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膜的方法,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.通过电化学测试发现,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,比容量衰减率仅为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.
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