Mixed lithium manganese oxide and lithium nickel cobalt oxide positive electrodes
First Claim
1. A lithium insertion positive electrode comprising a mixture of two or more homogeneous lithium ion insertion materials,wherein at least one of the homogeneous lithium ion insertion materials is a chemical compound of the formula LixNi0.8Co0.2O2 having an α
- -NaCrO2 crystal structure, where x is between about 0 and about 1 and can be varied within this range by electrochemical insertion and extraction, and wherein at least one of the homogeneous lithium ion insertion materials is a lithium manganese oxide chemical compound of the formula LixMn2O4, and wherein the LixNi0.8Co0.2O2 is present in the positive electrode at a concentration of between about 30 and 80 weight percent and the LixMn2O4 is present in the positive electrode at a concentration of between about 20 and 70 weight percent.
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Abstract
Positive electrodes including a lithium nickel cobalt metal oxide are disclosed. The lithium nickel cobalt metal oxides have the general formula LixNiyCOzMnO2, where M is selected from the group consisting of aluminum, titanium, tungsten, chromium, molybdenum, magnesium, tantalum, silicon, and combinations thereof, x is between about 0 and about 1 and can be varied within this range by electrochemical insertion and extraction, the sum of y+z+n is about 1, n ranges between above 0 to about 0.25, y and z are both greater than 0, and the ratio z/y ranges from above 0 to about 1/3. Also disclosed are composite positive electrodes including the above-described lithium nickel cobalt metal oxides together with a lithium manganese metal oxide of the formula LixMn2−rM1rO4, where r is a value between 0 and 1 and M1 is chromium, titanium, tungsten, nickel, cobalt, iron, tin, zinc, zirconium, silicon, or a combination thereof.
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Citations
21 Claims
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1. A lithium insertion positive electrode comprising a mixture of two or more homogeneous lithium ion insertion materials,
wherein at least one of the homogeneous lithium ion insertion materials is a chemical compound of the formula LixNi0.8Co0.2O2 having an α - -NaCrO2 crystal structure, where x is between about 0 and about 1 and can be varied within this range by electrochemical insertion and extraction, and
wherein at least one of the homogeneous lithium ion insertion materials is a lithium manganese oxide chemical compound of the formula LixMn2O4, and wherein the LixNi0.8Co0.2O2 is present in the positive electrode at a concentration of between about 30 and 80 weight percent and the LixMn2O4 is present in the positive electrode at a concentration of between about 20 and 70 weight percent. - View Dependent Claims (2, 3, 4, 5, 6)
- -NaCrO2 crystal structure, where x is between about 0 and about 1 and can be varied within this range by electrochemical insertion and extraction, and
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7. A lithium ion cell comprising:
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(a) a cell container;
(b) a negative electrode provided within the cell container and capable of intercalating lithium during charge and deintercalating lithium during discharge;
(c) an electrolyte conductive to lithium ions and provided within said cell container; and
(d) a positive electrode provided within the cell container and capable of taking up lithium on discharge and releasing lithium on charge, the positive electrode including a mixture of (i) a chemical compound of the formula LixNi0.8Co0.2O2 having an α
-NaCrO2 crystal structure, where x is between about 0 and about 1 and can be varied within this range by electrochemical insertion and extraction, and(ii) a lithium manganese oxide chemical compound of the formula LixMn2O4, and wherein the LixNi0.8Co0.2O2 is present in the positive electrode at a concentration of between about 30 and 80 weight percent and the LixMn2O4 is present in the positive electrode at a concentration of between about 20 and 70 weight percent. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A lithium insertion positive electrode comprising a mixture of two or more homogeneous lithium ion insertion materials,
wherein at least one of the homogeneous lithium ion insertion materials is LixNi0.8Co0.2O2 having an α - -NaCrO2 crystal structure, where x is between about 0 and about 1 and can be varied within this range by electrochemical insertion and extraction, and
wherein at least one of the homogeneous lithium ion insertion materials is a lithium manganese oxide spinel, and wherein the LixNi0.8Co0.2O2 is present in the positive electrode at a concentration of between about 30 and 80 weight percent and the lithium manganese oxide is present in the positive electrode at a concentration of between about 20 and 70 weight percent. - View Dependent Claims (18, 19, 20, 21)
- -NaCrO2 crystal structure, where x is between about 0 and about 1 and can be varied within this range by electrochemical insertion and extraction, and
Specification