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−yGa_yA_xO (with A = Li, Na, K).