Silicon-carbon composite negative electrode material and preparation method and application thereof

• Main Authors: CHEN MAOSONG, ZHANG ZENGLONG, LAI HONGZHENG
• Format: Patent
• Language: Chinese; English
• Published: 13.06.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; NANOTECHNOLOGY; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING

The invention provides a preparation method of a silicon-carbon composite negative electrode material, which comprises the following steps: in a protective environment, carrying out nanocrystallization on a silicon material to obtain nano silicon; the preparation method comprises the following steps: carrying out self-assembly on nano silicon, a first carbon source and a high-molecular polymer, and then adding a second carbon source for self-assembly to obtain layered nano silicon; the preparation method comprises the following steps: granulating layered nano silicon to obtain a precursor; and sintering the precursor at the sintering temperature of 800-1200 DEG C to obtain the silicon-carbon composite negative electrode material. The invention further provides the silicon-carbon composite negative electrode material and a battery comprising the silicon-carbon composite negative electrode material. The preparation method disclosed by the invention is simple in process, easy in flow control and suitable for ind