Negative electrode active material, rechargeable lithium battery containing the same, and preparation method of the same
AssigneeSamsung SDI Co., Ltd.
InventorsCHANGSU SHIN, SUNIL PARK
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Abstract
A negative electrode active material, a rechargeable lithium battery including the same, and a preparation method of the same are provided. The negative electrode active material includes an aggregated body in which two or more composites are aggregated, the composites each including silicon (Si) and carbon (C), and a coating layer around (e.g., surrounding) the aggregated body, wherein the composites each include a core containing crystalline silicon, a first shell containing a first amorphous carbon on the core, and a second shell containing amorphous silicon on the first shell, and wherein the coating layer contains a second amorphous carbon.
Claims20
A negative electrode active material comprising:
- an aggregated body in which two or more composites are aggregated, the composites each comprising silicon (Si) and carbon (C);
- and
- a coating layer around the aggregated body,
- wherein the composites each comprise:
- a core comprising crystalline silicon;
- a first shell comprising a first amorphous carbon on the core;
- and
- a second shell comprising amorphous silicon on the first shell, and
- wherein the coating layer comprises a second amorphous carbon.
A method comprising:
- spray drying a dispersion liquid comprising a first silicon precursor and a solvent to prepare a first particle;
- performing a first heat treatment on the first particle and a first carbon precursor at a temperature in a range of about 800° C. to about 1000° C. to prepare a second particle;
- performing a second heat treatment on the second particle and a second silicon precursor at a temperature in a range of about 450° C. to about 600° C. to prepare a third particle;
- and
- performing a third heat treatment on the third particle and a second carbon precursor at a temperature in a range of about 800° C. to about 1000° C.,
- wherein the method is a preparation method of a negative electrode active material.
Dependencies are inferred from the claim text.