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US 10,854,908 B2Granted
Electrode structure and lithium battery including the same
AssigneeSamsung SDI Co., Ltd.
InventorsBo-Hyun Kim, Jong-Ki Lee, Hong-Jeong Kim, Yu-Jin Han
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Abstract
Provided are an electrode structure and a lithium battery including the same. The electrode structure may include a positive electrode, a negative electrode, and a first separator disposed between the positive electrode and the negative electrode, wherein the positive electrode and the negative electrode have active material layers having different loading levels. A lithium battery may have improved high rate characteristics and lifespan characteristics by including the electrode structure.
Claims19
An electrode structure for a lithium battery, the electrode structure comprising:
- a positive electrode;
- a negative electrode;
- and
- a first separator disposed between the positive electrode and the negative electrode,
- wherein the positive electrode comprises a positive electrode current collector;
- a first positive active material layer of the lithium battery disposed on a first surface of the positive electrode current collector;
- and a second positive active material layer of the lithium battery disposed on a second surface of the positive electrode current collector,
- wherein the negative electrode comprises a continuous negative electrode current collector;
- a first negative active material layer of the lithium battery disposed on a first surface of the negative electrode current collector;
- and a second negative active material layer of the lithium battery disposed on a second surface of the negative electrode current collector,
- wherein the first positive active material layer and the second positive active material layer comprise the same positive active material while having different loading levels, and wherein the first negative active material layer and the second negative active material layer comprise the same negative active material while having different loading levels,
- wherein a loading level of the second positive active material layer in the electrode structure is uniformly higher than a loading level of the first positive active material layer across the entire area of the first and second positive active material layers, a loading level of the first negative active material layer is uniformly higher than a loading level of the second negative active material layer across the entire area of the first and second negative active material layers,
- wherein a ratio of the loading level of the second positive active material layer to the loading level of the first positive active material layer is in a range of higher than 1 to about 4 or lower, and a ratio of the loading level of the first negative active material layer to the loading level of the second negative active material layer is in a range of higher than 1 to about 4 or lower,
- wherein the second positive active material layer having the loading level that is higher than the loading level of the first positive active material layer faces the first negative active material layer having the loading level that is higher than the loading level of the second negative active material layer, and
- wherein the second positive active material layer and the first negative active material layer are disposed near the first separator located therebetween such that only the first separator is located between the second positive active material layer and the first negative active material layer.
12 more elements
An electrode structure for a lithium battery, the electrode structure comprising:
- a positive electrode;
- a negative electrode;
- and
- a first separator disposed between the positive electrode and the negative electrode,
- wherein the positive electrode comprises a positive electrode current collector;
- a first positive active material layer of the lithium battery disposed on a first surface of the positive electrode current collector;
- and a second positive active material layer of the lithium battery disposed on a second surface of the positive electrode current collector,
- wherein the negative electrode comprises a continuous negative electrode current collector;
- a first negative active material layer of the lithium battery disposed on a first surface of the negative electrode current collector;
- and a second negative active material layer of the lithium battery disposed on a second surface of the negative electrode current collector,
- wherein the first positive active material layer and the second positive active material layer comprise the same positive active material while having different loading levels, and wherein the first negative active material layer and the second negative active material layer comprise the same negative active material while having different loading levels,
- wherein a loading level of the second positive active material layer in the electrode structure is uniformly higher than a loading level of the first positive active material layer across the entire area of the first and second positive active material layers, a loading level of the first negative active material layer is uniformly higher than a loading level of the second negative active material layer across the entire area of the first and second negative active material layers,
- wherein a ratio of the loading level of the second positive active material layer to the loading level of the first positive active material layer is in a range of higher than 1 to about 4 or lower, and a ratio of the loading level of the first negative active material layer to the loading level of the second negative active material layer is in a range of higher than 1 to about 4 or lower,
- the second positive active material layer and the first negative active material layer are disposed near the first separator located therebetween such that only the first separator is located between the second positive active material layer and the first negative active material layer, and
- wherein a porosity of the second positive active material layer and a porosity of the first positive active material layer are different from each other, and a porosity of the first negative active material layer and a porosity of the second negative active material layer are different from each other.
12 more elements
Dependencies are inferred from the claim text.