Preparation of carbon-coated Sn powders and their loading onto graphite flakes for lithium ion secondary battery |
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| Affiliation: | 1. Faculty of Engineering, Aichi Institute of Technology, Yakusa, Toyota 470-0392, Japan;2. ToyoTanso Co. Ltd., Ohnohara-cho, Mitoyo-gun, Kagawa 769-1612, Japan;1. Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China;2. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China;1. Department of BioMechanical Engineering, Delft University of Technology, Delft, The Netherlands;2. Department of Gynecology, Leiden University Medical Center, Leiden, The Netherlands;3. Department of Gynecology, Sint Lucas Andreas Ziekenhuis, Amsterdam, The Netherlands;1. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, No. 1037, Luoyu Road, Wuhan 430074, PR China;2. Nanomaterials and Smart Sensors Research Lab (NSSRL), Department of Materials Science and Engineering, Huazhong University of Science and Technology, No. 1037, Luoyu Road, Wuhan 430074, PR China;3. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luo-shi Road, Wuhan 430070, PR China;1. Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, 730070, China;2. Key Laboratory for Electronic Materials of the State National Affairs Commission, Northwest University for Nationalities, Lanzhou, Gansu, 730030, China;1. College of Chemistry, Central China Normal University, Wuhan 430079, China;2. Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China;3. Pacific Northwest National Laboratory, Richland, WA 99352, USA |
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| Abstract: | Carbon-coated Sn powders were prepared from the powder mixtures of thermoplastic precursor PVA, SnO2 and MgO. The characterization of composite powders synthesized was carried out by XRD, TG, TEM, SEM and anodic performance measurement. SnO2 was reduced to metallic Sn by heating with PVA, and its particle size in carbon shell was around 30–100 nm. MgO existence hindered the agglomeration of molten metallic Sn and made the dispersion of metallic Sn as fine particles possible. They showed high anodic performance in lithium ion batteries; high charge capacity as 500 mAh g?1 even after tenth cycle and stable cyclic performance. The spaces left in carbon shell by MgO after its dissolution were supposed to absorb a large volume expansion of Sn metal particle by Li alloying during discharging. When carbon-coated Sn loaded onto graphite flakes, metallic tin contributed to the increase in capacity. |
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