RGO-Coated MOF-Derived In₂Se₃ as a High-Performance Anode for Sodium-Ion Batteries

Abstract

MOF-derived metal selenides are promising candidates as effective anode materials in sodium-ion batteries (SIBs) owing to their ordered carbon skeleton structure and the high conductivity of selenides. They can be imparted with rapid electron/ion transport channels for the insertion/de-insertion of Na + . In this study, MOFderived In2Se3 was prepared as an anode material for SIBs. However, the large volume expansion during cycling leads to structural collapse, which affects the charging and discharging circulation life of the battery. To address this, a two-dimensional rGO network was introduced on the MOF-derived In2Se3 surface by surface modification. Field-emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS) results confirmed the successful synthesis of the In2Se3@C/rGO composite. The structures with two types of carbon enhanced the charge transfer kinetics and provided two stress-buffering layers. Thus, the volume change could be accommodated and simultaneously, electron transfer was accelerated. This technique was effective, as proved by the enhanced capacity retention of 95.2% at 1 A•g −1 after 500 cycles. In contrast, the capacity retention of the MOF-derived material without rGO was only 74.2%. Additionally, due to the synergistic effect of the rGO network and the MOF-derived In2Se3, the anode showed a superior capacity of 468 mAh•g −1 at 0.1 A•g −1 . Conversely, at the same current density, the uncoated material delivered only a capacity of 393 mAh•g −1 . To study the electrochemical process of the electrode, the In2Se3@C/rGO electrode was subjected to cyclic voltammetry (CV) measurements; the results showed that the In2Se3@C/rGO electrode had notable electrochemical reactivity. In addition, in situ X-ray diffraction (XRD) was performed to explore the sodium storage mechanism of In2Se3, demonstrating that In2Se3 had a dual Na + storage mechanism involving conversion and alloying reactions, and revealing the origin of its high theoretical specific capacity. This study is expected to serve as a reference for preparing optimized rGO-based materials for use as SIB anodes.

Green Large-Scale Preparation of Na3V2(PO4)3 with Good Rate Capability and Long Cycling Lifespan for Sodium-Ion Batteries

“…With a further increase in the sweep rates, all of the cathodic peaks shift toward higher potentials, whereas the anodic peaks shift toward lower potentials. This phenomenon is attributed to the significant polarization at elevated scan rates. , Figure S6 displays the CV curves obtained from NVP/C and NVP electrodes at 0.1 mV s –1 , exhibiting similarity to those observed in the NVP/C–Na electrodes. Electrochemical impedance spectroscopy (EIS) was employed to further explore the dynamics exhibited by the Na 3 V 2 (PO 4 ) 3 materials.…”

Enhancing Sodium-Ion Transport by Hollow Nanotube Structure Design of a V5S8@C Anode for Sodium-Ion Batteries

“…In light of economic progress and the escalating energy crises, the global demand for energy is witnessing a significant surge across various countries. Addressing the challenge of greenhouse gas emissions and reducing reliance on fossil fuels necessitate a comprehensive utilization of renewable energy sources, such as solar and wind energy. , Consequently, the development of efficient energy storage systems (EES) assumes paramount importance. , By effectively storing excess energy generated from renewable sources, EES technologies play a crucial role in meeting energy demands, enhancing grid stability, and ensuring a reliable and sustainable energy supply. Currently, lithium-ion batteries have achieved successful applications in various fields, including mobile devices, automobiles, and energy storage. , However, the widespread adoption of lithium-ion batteries in EES has been somewhat hindered due to the limited availability and high costs associated with lithium. , Therefore, extensive research has been conducted on alternative ion batteries. − Among these alternatives, sodium-ion batteries (SIBs) have become the most promising choice for large-scale EES, primarily owing to their abundant reserves and lower costs. , Nonetheless, it is important to note that the larger radius of Na + (1.02 Å) relative to Li + (0.68 Å) necessitates the larger interlayer spacing and a more stable electrode structure .…”

“…1,2 Consequently, the development of efficient energy storage systems (EES) assumes paramount importance. 3,4 By effectively storing excess energy generated from renewable sources, EES technologies play a crucial role in meeting energy demands, enhancing grid stability, and ensuring a reliable and sustainable energy supply. Currently, lithium-ion batteries have achieved successful applications in various fields, including mobile devices, automobiles, and energy storage.…”

Bimetal Oxide Reduction-Induced Perforation Strategy for Preparing a Multi-Microchannel Graphene-Based Anode Material with Rapid Sodium-Ion Diffusion

“…Based on the Na + storage mechanism, anode materials are composed of three types: intercalation (carbon- and titanium-based composite), conversion (transitional metal oxides and chalcogenides − ), and alloying (Si, Ge, Sn, P). Transition-metal chalcogenides have become prospective anode materials owing to supreme capacity and excellent structural stability. , Among them, transitional metal selenides (TMSs) possess increased electrochemical reaction activity owing to the weaker metal–Se bonds compared with metal–S or metal–O bonds. − However, their inherent shortcomings, namely, poor electrical conductivity together with significant volume variation and polyselenide dissolution during conversion reactions, induce abominable rate capability and serious capacity decay. To resolve these, the incorporation of carbonaceous materials and the design of bimetal selenides have been identified as two effective protocols to achieve excellent electrochemical properties .…”

“…Transition-metal chalcogenides have become prospective anode materials owing to supreme capacity and excellent structural stability. 28,29 Among them, transitional metal selenides (TMSs) possess increased electrochemical reaction activity owing to the weaker metal−Se bonds compared with metal−S or metal−O bonds. 30−32 However, their inherent shortcomings, namely, poor electrical conductivity together with significant volume variation and polyselenide dissolution during conversion reactions, 33 induce abominable rate capability and serious capacity decay.…”