Abstract
Modified Si nanoparticles were investigated as an anode material for lithium-ion batteries. The Si nanoparticle surfaces were modified with conductive, N-doped carbon layers and prepared by a simple pyrolysis process using an ionic liquid that contained nitrogen. After the heat treatment, the N-doped carbon layers were uniformly coated onto the Si nanoparticles. The smooth carbon layers connected the Si nanoparticles without any morphological changes. Si nanoparticles containing 34 wt.% N-doped carbon exhibited the best electrochemical performance with a capacity of ∼1145 mAh g−1 and excellent capacity retention over 100 cycles. The high electrochemical performance was attributed to the N-doped carbon layers that improved the electrical conductivity and minimized the volume expansion associated with the alloy during cycling.
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Acknowledgments
This research was supported by the Ministry of Trade, Industry and Energy (MOTIE), Korea Institute for Advancement of Technology (KIAT) through the Encouragement Program for The Industries of Economic Cooperation Region) (No. G02A01210004401) and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2015R1C1A1A01051733).
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Sasidharachari, K., Na, BK., Woo, SG. et al. Facile conductive surface modification of Si nanoparticle with nitrogen-doped carbon layers for lithium-ion batteries. J Solid State Electrochem 20, 2873–2878 (2016). https://doi.org/10.1007/s10008-016-3291-7
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DOI: https://doi.org/10.1007/s10008-016-3291-7