Reduced graphene oxide wrap buffering volume expansion of Mn2SnO4 anodes for enhanced stability in lithium-ion batteries

Abstract

MSnO₄ (M = Mn, Zn, Co, Mg, etc.) has been widely investigated as an anode material for lithium-ion batteries in recent years, but its practical applications are limited by serious capacity loss caused by severe volume expansion during Li⁺ insertion/extraction. So far, hollow structures, carbon coating, and encapsulation by reduced graphene oxide have been introduced to improve the electrochemical properties of MSnO₄. In this study, Mn₂SnO₄ nanoparticles@reduced graphene oxide (Mn₂SnO₄@rGO) composites were prepared using simple steps and applied as anode materials for lithium-ion batteries. The rGO sheet encapsulated Mn₂SnO₄ nanoparticles show improved electrochemical properties. The first discharge capacity of Mn₂SnO₄@rGO reaches 1223.5 mAh g⁻¹ and remains at 542.0 mAh g⁻¹ after 100 cycles at a current density of 0.1 A g⁻¹. The electrochemical properties were significantly improved compared to those of pure Mn₂SnO₄ nanoparticles.