Lithium-storage properties of SiO2 nanotubes@C using carbon nanotubes as templates |
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| Institution: | 1. College of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China;2. Collaborative Innovation Center of Guizhou Province for Efficient Utilization of Phosphorus and Fluorine Resources, Guizhou University, Guiyang, 550025, China;1. Institute of Nuclear and New Energy Technology, Cooperation Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing, 100084, China;2. Center for Combustion Energy, Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China;1. State Key Laboratory of Food Nutrition and Safety, Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin, 300457, China;2. Research Center for Fermentation Engineering of Hebei, College of Bioscience and Bioengineering, Hebei University of Science and Technology, Shijiazhang, 050000, China;3. Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60695, Poznan, Poland;1. Power and Flow Group, Department of Mechanical Engineering, Eindhoven University of Technology, PO Box 513, 5600MB, Eindhoven, the Netherlands;2. Eindhoven Institute for Renewable Energy Systems (EIRES), PO Box 513, 5600MB, Eindhoven, the Netherlands;1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China;2. Center for Particle-Laden Turbulence, Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China, Department of Mechanics and Engineering Science, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, 730000, China |
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| Abstract: | Silica-based anode material is the most concerned material at present, which has the advantages of good cycle stability, high theoretical specific capacity and abundant reserves. However, silica suffers from inherent low conductivity, severe volume expansion effect and low initial coulombic efficiency, which limits its application in lithium-ion batteries. Nanotubes structure can mitigate the volume expansion during lithiation/delithiation. In this article, silica nanotubes (SNTs) were prepared using carbon nanotubes (CNTs) as a template, and then the uniform carbon layer was coated on their surface by carbonization of citric acid. The hollow structure of nanotubes provides more sites for the insertion of Li+ during lithiation and additional channels for Li+ migration in the cycles, which improves the electrochemical performance. Conductivity can be enhanced by coating carbon layer. The specific capacity of the composite material is about 650 mAh g−1 at 0.1 A g−1 after 100 cycles. With a specific capacity of 400 mAh g−1 even at 1 A g−1 after 100 cycles. The silica-based material is a competitive anode material for lithium-ion batteries. |
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| Keywords: | Hard template MWCNT Lithium-ion batteries |
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