Abstract
Ferrosilicon, industrial grade silicon, solar grade silicon, and electronic grade silicon were ball-milled to form four types of silicon powders, which were mixed with graphite powders at weight ratio of 5:95, respectively, for being used as graphite–silicon anode materials in lithium-ion batteries (LIBs). The effect of the purity of silicon on its electrochemical performance in graphite–silicon anode materials for LIBs was investigated by the cycle and rate tests. Results show that silicon with higher purity shows higher capacity, better cycle, and rate performance. In addition, the significant difference in capacity of the four graphite–silicon anodes with different purities of silicon is not completely resulted from the content of silicon materials, and the influence of the impurity inside the silicon cannot be ignored as well. The sample prepared from electronic grade silicon presents the highest first discharge capacity, which is 440.5 mAh g−1.
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Acknowledgements
This work is supported by China Postdoctoral Science Foundation (2016M592115), Jiangxi Postdoctoral Foundation (2015KY12) and Jiangxi Education Department (150184).
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Jin, C., Xu, G., Liu, L. et al. Purity of silicon: with great effect on its performance in graphite–silicon anode materials for lithium-ion batteries. Appl. Phys. A 123, 578 (2017). https://doi.org/10.1007/s00339-017-1190-0
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DOI: https://doi.org/10.1007/s00339-017-1190-0