膨胀石墨作为锂离子电池负极材料的研究  

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

作　　者：刁玉琦[1] 宗军[1] 丁飞[1] 

机构地区：[1]中国电子科技集团公司第十八研究所,天津300384

出　　处：《电源技术》2017年第6期837-839,共3页Chinese Journal of Power Sources

摘　　要：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。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 m^2/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.

关 键 词：超低温 膨胀石墨 负极 锂离子电池 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]