Promoting the fast Na-storage and stable layered cathode for sodium‐ion batteries by a site-selective substitution in triple crystallographic sites

An advanced Na 0.66 Ca 0.05 [Ni 0.25 Li 0.11 Mn 0.64 ]O 1.95 F 0.05 with fast Na storage and long-life was designed via a site-selective substitution of Ca 2+ , Li + and F − , and investigated by a series of physical/electrochemical tests and theoretical calculation.