Si@C core/shell Nanomaterials for High Performance Anode of Lithium Ion Batteries
First Claim
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1. A method for fabricating a silicon core/carbon shell material, comprising:
- providing silicon particles;
providing a structure directing agent comprising alcoholic solvent and water;
mixing the silicon particles with the structure directing agent and a carbon source to form a reaction mixture, wherein the silicon particles are dispersed in the alcoholic solvent to form silicon particle aggregation droplets;
heating the reaction mixture by a hydrothermal process to form one or more silicon cores and one or more carbon shells, wherein each of the silicon cores comprises a plurality of silicon clusters formed from the silicon particle aggregation droplets, and is enclosed by the carbon shell; and
calcinating the silicon cores enclosed by the carbon shell by a calcination process for further carbonizing the carbon shells.
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Abstract
The present invention is to tackle the volume expansion problem of the Si anode materials in the application of lithium ion batteries. In the present invention, a simple and green hydrothermal method is use to form loosely packed Si@C core/shell structure. A carbon coating layer is formed on controllably aggregated silicon nanoparticles in a one-step procedure by the hydrothermal carbonization of a carbon-rich precursor.
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14 Claims
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1. A method for fabricating a silicon core/carbon shell material, comprising:
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providing silicon particles; providing a structure directing agent comprising alcoholic solvent and water; mixing the silicon particles with the structure directing agent and a carbon source to form a reaction mixture, wherein the silicon particles are dispersed in the alcoholic solvent to form silicon particle aggregation droplets; heating the reaction mixture by a hydrothermal process to form one or more silicon cores and one or more carbon shells, wherein each of the silicon cores comprises a plurality of silicon clusters formed from the silicon particle aggregation droplets, and is enclosed by the carbon shell; and calcinating the silicon cores enclosed by the carbon shell by a calcination process for further carbonizing the carbon shells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A silicon core/carbon shell structure, comprising:
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a silicon core comprising a plurality of silicon clusters; a carbon shell; and a plurality of gaps; wherein each of the silicon clusters is aggregated by a plurality of silicon particles; wherein the carbon shell encloses the silicon core and is chemically bonded to the silicon core; and wherein the gaps are present among the silicon clusters, and between the silicon core and the carbon shell. - View Dependent Claims (12, 13, 14)
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Specification