Solid-state materials that are capable of lithium-ion conductivity are important to the development of all-solid-state batteries. We have demonstrated the lithium-ion mobility in several series of layered oxides, and have shown that it can be significantly enhanced by variation of symmetry. The structural distortions and the change in symmetry lead to the formation of a supercell in these layered systems, which is associated with the improvement of lithium-ion conductivity. Detailed analyses of real and imaginary components of electrochemical impedance spectroscopy data, as well as dielectric properties, tangent loss, and complex modulus show the systematic increase in lithium-ion mobility. The dielectric properties follow the same trend as lithium-ion conductivity, where the more conductive materials show greater magnitude of dielectric constant. While the lithium-ion conductivity of these materials is still lower than that needed for practical applications, these fundamental studies demonstrate the impact of structural modifications and supercell formation on lithium-ion mobility in solid networks.

Lithium-ion mobility in layered oxides enhanced by supercell formation

ACS Spring 2022

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