Facilitating reversible transition metal migration and expediting ion diffusivity <i>via</i> oxygen vacancies for high performance O3-type sodium layered oxide cathodes

Abstract

The in situ introduced oxygen vacancies deliver dual functionality for realizing the high-voltage operation of NaCrO 2– x (charged up to 3.8 V) by facilitating reversible TM migration and improving the rate capability by expediting ion diffusivity.