修饰石墨用作锂离子电池负极材料的研究

采用将高分子聚合物（例如酚醛树脂）包覆于石墨表面形成高分子碳化的方法，对石墨进行表面修饰处理，大大改善了石墨用作锂离子电池负极的性能。通过电化学测试发展，修饰石墨首次充放电效率达到９４．９％，比容量为３０６．１ｍＡｈ／ｇ，并且经过１００次循环后，比容量误差率公为８．２％。通过ＳＥＭ观察和ＸＲＤ衍射分析发现，石墨颗粒表面修饰对颗粒细化，提高锂离子嵌入活性点。防止溶剂分子共嵌入均有增强作用。

Study on Improved Graphite Anode for Lithium-Ion Battery

We modified graphite by covering the surface with high polymer (e. g. phenolic resin) to form a carbonized film. The modification of graphite surface greatly improved the performance of graphite anode for lithium- ion battery. Electrochemical tests showed that the first charge/discharge efficiency of improved graphite achieved 94. 9%,the specific capacity was 306. 1mAh/g,and decreasing rate of specific capacity was just 8. 3 % after 100 cycles. SEM and XRD results proved that the modification of graphite surface benefited reducing the particle size of graphite. provided more active sites of Li+ intercalation, and prevented the cointercalation of solvent molecule.