Controlled Synthesis of Carbon-Coated Cobalt Sulfide Nanostructures in Oil Phase with Enhanced Li Storage Performances

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• 作者：Wenhui Shi ; Jixin Zhu ; Xianhong Rui ; Xiehong Cao ; Charlottle Chen ; Hua Zhang ; Huey Hoon Hng ; Qingyu Yan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：June 27, 2012
• 年：2012
• 卷：4
• 期：6
• 页码：2999-3006
• 全文大小：623K
• 年卷期：v.4,no.6(June 27, 2012)
• ISSN：1944-8252

文摘

A novel solvothermal process was developed for the synthesis of carbon-coated Co₉S₈ nanodandelions using 1-dodecanethiol as the sulfur source and the soft template. Replacing 1-dodecanethiol with sulfur powder as the sulfur source leads to the formation of 20 nm Co₉S₈ nanoparticles without carbon coating. When tested as LIB anode, the C@Co₉S₈ dandelion delivers a specific capacity of 520 mA h g^鈥? at a current density of 1 A g^鈥? (1.8 C) during the 50th cycle, which is much higher than that of Co₉S₈ nanoparticles (e.g. 338 mA h g^鈥?). Furthermore, the C@Co₉S₈ dandelion also exhibits excellent high C-rate performance, e.g., depicts a 10th-cycle capacity of 373 mA h g^鈥? at a current density of 6 A g^鈥? (10.9 C), which is better than that of many reported anode materials. Such synthesis approach is attractive for the preparation of sulfide anode materials with high Li storage properties.

Keywords:

cobalt sulfides; solvothermal; carbon coating; dandelion; nanoparticles; LIB