes in All-Solid-State Lithium Batteries
Journal
Journal of the Electrochemical Society
Journal Volume
170
Journal Issue
9
Date Issued
2023-01-01
Author(s)
Breuer, Ortal
Peta, Gayathri
Elias, Yuval
Alon-Yehezkel, Hadas
Weng, Yu Ting
Fayena-Greenstein, Miryam
Levi, Mikhael D.
Aurbach, Doron
Abstract
Composite solid electrolytes with ceramic particles dispersed in a polymer matrix are considered a correct choice for all-solid-state batteries. These electrolytes balance the high ionic conductivity of superionic-ceramic conductors and the elasticity of polymers. Here, Li||LiFePO4 batteries with 30 wt% of LATP embedded in PEO20:LiTFSI show superior performance at elevated temperature. After ∼150 cycles, cells retained 84% of their original capacity compared to only 51% for batteries with no additive. At 5 C cells demonstrate 43% higher capacity. In symmetric cells with blocking and non-blocking electrodes and all-solid-state batteries LATP lowers the impedance of the electrode-electrolyte interface ensuring cycling stability. LATP improves performance by stabilization of the cathode-electrolyte interface, apparently the major contributor to the cell impedance.
SDGs
Type
journal article