Silicon-carbon negative electrode precursor material, silicon-carbon negative electrode material and preparation method thereof

• Main Authors: PENG QINGJIAO, YANG LEZHI, TANG WEIJIA, FENG QINGGE, QIN SHIBIAO, TU FEIYUE, TANG GANG, LUO LEI
• Format: Patent
• Language: Chinese; English
• Published: 11.09.2020
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a silicon-carbon negative electrode precursor material, a silicon-carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing nano silicon powder, graphite and a polymer to obtain a nano silicon-graphite composite material; pressurizing the nano silicon graphite composite material to obtain a compact nano silicon graphite composite block material; and carrying out carbonization treatment on the nano silicon-graphite composite block material in an inert atmosphere to obtain the silicon-carbonnegative electrode precursor material. According to the preparation method, the bonding strength and the dispersion uniformity of the silicon/graphite/amorphous carbon are ensured, the volume expansion effect of silicon in the charge-discharge process is greatly relieved, the prepared silicon-carbon negative electrode precursor material has the characteristics of high compaction density and uniform silicon-carbon distribu