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 with their high theoretical capacity for Sodium–Ion Batteries (SIBs). However, their practical application is restricted due to huge volume expansion and low electronic conductivity caused by 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 specific capacity, 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 at 500 mA/g after 500 cycles with capacity retention of 92.2 %). Also, ex-situ XRD measurements are conducted to analyze the Na+ storage process in SnO. This study aims to expand the prospects of SnO/rGO nanocomposite anode for application in SIBs. © 2022 The Authors