High‐Performance Sodium‐Ion Batteries Enabled by 3D Nanoflowers Comprised of Ternary Sn‐Based Dichalcogenides Embedded in Nitrogen and Sulfur Dual‐Doped Carbon

Abstract

To make sodium‐ion batteries a realistic option for everyday energy storage, a practicable method is to enhance the kinetics of Na+ reactions through the development of structurally stable electrode materials. This study utilizes ternary Sn‐based dichalcogenide (SnS1.5Se0.5) in the design of electrode material to tackle several issues that adversely hinder the performance and longevity of sodium‐ion batteries. First, the incorporation of Se into the SnS structure enhances its electrical conductivity and stability. Second, the ternary composition restricts the formation of intermediates during the desodiation/sodiation process, resulting in better electrode reaction reversibility. Finally, SnS1.5Se0.5 lowers the diffusion barrier of Na, thereby facilitating rapid and efficient ion transport within the electrode material. Moreover, nitrogen and sulfur dual‐doped carbon (NS‐C) is used to enhance surface chemistry and ionic/electrical conductivity of SnS1.5Se0.5, leading to a pseudocapacitive storage effect that presents a promising potential for high‐performance energy storage devices. The study has successfully developed a SnS1.5Se0.5/NS‐C anode, exhibiting remarkable rate capability and cycle stability, retaining a capacity of 647 mAh g−1 even after 10 000 cycles at 5 A g−1 in half‐cell tests. In full‐cell tests, Na3V2(PO4)3//SnS1.5Se0.5/NS‐C delivers a high energy density of 176.6 Wh kg−1. In addition, the Na+ storage mechanism of SnS1.5Se0.5/NS‐C is explored through ex situ tests and DFT calculations. The findings suggest that the ternary Sn‐based dichalcogenides can considerably enhance the performance of the anode, enabling efficient large‐scale storage of sodium. These findings hold great promise for the advancement of high‐performance energy storage devices for practical applications.

Intercalating Elemental Se8 Rings and Cs+ Ions by Layered Selenidostannate: A Semiconductive Material for High-Energy Li-Ion Battery Anodes

“…The reversible capacity of the second cycle is 737 mAh g – , which indicates a 55.3% initial Coulombic efficiency compared to the first cycle (1332 mAh g – ). The low initial Coulombic efficiency may be attributed to the formation of a solid-electrolyte interface layer on the electrode surface, ,, while it is better than that observed for the P–S-graphite (P–S-graphite is an ultrathin P nanolayer formed on the graphite surface through the linking effect of S molecules) and pristine graphite with a cutoff potential of 1.0 V (versus Li/Li + ) …”

“…Among the potential tin-based materials, chalcogenides are more promising due to their unique electrical properties as well as have gained much attention in photovoltaic devices and in batteries field. − Indeed, due to their two-dimensional layered structure, tin-based chalcogenides have been widely investigated as prospective electrodes for LIBs. However, layered and anionic tin chalcogenides were preferred for inserting lithium cations because of the mimic structures of graphite .…”

Significantly enhanced ion‐migration and sodium‐storage capability derived by strongly coupled dual interfacial engineering in heterogeneous bimetallic sulfides with densified carbon matrix

“…The initial wetting and activation of Co 3 S 4 /NiS@N-C electrode is mostly responsible for the decline in R ct during the first 15 cycles. 71 But as the cycle goes on from 15th to 50th, the R ct steadily increases, attributable to the structural pulverization and the reduplicative manufacturing of the instability SEI layer. 72 Taking into account the impressive electrochemical capabilities in the half-cell, the usage possibilities of asprepared Co 3 S 4 /NiS@N-C were assessed by fabricating sodium-ion full cells (SIFCs), which are packaged by using preactivated Co 3 S 4 /NiS@N-C electrode as the anode and Na 3 V 2 (PO 4 ) 3 @C (NVP@C) as the cathode to construct a Co 3 S 4 /NiS@N-C//NVP@C SIFCs.…”