Room temperature lithium superionic conductivity in high entropy oxides

Abstract

Impedance spectroscopy measurements evidence superionic Li+ mobility (>10-3 S cm-1) at room temperature and fast ionic mobility for Na+ (5 × 10-6 S cm-1) in high entropy oxides, a new family of oxide-based materials with the general formula (MgCoNiCuZn)1-x-yGayAxO (with A = Li, Na, K). Structural investigations indicate that the conduction path probably involves oxygen vacancies.