Phase-Controlled Synthesis of Cobalt Sulfides for Lithium Ion Batteries

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• 作者：Yaoming Wang ; Jianjun Wu ; Yufeng Tang ; Xujie L眉 ; Chongyin Yang ; Mingsheng Qin ; Fuqiang Huang ; Xin Li ; Xia Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：August 22, 2012
• 年：2012
• 卷：4
• 期：8
• 页码：4246-4250
• 全文大小：440K
• 年卷期：v.4,no.8(August 22, 2012)
• ISSN：1944-8252

文摘

The polyhedral CoS₂ with a narrow size distribution was synthesized by a facile solid-state assembly process in a sealed silica tube. The flux of potassium halide (KX; X = Cl, Br, I) plays a crucial role in the formation of polyhedrons and the size distribution. The S₂2鈥?/sup> groups in CoS₂ can be controllably withdrawn during heat treatment in air. The obtained phases and microstructures of CoS₂, Co₃S₄, CoS, Co₉S₈, and CoO depended on heating temperature and time. These cobalt materials, successfully used as the electrodes of lithium ion batteries, possessed good cycling stability in lithium ion batteries. The discharge capacities of 929.1 and 835.2 mAh g^鈥? were obtained for CoS₂ and CoS respectively, and 76% and 71% of the capacities remained after 10 cycles. High capacities and good cycle performance make them promising candidates for lithium ion batteries. The approach combining solid-state assembly and heat treatment provides a simple and versatile way to prepare various metal chalcogeides for energy storage applications.

Keywords:

cobalt sulfides; solid-state assembly; polyhedrons; electrode materials; lithium ion batteries; cycling stability