Effect of Al[sup 3+] and F[sup −] Doping on the Irreversible Oxygen Loss from Layered Li[Li[sub 0.17]Mn[sub 0.58]Ni[sub 0.25]]O[sub 2] Cathodes

The effect of the substitution of a small amount of or on the well-known irreversible loss of oxygen during the first charge from the layered , which is a solid solution between and , has been investigated. The oxygen loss from both and decreases sensitively with increasing Al or F content, which results in a drastic decrease in the reversible capacity in the subsequent cycles from for and for .