Negative active material and preparation method thereof

• Main Authors: WEI LIANGQIN, WU YUHU, MA FEI, LI FENGFENG
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a negative electrode active material and a preparation method thereof, the negative electrode active material comprises a porous base core, the porous base core comprises a base material and a boron-containing substance dispersed in the base material, the base material comprises a silicon simple substance and MSiO3, and M represents a metal element; the pore channels of the porous base core are also filled with a silicon compound, and the pore channels are not filled with the silicon compound. According to the negative electrode active material and the preparation method thereof in the technical scheme of the invention, the negative electrode active material has very good material stability while guaranteeing relatively high gram volume and first effect, a lithium ion battery prepared by taking the negative electrode active material as a negative electrode has excellent fast charge and cycle characteristics, and meanwhile, the expansion of the battery in the cycle process can be reduced