Loose-fit graphitic encapsulation of silicon nanowire for one-dimensional Si anode design. Issue 10 (October 2017)

• Record Type: Journal Article
• Authors: Lim, Seh-Yoon; Chae, Sudong; Jung, Su-Ho; Hyeon, Yuhwan; Jang, Wonseok; Yoon, Won-Sub; Choi, Jae-Young; Whang, Dongmok
• Is Part Of: Journal of materials science & technology. Volume 33:Issue 10(2017:Oct.)
• Page Start: 1120
• Page End: 1127
• Publication Date: 2017-10
• Subjects: Lithium ion battery -- Silicon nanowire -- Graphene -- Void spacing -- Anode; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2017.07.003
• Languages: English
• ISSNs: 1005-0302

Abstract

Graphical abstract: Abstract: 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 SiNW@V@GS structure was synthesized by a scalable fabrication method including four successive reactions: metal-catalyzed CVD growth of SiNWs, controlled thermal oxidation, and deposition of the graphitic layer, to form SiNW@SiO2 @GS and additional chemical etching of sacrificial SiO2 layer between SiNWs 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 of 1444 mAh g −1 and cycling stability of 85% over 150 cycles.