This study reports a high-performance hybrid lithium-ion anode material using coaxially coated tin (Sn) shells on vertically aligned carbon nanofiber (VACNF) cores. The robust brush-like highly conductive VACNFs effectively connect high-capacity tin shells for lithium-ion storage. A high specific capacity of 800 mAh g-1 of Sn was obtained at C/5 rate, reaching to the maximum value of amorphous Sn. However, the electrode shows poor cycling performance with conventional LiPF6 based electrode. The addition of fluoroethylene carbonate (FEC) improves the performance significantly and Sn-coated VACNFs anode shows stable cycling performance. The Sn-coated VACNF array anodes exhibit outstanding capacity retention in the half-cell tests with electrolyte containing 10% of added FEC and could deliver a reversible capacity of 600 mAh g-1 after 50 cycles at 0.5 C rate.

Electrochemical properties of tin-coated vertically aligned carbon nanofiber array anode for Li-ion storage

255th National Meeting (2018)

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