High-Performance\nand Reactivation Characteristics\nof High-Quality, Graphene-Supported SnS₂ Heterojunctions\nfor a Lithium-Ion Battery Anode

Abstract

SnS₂ has received tremendous attention as an anode material\nfor lithium-ion batteries owing to its high theoretical capacity and\nlow cost. However, its applications are limited by its inferior cycling\nstability and poor rate performance. In this study, graphene@SnS₂ heterojunction nanocomposites are synthesized using a microwave-assisted\nsolvothermal approach on liquid-phase exfoliated graphene (LEGr).\nCompared with graphene oxides, LEGr layers with an intrinsic atomic\nstructure show extraordinary conductivity and serve as robust substrates\nfor in situ growth of SnS₂ with improved interfacial contact.\nA LEGr-derived SnS₂ hybrid shows remarkable storage capacity,\nsuperior rate capability, and excellent cycling stability. The storage\ncapacity remains at 664 mAh g^–1 after 200 cycles\nat 300 mA g^–1 current density. Furthermore, lithiation-induced\nreactivation of LEGr-based SnS₂ is investigated using in\nsitu transmission electron microscopy, giving an in-depth explanation\nof the electrochemical reaction mechanisms.