论文部分内容阅读
Silicon nanowires(SiNWs) encapsulated with graphene-like carbon sheath(GS) having a void space in between(SiNW@V@GS) are demonstrated for the improved electrochemical performance of Si anode in lithium ion battery. The Si NW@V@GS structure was synthesized by a scalable fabrication method including four successive reactions: metal-catalyzed CVD growth of Si NWs, controlled thermal oxidation, and deposition of the graphitic layer, to form Si NW@SiO_2@GS and additional chemical etching of sacrificial SiO_2 layer between Si NWs and carbon sheath. During the synthetic process, the thickness of the void spacing was controlled by adjusting the oxidation-dependent process. The well-controlled void space and crystalline graphitic carbon sheath of the SiNW@V@GS structure enable good reversible capacity of1444 m Ahg~(-1) and cycling stability of 85% over 150 cycles.
Si nanowires (SiNWs) encapsulated with graphene-like carbon sheath (GS) having a void space in between (SiNW @ V @ GS) are demonstrated for the improved electrochemical performance of Si anode in lithium ion battery. structure was synthesized by a scalable fabrication method including four successive reactions: metal-catalyzed CVD growth of Si NWs, controlled thermal oxidation, and deposition of the graphitic layer, to form Si NW @ SiO_2 @ GS and additional chemical etching of sacrificial SiO_2 layer between Si NWs and carbon sheath. During the synthetic process, the thickness of the void spacing was controlled by adjusting the oxidation-dependent process. The well-controlled void space and crystalline graphitic carbon sheath of the SiNW @ V @ GS structure enable good reversible capacity of1444 m Ahg -1 and cycling stability of 85% over 150 cycles.