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

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.