High-performance rechargeable batteries having a spalled and textured cathode layer
First Claim
1. A method of forming a rechargeable battery stack, the method comprising:
- providing a cathode material substrate having a first textured surface and a non-textured surface opposite the first textured surface of the cathode material substrate;
forming a stressor layer on the first textured surface of the cathode material substrate, wherein the stressor layer has a textured bottom surface and a textured top surface; and
performing a spalling process to remove a spalled cathode material layer from the cathode material substrate, wherein the spalled cathode material layer is attached to the stressor layer and includes the first textured surface and a second textured surface that is opposite the first textured surface and wherein the spalling process comprises forming a crack in the cathode material substrate at a located between the first textured surface of the cathode material substrate and the non-textured surface of the cathode material substrate, and fracturing the cathode material substrate at the crack.
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Accused Products
Abstract
A high-capacity and a high-performance rechargeable battery is provided by forming a rechargeable battery stack that includes a spalled material structure that includes a spalled cathode material layer that has at least one textured surface and a stressor layer that has at least one textured surface. The stressor layer serves as a cathode current collector of the rechargeable battery stack. The at least one textured surface of the spalled cathode material layer forms a large interface area between the cathode and electrolyte which is formed above the spalled cathode material layer. The large interface area between the cathode and the electrolyte reduces interface resistance within the rechargeable battery stack.
39 Citations
21 Claims
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1. A method of forming a rechargeable battery stack, the method comprising:
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providing a cathode material substrate having a first textured surface and a non-textured surface opposite the first textured surface of the cathode material substrate; forming a stressor layer on the first textured surface of the cathode material substrate, wherein the stressor layer has a textured bottom surface and a textured top surface; and performing a spalling process to remove a spalled cathode material layer from the cathode material substrate, wherein the spalled cathode material layer is attached to the stressor layer and includes the first textured surface and a second textured surface that is opposite the first textured surface and wherein the spalling process comprises forming a crack in the cathode material substrate at a located between the first textured surface of the cathode material substrate and the non-textured surface of the cathode material substrate, and fracturing the cathode material substrate at the crack. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of forming a rechargeable battery stack, the method comprising:
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providing a stressor layer on a cathode material substrate, wherein the stressor layer and the cathode material substrate both having a non-textured bottom surface and a non-textured top surface that is opposite the non-textured bottom surface; texturing, after the providing the stressor layer on the cathode material substrate, the non-textured top surface of the stressor layer; and performing a spalling process to remove a spalled cathode material layer from the cathode material substrate, wherein the spalled cathode material layer has a textured surface and a non-textured surface that is opposite the textured surface, the non-textured surface of the spalled cathode material layer is attached to the non-textured bottom surface of the stressor layer and wherein the spalling process comprises forming a crack in the cathode material substrate at a located between the non-textured bottom surface of the cathode material substrate and the non-textured top surface of the cathode material substrate, and fracturing the cathode material substrate at the crack. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A rechargeable battery stack comprising:
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a cathode current collector that is composed of a metal stressor material and having a textured bottom surface and an entirely non-textured top surface that is opposite the textured bottom surface; a spalled cathode material layer having a top textured surface and and an entirely non-textured bottom surface opposite the top textured surface of the spalled cathode material layer, wherein the non-textured bottom surface of the spalled cathode material layer forms an interface with the non-textured top surface of the cathode current collector; an electrolyte located on the textured top surface of the spalled cathode material layer; an anode located on the electrolyte; and an anode current collector located on the anode. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification