关键词: 锂离子电池, 硅负极材料, 天然石墨, 循环性能, 退火处理

Abstract: One of the most important goals of the development of lithium ion battery is to get cathode materials with high capacity，and silicon materials with up to 4 200 mAh/g theoretical specific capacity have attracted researchers interest. However, the volume effects of silicon anode materials result in the rapid decline in the electrochemical cycling performance and limit its application in production. It researched Si and graphite doped through different proportions, with the method of highenergy ball milling and annealing. The results show that at the ratio of 2:1,the first specific discharge capacity can reach 2136.4 mAh/g. The capacity decays more slowly when silicon is doped with graphite, and 85.3% capacity is retained after 35 cycles. The silicon and graphite hybrid material presents a promising direction,and plays an important role in the production and application for anode materials for lithium ion batteries.

Key words: lithium battery, silicon anode materials, nature graphite, the cycle performance, annealing treatment