Abstract
The silicon/graphite (Si/G) composite was prepared using pyrolytic polyacrylonitrile (PAN) as carbon precursor, which is a nitrogen-doped carbon that provides efficient pathway for electron transfer. The combination of flake graphite and pyrolytic carbon layer accommodates the large volume expansion of Si during discharge-charge process. The Si/G composite was synthesized via cost-effective liquid solidification followed by carbonization process. The effect of PAN content on electrochemical performance of composites was investigated. The composite containing 40 wt% PAN exhibits a relatively better rate capability and cycle performance than others. It exhibits initial reversible specific capacity of 793.6 mAh g−1 at a current density of 100 mA g−1. High capacity of 661 mAh g−1 can be reached after 50 cycles at current density of 500 mA g−1.
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Acknowledgements
The authors are highly grateful for the financial support from the National Natural Science Foundation of China (No. 51404038, 51472034), the Educational Commission of Hubei Province Foundation of China (No. B2016040), and the Yangtze Youth Talents Fund (No. 2015cqr14).
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Zhao, Q., Xiao, W., Yan, X. et al. Effect of pyrolytic polyacrylonitrile on electrochemical performance of Si/graphite composite anode for lithium-ion batteries. Ionics 23, 1685–1692 (2017). https://doi.org/10.1007/s11581-017-1992-2
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DOI: https://doi.org/10.1007/s11581-017-1992-2