Composite negative electrode material, preparation method thereof and lithium ion battery

• Main Authors: HE WEI, QIU MIN, ZHU ZHONGSI, GU LANBING, LI QIANWEI
• Format: Patent
• Language: Chinese; English
• Published: 02.10.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a composite negative electrode material, a preparation method thereof and a lithium ion battery. The composite negative electrode material comprises a one-dimensional carbon material, a two-dimensional carbon material and silicon oxide, the one-dimensional carbon material and the two-dimensional carbon material form a three-dimensional structure, the one-dimensional carbon material is inserted between layers of the two-dimensional carbon material, and the silicon oxide is located on the surfaces of the one-dimensional carbon material and the two-dimensional carbon material. The preparation method comprises the following steps of 1) mixing the silicon oxide, the one-dimensional carbon material and the two-dimensional carbon material, and then mixing with a solvent toobtain a mixed solution; 2) performing hydro-thermal treatment or solvothermal treatment on the mixed solution to obtain a gel; and 3) freeze-drying the gel to obtain the composite negative electrodematerial. The composite ne