Polypyrrole-Wrapped SnS₂ Vertical Nanosheet Arrays Grown on Three-Dimensional Nitrogen-Doped Porous Graphene for High-Performance Lithium and Sodium Storage

Abstract

The two-dimensional layered material tin disulfide (SnS 2 ) has a high theoretical capacity for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) due to its combination of conversion and alloying reactions during the charge-storage process. However, the intrinsic poor conductivity and huge volume changes impede its practical applications. In this work, a design of in situ growth and polymerization is developed to synthesize polypyrrole wrapped SnS 2 vertical nanosheet arrays grown on nitrogen-doped three-dimensional graphene (PPy@SnS 2 @N3DG). The PPy@SnS 2 @ N3DG composite, with the unique free-standing hierarchical structure and the synergy of three components, exhibits excellent rate capability and superior cycling stability. Based on the features of high capacity, lightweight, and facile preparation, the PPy@SnS 2 @ N3DG composite can be considered as a promising electrode for energy storage devices.

One-Step Urothermal Synthesis of Li+-Intercalated SnS2 Anodes with High Initial Coulombic Efficiency for Li-Ion Batteries

“…The CV curves of the Li 0.4 SnS 2 electrode and the SnS 2 electrode exhibit similar shapes in Figure a,b, indicating that similar electrochemical behaviors occurred during the charge–discharge process. During the first cycle of SnS 2 , the cathodic peak appear around 1.81 V, corresponding to the intercalation reaction without phase decomposition . Differently, this peak of Li 0.4 SnS 2 is weaker here, which is due to the pre-intercalation of the additional Li source occupying the sites of Li + during the synthesis process. , For Li 0.4 SnS 2 and SnS 2 electrodes, the anodic peaks appearing at 1.06 and 1.05 V during discharge can be ascribed to the conversion reaction and the formation of SEI film, and the peaks less than 0.5 V belong to the alloying reaction .…”

Recent advances in SnS2-based nanomaterials as high-performance anodes for sodium ion batteries

“…9a). 76 Fig. 9b displays the SEM image of the composite, where the SnS 2 nanosheets are vertically arranged on the surface of N3DG and the PPy was wrapped on the SnS 2 nanosheets to make it thicker and more stable.…”

“…Copyright 2021, reprinted with permission from American Chemical Society. 76 (e) TEM and (f) HRTEM images of the MWNT@SnS 2 NS@C composite. (g) Cycling performance of the SnS 2 NS, MWNT@SnS 2 NS, MWNT@SnS 2 @C, and MWNT@SnS 2 NS@C anodes at 100 mA g −1 .…”

Covalent Bond Hybrid Nanostructure of N-doped rGO and Ultrathin SnS2 with High Porosity for Lithium-Ion Batteries

“…Carbon has been used to create voids, buffer the volume expansion of non-carbon, and provide a shell for the formation of a stable solid electrolyte interphase (SEI). In addition, nitrogen-doped graphene has been used as a carrier for tin sulfides and other anode materials. , The performance of nitrogen-doped graphene composite was further improved and more favorable properties were obtained, such as improving conductivity for faster charge transfer and additional lithium storage induced at more defect sites. − The sacrificial template (PMMA, SiO 2 , etc.) method was usually used to improve the porosity of active materials and improve cycle stability. , Therefore, the combination of ultrathin SnS 2 and high porosity nitrogen-doped graphene would be an effective way to improve the anode performance of lithium-ion batteries.…”