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 In2S3 nanosheets array composites (In2S3/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, In2S3/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 In2S3/RGO is based on a conversion mechanism for energy storage. Furthermore, the In2S3/RGO//Na3V2(PO4)(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 In2S3/RGO. (C) 2022 Published by Elsevier B.V.

Automated summary

In this study, graphene-loaded indium sulfide nanosheets array composites (In2S3/RGO) were synthesized to enhance the performance of sodium-ion batteries. The optimized In2S3/RGO material exhibited high specific capacity, excellent cycling stability, and remarkable rate performance. XRD and HRTEM analysis revealed the conversion mechanism for energy storage in In2S3/RGO.