In2S3 nanosheets array anchored on reduced graphene oxide as high-performance anode for sodium-ion batteries

Abstract

Indium sulfide has been proved to be a high-capacity anode material for sodium-ion batteries, but severe volume changes and low electrical conductivity limit its practical electrochemical performance. Based on this, graphene (RGO)-loaded In 2 S 3 nanosheets array composites (In 2 S 3 /RGO) are synthesized by a simple reflux method to enhance charge transfer and ion diffusion kinetics as well as the structural stability of electrodes. By optimizing the amount of RGO, In 2 S 3 /RGO exhibits a high specific capacity of 450 mAh g −1 at 2 A g −1 after 500 cycles with a capacity fading of 0.04% per cycle (from 2nd to 500th) and remarkable rate performance of 460 mAh g −1 at 12 A g −1 . The XRD and HRTEM analysis indicates that In 2 S 3 /RGO is based on a conversion mechanism for energy storage. Furthermore, the In 2 S 3 /RGO//Na 3 V 2 (PO 4 ) 3 full cell is successfully fabricated. The simple and efficient synthesis method and the excellent sodium storage properties offer great prospects for the practical application of In 2 S 3 /RGO. The graphene (RGO)-modified In 2 S 3 nanosheet array composites (In 2 S 3 /RGO) are first synthesized for SIBs. It shows excellent rate capability (758.2 mAh g −1 at 0.5 A g −1 and 460 mAh g −1 even at 12 A g −1 ) and cycle stability (450 mAh g −1 at 2 A g −1 after 500 cycles) for Na + storage. And ex-situ XRD and HRTEM results revealed that In 2 S 3 /RGO is based on a conversion mechanism for Na-ion storage. • In situ growth of In 2 S 3 nanosheet arrays on RGO was achieved by a simple reflux method. • The In 2 S 3 /RGO composite exhibits ultratable cycling performance and ultrahigh rate capability. • The redox reactions are dominated by pseudocapacitive behavior. • Revealed the energy storage mechanism of In 2 S 3 /RGO by ex-situ XRD patterns and HRTEM images.