Negative electrode active material for secondary battery and method for manufacturing same
First Claim
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1. A method of fabricating a silicon-based active material, the method comprising:
- providing silicon particles; and
oxidizing the silicon particles to form a silicon-based active material comprising particles with a silicon core and a shell of silicon oxide surrounding the core,wherein the shell of silicon oxide is obtained by oxidizing at least a part of the silicon particles,wherein an amount of oxygen with respect to a total weight of the silicon core and the shell of silicon oxide is restricted to 9 wt % to 20 wt %,wherein the oxidizing of the silicon particles is performed by chemically oxidizing the silicon particles in a liquid solvent comprising oxygen,wherein the silicon particles are miniaturized through a grinding process or a pulverizing process performed on a slurry comprising the silicon particles and the liquid solvent comprising oxygen,wherein the chemically oxidizing of silicon particles is induced by at least one of compressive stress and shearing stress induced from the grinding process or the pulverizing process at a same time as the silicon particles are miniaturized.
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Abstract
Provided is an anode active material for a secondary battery and a method of fabricating the anode active material. A silicon-based active material composite according to an embodiment of the inventive concept includes silicon and silicon oxide obtained by oxidizing at least a part of the silicon, and an amount of oxygen with respect to a total weight of the silicon and the silicon oxide is restricted to 9 wt % to 20 wt %.
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13 Claims
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1. A method of fabricating a silicon-based active material, the method comprising:
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providing silicon particles; and oxidizing the silicon particles to form a silicon-based active material comprising particles with a silicon core and a shell of silicon oxide surrounding the core, wherein the shell of silicon oxide is obtained by oxidizing at least a part of the silicon particles, wherein an amount of oxygen with respect to a total weight of the silicon core and the shell of silicon oxide is restricted to 9 wt % to 20 wt %, wherein the oxidizing of the silicon particles is performed by chemically oxidizing the silicon particles in a liquid solvent comprising oxygen, wherein the silicon particles are miniaturized through a grinding process or a pulverizing process performed on a slurry comprising the silicon particles and the liquid solvent comprising oxygen, wherein the chemically oxidizing of silicon particles is induced by at least one of compressive stress and shearing stress induced from the grinding process or the pulverizing process at a same time as the silicon particles are miniaturized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification