Rechargeable spinel lithium batteries with greatly improved elevated temperature cycle life
First Claim
1. A non-aqueous rechargeable lithium manganese oxide battery having reduced capacity fade rate during cycling at elevated temperature, said battery comprising:
- a lithium manganese oxide spinel structure compound cathode, a lithium insertion compound anode, a separator, and a non-aqueous electrolyte including a lithium salt dissolved in a non-aqueous solvent, wherein;
the spinel structure compound is coated with the decomposition products of one or more compounds of foreign metals with atomic number greater than 11 that reduce the capacity fade rate of the battery during cycling at elevated temperature, wherein said decomposition products are formed by heating a mixture of said spinel structure compound and said foreign metal compounds at a temperature at which said foreign metal compounds decompose to coat the surface of said spinel structure compound without entering the bulk of the spinel structure or extracting lithium therefrom.
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Accused Products
Abstract
The loss in delivered capacity (capacity fade) after cycling non-aqueous rechargeable lithium manganese oxide batteries at elevated temperatures can be greatly reduced by depositing a small amount of certain foreign metal species on the surface of spinel in the cathode. In particular the foreign metal species are from compounds having either bismuth, lead, lanthanum, barium, zirconium, yttrium, strontium, zinc or magnesium. The foreign metal species are introduced to the surface of spinel by moderately heating either an aqueous treated mixture or a dry mixture of ready-made spinel and the foreign metal compound.
71 Citations
32 Claims
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1. A non-aqueous rechargeable lithium manganese oxide battery having reduced capacity fade rate during cycling at elevated temperature, said battery comprising:
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a lithium manganese oxide spinel structure compound cathode, a lithium insertion compound anode, a separator, and a non-aqueous electrolyte including a lithium salt dissolved in a non-aqueous solvent, wherein;
the spinel structure compound is coated with the decomposition products of one or more compounds of foreign metals with atomic number greater than 11 that reduce the capacity fade rate of the battery during cycling at elevated temperature, wherein said decomposition products are formed by heating a mixture of said spinel structure compound and said foreign metal compounds at a temperature at which said foreign metal compounds decompose to coat the surface of said spinel structure compound without entering the bulk of the spinel structure or extracting lithium therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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- 17. A method for reducing the capacity fade rate during cycling at elevated temperature of a non-aqueous rechargeable lithium manganese oxide battery, the battery comprising a lithium manganese oxide spinel structure compound cathode, a lithium insertion compound anode, a separator, and a non-aqueous electrolyte including a lithium salt dissolved in a non-aqueous solvent, wherein the spinel structure compound is formed by heating a mixture of said spinel structure compound and one or more compounds of foreign metals with atomic number greater than 11 at a temperature at which said foreign metal compounds decompose to coat the surface of said spinel structure compound with decomposition products without entering said compound structure, wherein said foreign metal compounds form decomposition product coatings that reduce the capacity fade rate of the battery during cycling at elevated temperature.
Specification