Details

Autor(en) / Beteiligte

• Miao, Zhao-Hua
• Wang, Pan-Pan
• Xiao, Yu-Chen
• Fang, Hai-Tao
• Zhen, Liang
• Xu, Cheng-Yan

Titel

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

Ist Teil von

• ACS applied materials & interfaces, 2016-12, Vol.8 (49), p.33741-33748

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.