Room temperature lithium superionic conductivity in high entropy oxides

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−y Ga y A x O (with A = Li, Na, K).