High-energy-density and high-power-density negative electrode material for lithium ion battery and preparation method

• Main Authors: PENG YANGCHENG, WANG ZHIYONG, CHEN SONG, LI YU, PI TAO, HUANG YUEHUA, LI NENG, YU MENGZE, SHAO HAOMING
• Format: Patent
• Language: Chinese; English
• Published: 14.05.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; NANOTECHNOLOGY; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING

The invention provides a high-energy-density and high-power-density negative electrode material for a lithium ion battery; the negative electrode material is of a kiwi fruit structure, wherein the kiwi fruit core is a soft carbon substrate, and kiwi fruit seeds are nano silicon materials uniformly dispersed on the surface of the soft carbon substrate; the fruit pulp of the kiwi fruit is carbon nano tubes uniformly dispersed on the surface of the soft carbon substrate and the surface of nano silicon; and the kiwi fruit outer skin is a conductive carbon coating layer. Meanwhile, the invention provides a preparation method of the negative electrode material. The composite negative electrode material prepared by the preparation method disclosed by the invention has a synergistic effect, and the problems of low-compaction density of soft carbon and the circulation expansion of silicon can be effectively overcome. 本发明提供了一种锂离子电池用高能量密度与高功率密度负极材料，所述负极材料为"猕猴桃"结构，所述"猕猴桃"芯为软碳基体，所述"猕猴桃"籽为均匀分散在软碳基体表面的纳米硅材料，所述"猕猴桃"果肉为均匀分散在软