Electrochemical performance of nanostructured amorphous Co_3Sn_2 intermetallic compound prepared by a solvothermal route

摘要

A nanostructured amorphous Co_3Sn_2 intermetallic compound was prepared by a solvothermal route. The microstructure and the electrochemical performance were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), galvanostatic cycling, and ex situ XRD. It was found that the as-prepared material is innanoscale and is amorphous. The amorphous Co_3Sr_(12) shows a first specific capacity of 363 mA hg~(-1) compared to 92 mA h g~(-1) for the crystalline one prepared by annealing the amorphous material. Ex situ XRD investigation shows that the amorphous Co_3Sn_2 undergoes a crystallization process during cycling, which leads to the capacity fade.