Carbon coated Ag-nanowires@SnO2 core-shell heterogeneous structures as anode material for lithium ion batteries
作者单位：College of Chemistry Chemical Engineering and Materials Science Soochow University
会议名称：《2015年第十四届全国应用化学年会》
会议日期：2015年
学科分类：0808[工学-电气工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
关 键 词：Tin dioxide Ag nanowires Carbon Nanocomposite Lithium-ion batteries Electrochemistry
摘 要：In order to obtain cleaner and more efficient new energy resources, Develepment in Lithium ion capacitors have recently drawn considerable attention. Carbon coated Ag-nanowires@SnO coreshell heterogeneous structures have been successfully synthesized through a two-step method. First, Ag-nanowires@SnO were gained via simple hydrothermal method. Second, Carbon layer was wrapped on the Ag-nanowires@SnO by a subsequent calcinations at 600 oC in a high-purity nitrogen atmosphere, in which the dopamine was selected as carbon source. The as-prepared samples were characterized with transmission electron microscopy(TEM), field-emission scanning electron microscopy(FE-SEM), X-ray diffraction(XRD), energydispersive spectroscopy(EDS), X-ray photoelectron Spectroscopy(XPS). In the charge-discharge test, the Carbon coated Ag-nanowires@SnO core-shell heterogeneous structures exhibited the outstanding performance, with an initial discharge specific capacity of 908 m Ah/g on the voltage range from 0.01 to 2.4 V. After 60 cycles, the high reversible capcacities of about 530 m Ah/g still be retained at a rate of 0.1 C. This improved Lithium storage performance could be mainly attributed to the Ag nanowires and carbon layer. On the account of Ag-nanowires nice electrical conductivity, the disadvantage of conductivity of SnO-based materials be overcome. And the carbon layer reduces the volume change of SnO-based materials. Hence, Carbon coated Ag-nanowires@SnO core-shell heterogeneous structures are promising anodes for lithium ion batteries.