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摘要:
Graphene nanosheets (GNSs) were synthesized by reducing exfoliated graphite oxides. Their structure, surface morphology and lithium storage mechanism were characterized and investigated systematically using X-ray diffraction, atomic force microscopy, scanning electron microscopy, charge-discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy. It was found that the GNSs, which were obtained via chemical synthesis, were primarily less than 10 graphene layers. The GNS electrodes, which were fabricated from the reduced GNSs, exhibited an enhanced reversible lithium storage capacity and good cyclic stability when serving as anodes in lithium-ion batteries. Also, the first-cycle irreversible capacities of the system were relatively high, because of the formation of a solid electrolyte interphase film on the surface of the GNS electrode and the spontaneous stacking of GNSs during the first lithiation. The electrochemical impedance spectroscopy results suggest that the solid electrolyte interphase film on the GNS electrode during first lithiation were primarily formed at potentials between 0.95 and 0.7 V. Also, the symmetry factor of the charge transfer was measured to be 0.446.
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篇名 Mechanism of intercalation and deintercalation of lithium ions in graphene nanosheets
来源期刊 科学通报(英文版) 学科 地球科学
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年,卷(期) 2011,(30) 所属期刊栏目
研究方向 页码范围 3204-3212
页数 9页 分类号 P619.252
字数 语种 中文
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科学通报(英文版)
半月刊
1001-6538
11-1785/N
大16开
北京东黄城根北街16号
2-177
1950
eng
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9507
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