Lithium (De)Intercalation Capacity of Li_(1.93)Mn_(0.97)Ni_(0.10)O_(3-delta) Role of Oxygen Deficiency

摘要

Two compositional factors that control the lithium (de)intercalation capacity of nickel-doped Li_2MnO_3 have been identified. First is the Ni~(2+) content and (de)intercalation associated with the Ni~(2+/4+) redox-active couple. Second is the amount of oxygen deficiency achieved by preparing samples at different temperatures, together with creation of Mn~(3+) ions for charge balance and (de)intercalation associated with the Mn~(3+/4+) redox-active couple. Results demonstrating this effect are presented for composition Li_(1.93)Mn_(0.97)Ni_(0.10)O_(3-delta). The creation of an oxygen deficiency provides a novel method for enhancing the electrochemical performance of layered, rock-salt structured oxides.