Ce2O2S anchored on graphitized carbon with tunable architectures as a new promising anode for Li-ion batteries

Abstract

Flower-like and dicranopteris-like Ce₂O₂S/carbon composites have been originally prepared by the heat treatment of S-containing ion-exchange resin and cerium acetate. The structure and morphology of the Ce₂O₂S/carbon are investigated by XRD, SEM, TEM and STEM. The flower-like Ce₂O₂S is self-assembled by porous single crystalline Ce₂O₂S sheets which are well anchored on carbon. The dicranopteris-like Ce₂O₂S/carbon is also comprised of single crystalline ‘Ce₂O₂S leaves’ surrounded by a carbon layer. The electrochemical performances of flower-like and dicranopteris-like Ce₂O₂S/carbon are studied by CV, galvanostatic discharge–charge tests and electrochemical impedance spectroscopy (EIS) measurements. The results show that the Ce₂O₂S/carbon has stable specific capacity up to 627 mA h g⁻¹ after 180 cycles at a constant current density of 50 mA g⁻¹ between 0.01 and 3 V. This performance can make it a choice as a potential anode material for Li-ion batteries.