Hierarchically 3D structured milled lamellar MoS2/nano-silicon@carbon hybrid with medium capacity and long cycling sustainability as anodes for lithium-ion batteries
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第9期
论文作者：Peng Zhang Qiang Ru Honglin Yan Xianhua Hou Fuming Chen Shejun Hu Lingzhi Zhao
文章页码：1840 - 1850
摘 要：A hierarchically 3 D structured milled lamellar MoS2/nano-silicon@carbon hybrid with medium capacity and long-term lifespan is designed by a green and scalable approach using ball milling process and spraydrying/pyrolysis routes.The microspheres consist of low-content nano-silicon（20 wt%）,milled lamellar MoS2 sheets and porous carbon skeletons.A mixture of silicon nanoparticles and MoS2 flakes serves as an inner core,while porous carbon pyrolyzed from petroleum pitch acts as a protective shell.The particular architecture affords robust mechanical support,abundant buffering space and enhanced electrical conductivity,thus effectively accommodating drastic volume variation during repetitive Li+ intercalation/extraction.The Si/MoS2@C hybrid delivers a high initial discharge specific capacity of 1257.8 mA hg-1and exhibits a reversible capacity of 767.52 mAhg-1 at a current density 100 mAg-1after 250 cycles.Most impressively,the electrode depicts a superior long-cycling durability with a discharge capacity of537.6 mA hg-1even after 1200 cycles at a current density of 500 mAg-1.Meanwhile,the hybrid also shows excellent rate performance such as 388.1 mA hg-1even at a large current density of 3000 mAg-1.
Peng Zhang1,2,3，Qiang Ru1,2,3，Honglin Yan1,2,3，Xianhua Hou1,2,3，Fuming Chen1,2,3，Shejun Hu1,2,3，Lingzhi Zhao4
1. Guangdong Engineering Technology Research Center of Efficient Green Energy and Environmental Protection Materials, South China Normal University2. Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University3. Engineering Research Center of Materials and Technology for Electrochemical Energy Storage (Ministry of Education)4. Institute of Optoelectronic Materials and Technology, South China Normal University
摘 要：A hierarchically 3 D structured milled lamellar MoS2/nano-silicon@carbon hybrid with medium capacity and long-term lifespan is designed by a green and scalable approach using ball milling process and spraydrying/pyrolysis routes.The microspheres consist of low-content nano-silicon（20 wt%）,milled lamellar MoS2 sheets and porous carbon skeletons.A mixture of silicon nanoparticles and MoS2 flakes serves as an inner core,while porous carbon pyrolyzed from petroleum pitch acts as a protective shell.The particular architecture affords robust mechanical support,abundant buffering space and enhanced electrical conductivity,thus effectively accommodating drastic volume variation during repetitive Li+ intercalation/extraction.The Si/MoS2@C hybrid delivers a high initial discharge specific capacity of 1257.8 mA hg-1and exhibits a reversible capacity of 767.52 mAhg-1 at a current density 100 mAg-1after 250 cycles.Most impressively,the electrode depicts a superior long-cycling durability with a discharge capacity of537.6 mA hg-1even after 1200 cycles at a current density of 500 mAg-1.Meanwhile,the hybrid also shows excellent rate performance such as 388.1 mA hg-1even at a large current density of 3000 mAg-1.
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