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Enhanced cycle performance of SiO-C composite anode for lithium-ion batteries |
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| Authors: | Jae-Hun Kim Hun-Joon Sohn Hansu Kim Goojin Jeong Wanuk Choi |
| Affiliation: | aSchool of Materials Science and Engineering, Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-742, Republic of Korea bEnergy and Materials Laboratory, Samsung Advanced Institute of Technology, Yongin-si, Gyeounggi-do 449-712, Republic of Korea cEnergy Laboratory, Samsung SDI, Youngtong-gu, Suwon-si, Gyeonggi-do 443-731, Republic of Korea |
| Abstract: | A silicon monoxide (SiO)-carbon composite prepared by ball-milling and pyrolysis is evaluated as an anode material for lithium-ion batteries. Electrochemical tests demonstrated that the first charge and discharge capacities of the material are about 1050 and 800 mAh g−1, respectively, with a first-cycle efficiency of 76%. The disproportionation reaction of pure SiO into Si and SiO2 during pyrolysis is confirmed by means of XRD and 29Si MAS NMR. The cycle performance of this material shows an excellent reversible capacity retention of 710 mAh g−1 over 100 cycles without any potential or capacity restrictions. This improved cycle performance is attributed to the stable microstructure, enhanced electrical contact afforded by the pyrolyzed carbon, and the amorphous phase transformation of the active material during cycling. |
| Keywords: | Silicon monoxide (SiO) Lithium-ion battery Carbon composite Capacity Cycle performance Volume change |
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