膨胀石墨作为锂离子电池负极材料的研究

报道了以超低温膨胀石墨作为锂离子电池负极材料的研究。采用X射线衍射分析(XRD)、扫描电子显微镜(SEM)以及氮气吸脱附测试(BET)对其物相、表面形貌及结构进行表征;利用恒电流充/放电对其电化学性能进行了测试。结果表明:超低温膨胀石墨呈现出蜂窝状多孔结构,比表面积为54 m~2/g。该材料表现出较好的脱/嵌锂容量和良好的循环性能,在100 m A/g的电流密度下,首次可逆比容量达到410 m Ah/g;循环220次后,比容量仍能维持在400 m Ah/g,容量保持率高于95%,是一种具有很好应用前景的储锂负极材料。

Research on expanded graphite as anode material for lithium-ion battery

A super-low temperature method for synthesizing expanded graphite as anode material for lithium-ion battery was reported.The phase,morphology and structure of the expanded graphite were characterized by X-ray diffraction (XRD),scanning electron microscope (SEM) and Brunauer-Emmett-Teller (BET) measurements;the electrochemical performance was tested by the galvanostatic charge/discharge process.The results show that the acquired graphite with comb-like porosity structure has specific area of 54 m2/g.The expanded graphite has good performance for lithium-ion insertion/extraction.At the current density of 100 mA/g,the initial specific capacity can reach 410 mAh/g,and the capacity (about 400 mAh/g) retention is up to 95％ after 220 cycles.It is a promising anode material for lithium-ion battery.