Lithium manganese oxides and batteries
AssigneeNanoGram Corporation
InventorsCraig R. Horne, Sujeet Kumar, Hariklia Dris Reitz, James T. Gardner, Xiangxin Bi
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Abstract
Lithium manganese oxide particles have been produced with an average diameter less than about 250 nm. The particles have a high degree of uniformity. The particles are formed by the heat treatment of nanoparticles of manganese oxide. The lithium manganese oxide particles are useful as active materials in the positive electrodes of lithium based batteries. Improved batteries result from the use of the uniform nanoscale lithium manganese oxide particles.
Claims22
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter less than about 250 nm, wherein the collection of particles have a distribution of particle sizes in which at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
A method of making lithium manganese oxide particles comprising heating a mixture of manganese monoxide (MnO) particles and a lithium compound, the manganese monoxide particles having an average diameter less than about 250 nm.
A method of making lithium manganese oxide particles comprising heating a mixture of particles of a manganese oxide and a lithium compound, the particles of manganese oxide having an average diameter less than about 250 nm, wherein the resulting lithium manganese oxide particles have a distribution of particle sizes in which at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter from about 5 nm to about 50 nm, the lithium manganese oxide comprising Li.sub.2 Mn.sub.4 O.sub.9.
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter less than about 250 nm, the lithium manganese oxide having a lattice parameter along axis a of no more than 8.23 angstroms.
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter less than about 250 nm, the lithium manganese oxide comprising Li.sub.2 Mn.sub.4 O.sub.9, wherein the collection of particles have a distribution of particle sizes such that at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
Dependencies are inferred from the claim text.