Synthesis of CuxS/Cu Nanotubes and Their Lithium Storage Properties

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• 作者：Ren Cai ; Jing Chen ; Jixin Zhu ; Chen Xu ; Wenyu Zhang ; Cuimiao Zhang ; Wenhui Shi ; Huiteng Tan ; Dan Yang ; Huey Hoon Hng ; Tuti Mariana Lim ; Qingyu Yan
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：June 14, 2012
• 年：2012
• 卷：116
• 期：23
• 页码：12468-12474
• 全文大小：531K
• 年卷期：v.116,no.23(June 14, 2012)
• ISSN：1932-7455

文摘

Novel Cu_xS/Cu (1 < x <2) nanotubes were prepared by a facile wet chemical approach in polyethylene glycol (PEG). Here, Cu nanowires were presynthesized and then converted to nanotubes via a mass diffusion process. A thin PEG layer is physically adsorbed on the nanotube surface. The obtained Cu_xS/Cu nanotubes show good Li storage properties with stable cyclability upon Li ion insertion/extraction, which is attributed to the existence of the PEG capping and the reduced dissolution of Li polysulfides into the electrolytes. Furthermore, Cu_xS/Cu nanotubes with 10 wt % Cu show promising rate capabilities (a fifth-cycle discharge capacity of 282 mA h g^鈥? at a current density of 5 A g^鈥?) due to the enhanced kinetics of charge transfer.