Manganese oxide compounds
AssigneeTechnology Finance Corporation (Proprietary) Limited
InventorsMargaretha H. Rossouw, Michael M. Thackeray
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Abstract
The invention provides a hydrogen manganese oxide compound. It has manganese cations and oxygen anions arranged in a framework having a hollandite-type structure and defining channels. Cations in the channels are confined to manganse, hydrogen and/or lithium cations. The ionic ratios of lithium:manganese cations and of hydrogen:manganese cations are respectively at most 0.05:1 and at least 0.01:1.00. The invention also provides a method of making said compound; a lithium manganese oxide compound derived from said hydrogen manganese oxide compound and a method of synthesising it therefrom; and electrochemical cells employing said hydrogen manganese oxide and lithium manganese oxide compounds as active cathode materials.
Claims16
A hydrogen manganese oxide compound in which there are manganese cations and oxygen anions arranged in a framework having a hollandite structure defining channels, the only metal cations in the channels other than manganese cations being lithium cations, the ionic ratio of lithium cations:manganese cations being at most 0.05:1.00, and the ionic ratio of hydrogen cations:manganese cations being at least 0.01:1.00.
A lithium manganese compound of formula H.sub.2x-z Li.sub.z MnO.sub.2+x in which 0.005<x.ltoreq.0.3 and 0<z.ltoreq.2x, having manganese cations and oxygen anions arranged in a stable hollandite structure having channels containing no cations other than lithium cations, hydrogen cations and manganese cations.
Dependencies are inferred from the claim text.