Cu5Si–Si/C composites for lithium-ion battery anodes |
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| Affiliation: | 1. Siberian Federal University, 79 Svobodny pr., Krasnoyarsk 660041, Russia;2. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk 660036, Russia;3. Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Akademgorodok 50/24, Krasnoyarsk, 660036, Russia;4. Reshetnev Siberian State University of Science and Technology, Krasnoyarskij rabochij 31, Krasnoyarsk 660037, Russia;1. Department of Chemistry, Fudan University, Shanghai, China;2. Shanghai Institute of Space Power Sources, Shanghai, China;1. Institute for Materials Applications in Mechanical Engineering, RWTH Aachen University, D-52062 Aachen, Germany;2. Institute of Metallurgy, Clausthal University of Technology, D-38678 Clausthal-Zellerfeld, Germany;1. Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230088, China;2. University of Science and Technology of China, Hefei, 230026, China;3. College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China;4. State Key Laboratory of Pollution Control and Resource Reuse Foundation, Tongji University, Shanghai, 200092, China;1. Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, L69 3GJ, United Kingdom;2. Department of Electrical and Electronic Engineering, Xi''an Jiaotong-Liverpool University, Suzhou, 215123, China;3. Stephenson Institute for Renewable Energy, Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, United Kingdom;4. Department of Chemistry, Xi''an Jiaotong-Liverpool University, Suzhou, Jiangsu, 215123, China;5. Dongguan Hongde Battery Ltd.Co., Dongguan, 523649, China;6. Centre for Advanced Materials, University of Liverpool, L69 3GH, United Kingdom |
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| Abstract: | Cu5Si–Si/C composites with precursor atomic ratio of Si:Cu = 1, 2 and 4.5 have been produced by high-energy ball-milling of a mixture of copper–silicon alloy and graphite powder for anode materials of lithium-ion battery. X-ray diffraction and scanning electron microscope measurements show that Cu5Si alloy is formed after the intensive ball milling and alloy particles along with low-crystallite Si are interspersed in graphite uniformly. Cu5Si–Si/C composite electrodes deliver a larger reversible capacity than commercialized graphite and better cyclability than silicon. The increase of copper amount in the composites decreases reversible capacity but improves cycling performance. Cu5Si–Si/C composite with Si:Cu = 1 demonstrates an initial reversible capacity of 612 mAh g−1 at 0.2 mA cm−2 in the voltage range from 0.02 to 1.5 V. The capacity retention is respectively 74.5 and 70.0% at the 40th cycle at the current density of 0.2 and 1 mA cm−2. |
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