Synthesis and Electrochemical Properties of Multi-Layered Sno/Rgo Composite as Anode Materials for Sodium Ion Batteries

Abstract

Metal oxide-based anodes have gained attention due to their high theoretical capacity for Sodium–Ion Batteries (SIBs). However, their practical application is restricted by huge volume expansion and low electric conductivity because of continuous cycling. This paper uses tin oxide/reduced graphene oxide (SnO/rGO) composites to solve the problems of low discharge capacity and poor cycling stability. The SnO/rGO nanocomposite electrode exhibits improved discharge capacities, superior stability, and excellent rate property (a discharge capacity of 391.9 mAh/g at 100 mA/g after 120 cycles with capacity retention of 96.2% and 338.7 mAh/g after 500 cycles at 500 mA/g with capacity retention of 92.2%). Also, ex-situ XRD measurements are conducted to analyze the Na+ storage process in SnO. The results are expected to expand the prospects of SnO/rGO nanocomposite anode for application in the sodium–ion battery.

Keywords: Anode materials, Sodium ion batteries, Ex-situ XRD, Sodium storage mechanism, SnO, Reduced Graphene Oxide