石墨烯
拉曼光谱
化学气相沉积
X射线光电子能谱
材料科学
锂(药物)
扫描电子显微镜
电极
电化学
分析化学(期刊)
化学工程
纳米技术
化学
复合材料
光学
医学
物理
工程类
内分泌学
物理化学
色谱法
作者
Mathieu Saulnier,Charles Trudeau,Sylvain G. Cloutier,Steen B. Schougaard
标识
DOI:10.1016/j.electacta.2017.04.101
摘要
Multilayered graphene (MLG) grown by chemical vapor deposition (CVD) was examined as a negative electrode for lithium-ion batteries. Experimental parameters such as deposition time and temperature were examined to produce carbon loadings between 0.06–0.17 mg cm−2 and film thicknesses in the 1 μm range. The MLG thin films obtained on nickel substrate were used without conductive additive and binding agent in electrochemical tests to produce a capacity of ∼250 mAh.g−1 at the 5C rate. Films were further characterized by scanning electron microscopy, atomic force microscopy, grazing angle X-ray diffraction, X-ray photoelectron spectroscopy and Raman micro-spectroscopy mapping. By correlating the structural analysis to the electrochemical properties the importance of edge plane accessibility is emphasized. Separately, a pre and a post deposition treatment were used to improve the electrochemical performances, validating the structural performance limitation hypothesis. In particular, the use of argon plasma post treatment yielded major improvement of the electrochemical performance, which was ascribed to enhanced crystallite edge accessibility.
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