Negative electrode material, secondary battery, and electronic device

• Main Author: HU RONGTAO
• Format: Patent
• Language: Chinese; English
• Published: 25.04.2023
• 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 material, a secondary battery and an electronic device. The negative electrode material comprises silicon-carbon composite particles, the silicon-carbon composite particles comprise a porous silicon substrate, the button cell with lithium as a negative electrode and the negative electrode material as a positive electrode is used for charging and discharging tests, a charging curve of the button cell has a first voltage platform and a second voltage platform, the first voltage platform ranges from 0 V to 0.02 V, and the second voltage platform ranges from 0 V to 0.02 V. The range of the second voltage platform is from 0.40 V to 0.45 V. The two-stage lithium storage behavior of the negative electrode material can effectively improve the cycle performance and storage performance of the secondary battery comprising the negative electrode material. 本申请提供了一种负极材料、二次电池和电子装置。本申请的负极材料包括硅碳复合颗粒，该硅碳复合颗粒包括多孔硅基体，其中，使用以锂作为负极、以该负极材料作为正极的扣式电池进行充放电测试，扣式电池的充电曲线存在第一电压平台和第二电压平台，第一电压平台的范围