Electrochemical performance of SiOC anodes prepared by a different silicone |
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Authors: | Junzhan Zhang Hongxia Chen Jian Wei Ying Zhang Linxiang Wang |
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Affiliation: | College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an, P. R. China |
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Abstract: | SiOC is one of the most promising anodes for lithium-ion batteries, which shows the good structural stability and high capacity comparing to commercial graphite anode. In this paper, different SiOC anodes (SiOC-217, SiOC-H44, and SiOC-MK) were prepared from polymer precursors with different side groups (phenyl, methyl-phenyl, methyl) to investigate the effects of free carbon on the electrochemical performance of SiOC anodes. The results of X-ray photoelectron spectroscopy presented that SiOC was composed by different SiOxC4−x units and free carbon phase. The initial discharge capacity of SiOC-217 was 742.67 mA h g−1. After 100 cycles, the reversible capacity of SiOC-217 reached 450.65 mA h g−1 at 0.2 C, indicating a capacity retention rate of 60.68%. After cycling at high current densities, SiOC-217 exhibited a high discharge capacity of 592.88 mA h g−1 at 0.1 C. SiOC-217 exhibited excellent electrochemical performance due to the high content of free carbon phase. Furthermore, the high contents of SiO2C2 and SiO3C units further enhanced the improvement of electrochemical performance. |
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Keywords: | anode electrochemical performance free carbon silicon oxycarbide |
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