Lithium (De)Intercalation Capacity of Li[sub 1.93]Mn[sub 0.97]Ni[sub 0.10]O[sub 3−δ]

Two compositional factors that control the lithium (de)intercalation capacity of nickel-doped have been identified. First is the content and (de)intercalation associated with the redox-active couple. Second is the amount of oxygen deficiency achieved by preparing samples at different temperatures, together with creation of ions for charge balance and (de)intercalation associated with the redox-active couple. Results demonstrating this effect are presented for composition . The creation of an oxygen deficiency provides a novel method for enhancing the electrochemical performance of layered, rock-salt structured oxides.