High stability SEI film on the surface of Sb2O5/carbon cloth by coating SiO2 as high performance LIBs and SIBs anodes

Sb2O5 is considered as a high capacity promising anode for LIBs and SIBs due to its high theoretical capacity of 1324 mAh.g(-1). However, the large volume expansion during the cycling process makes the SEI film on its surface continuously reorganize and even break, which limits its electrochemical performance. In this work, we construct an anode consisting of Sb2O5 nanoparticles grown on carbon cloth with coating SiO2 (denoted as SiO2/Sb2O5/CC) to improve the structure of SEI film, which realizes stable SEI film and brings high energy storage performance. When SiO2/Sb2O5/CC composites are used as anode material for LIBs and SIBs, they both have high specific capacity and stable cycle performance (909.5 mAh.g(-1) at 1 A.g(-1) after 500 cycles) in LIBs and (630.7 mAh.g(-1) at 200 mA.g(-1) after 150 cycles) in SIBs. That is attributed to the SiO2 has a positive synergistic effect on the structure and electrochemical properties of Sb2O5 materials. Specifically, the existence of SiO2 slows down the repeated fracture and recombination of SEI film caused by the volume effect of Sb2O5. So the reversibility of electron and ion transport is better, and the capacity retention is better. Consequently, this wok can provide new insight for exploration and design of Sb2O5 anode materials for LIBs and SIBs. (C) 2021 Published by Elsevier B.V.

Automated summary

SiO2/Sb2O5/CC composites as anode materials for LIBs and SIBs show high specific capacity and stable cycle performance, attributed to the positive synergistic effect of SiO2 on the structure and electrochemical properties of Sb2O5 materials.