Method for preparing long-circulation lithium ion negative electrode material

• Main Authors: YANG YUNLIN, FANG ZIXING
• Format: Patent
• Language: Chinese; English
• Published: 05.05.2023
• 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 discloses a method for preparing a long-circulation lithium ion negative electrode material, and relates to the technical field of lithium battery negative electrode preparation, and the method comprises the following steps: pretreating a micro powder raw material to obtain shaped micro powder; mixing the reshaped micro powder with a binder, and preparing a blank C through a press machine; roasting the blank C at a high temperature, and performing high-pressure impregnation with an impregnant a to obtain an impregnated body D; carrying out secondary high-temperature roasting on the impregnated body D, and then carrying out high-pressure impregnation by using the impregnant b to obtain an impregnated body E; roasting the obtained impregnated body at high temperature, and crushing into a powder material F; performing high-temperature graphitization on the powder material F to obtain artificial graphite G; and demagnetizing the artificial graphite G, and screening to obtain the long-circulation lit