High Rate Capability Core Shell SnO2/Multiwall Carbon Nanotube Nano Composite Electrodes for Li-Ion Batteries

Abstract

In this study, core shell SnO2/MWCNT nanocomposites were produced as a high rate anode material for Li-ion batteries via two steps. Firstly, MWCNT based buckypapers were produced via vacuum filtration techniques. Then, a uniform layer of tin oxide nanocrystals which consist of highly homogenous SnO2 having average mean grain sizes of 7-14 nm was deposited onto the surfaces of buckypapers. The as-prepared nanocomposites were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), galvanostatic charging and discharging and electrochemical impedance spectroscopy (EIS) tests. As anode materials for Li-ion batteries, the nanocomposites showed excellent cyclic retention, with the high specific capacity of 314 mAh g(-1) up to 100 cycles. The special hybrid core shell structure of the as produced nanocomposites are served as electron conductors and volume buffers in the anode electrodes.