Silicon-carbon composite material and preparation method thereof

• Main Authors: YANG LEZHI, LIU YUNFENG, TANG WEIJIA, FENG QINGGE, CHEN TAO, QIN SHIBIAO, TU FEIYUE
• Format: Patent
• Language: Chinese; English
• Published: 13.05.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A preparation method of a silicon-carbon composite material comprises the following steps: (1) dissolving tetraethoxysilane, hexadecyl trimethyl ammonium bromide, a catalyst and transition metal ions in an alcoholic solution, and stirring to obtain a solution A; (2) preparing an alcohol-water mixed solution B; (3) adding the solution A into the solution B, stirring to obtain an emulsion C, standing and centrifuging to obtain a solid, cleaning, drying, and calcining at high temperature to obtain powder D; and (4) reducing the powder D at high temperature, cooling and washing, and coating carbon by vapor deposition to obtain the silicon-carbon composite material. The silicon-carbon composite material takes a silicon-carbon material as a matrix, a silicon material and a carbon material in the matrix are uniformly distributed, transition metal ions are doped in the matrix material, and a carbon coating layer is coated outside the matrix. A liquid silicon source and a liquid carbon source are fully mixed and then