Dopamine-Induced Formation of Ultrasmall Few-Layer MoS2 Homogeneously Embedded in N-Doped Carbon Framework for Enhanced Lithium-Ion Storage

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• 作者：Zhao-Hua Miao ; Pan-Pan Wang ; Yu-Chen Xiao ; Hai-Tao Fang ; Liang Zhen ; Cheng-Yan Xu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：December 14, 2016
• 年：2016
• 卷：8
• 期：49
• 页码：33741-33748
• 全文大小：486K
• ISSN：1944-8252

文摘

Molybdenum disulfide with a layered structure and high theoretical capacity is attracting extensive attention for high-performance lithium-ion batteries. In this study, a simple and scalable method by freeze-drying of (NH₄)₂MoS₄ and dopamine mixed solutions along with subsequent calcination is developed to realize the self-assembly of hierarchical MoS₂/carbon composite nanosheets via the effect of dopamine-induced morphology transformation, in which ultrasmall few-layer MoS₂ nanosheets were homogeneously embedded into a N-doped carbon framework (denoted as MoS₂@N-CF). The embedded ultrasmall MoS₂ nanosheets (∼5 nm in length) in the composites consist of less than five layers with an expanded interlayer spacing of the (002) plane. When tested as anode materials for rechargeable Li-ion batteries, the obtained MoS₂@N-CF nanosheets exhibit outstanding electrochemical performance in terms of high specific capacity (839.2 mAh g^–1 at 1 A g^–1), high initial Coulombic efficiency (85.2%), and superior rate performance (702.1 mAh g^–1 at 4 A g^–1). Such intriguing electrochemical performance was attributed to the synergistic effect of uniform dispersion of few-layer MoS₂ into the carbon framework, expanded interlayer spacing, and enhanced electronic conductivity in the unique hierarchical architecture. This work provides a simple and effective strategy for the uniform integration of MoS₂ with carbonaceous materials to significantly boost their electrochemical performance.