Silicon-carbon composite negative electrode material, preparation method, negative electrode and lithium ion battery

• Main Authors: SHI JIAGUANG, YUAN FANGWEI, LI SHUO, LIU LANG, FAN XIECHENG, HU BAOPING
• Format: Patent
• Language: Chinese; English
• Published: 28.09.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a silicon-carbon composite negative electrode material. The material comprises silicon monoxide and nano silicon attached to the surface of the silicon monoxide, wherein the surface of the silicon monoxide attached with the nano silicon is coated with a nano carbon layer. The invention also discloses a preparation method of the silicon-carbon composite negative electrode material, and the method comprises the following steps: preparing nano silicon: taking a silicon raw material to prepare the nano silicon; enabling silicon monoxide to be attached to nanometer silicon: taking a silicon monoxide powder raw material, and enabling the nanometer silicon to be attached to the surfaces of particles of the silicon monoxide powder raw material; and performing coating: coating the surfaces of the silicon monoxide powder raw material particles attached with the nano silicon with nano carbon to form a nano carbon layer, and obtaining the silicon-carbon composite material. The invention also discl