High voltage structural evolution and enhanced Na-ion diffusion in P2-Na2/3Ni1/3−xMgxMn2/3O2 (0 ≤ x ≤ 0.2) cathodes from diffraction, electrochemical and ab initio studies

A detailed investigation on the effects of Mg substitution (0 ≤ x ≤ 0.2) in high voltage P2-Na_2/3Ni_1/3−xMg_xMn_2/3O₂ cathode materials for Na-ion batteries.