1. Facile conductive surface modification of Si nanoparticle with nitrogen-doped carbon layers for lithium-ion batteries.
- Author
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Sasidharachari, Kammari, Na, Byung-Ki, Woo, Sang-Gil, Yoon, Sukeun, and Cho, Kuk
- Subjects
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LITHIUM-ion batteries , *SILICON analysis , *PERFORMANCE of anodes , *NITROGEN analysis , *PYROLYSIS kinetics , *CONDUCTIVITY of electrolytes , *ELECTROCHEMICAL electrodes - 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 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. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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