Deciphering the Sb₄O₅Cl₂–MXene Hybrid as a Potential Anode Material for Advanced Potassium-Ion Batteries

Abstract

Potassium-ion batteries (PIBs) possess great potential in new-generation large-scale energy storage. However, their applications are plagued by large volume change and sluggish reaction kinetics of the electrode materials during the repeated charge/discharge processes. Guided by computerization modeling, we, herein, report the atomic-scale interfacial regulation of Sb4O5Cl2 coupled with structural engineering for the robust anode material of PIBs via simple MXene hybridization using a microwave-assisted hydrothermal method. Benefiting from the ostensive interfacial interplay between Sb4O5Cl2 and Ti3C2, MXene hybridization induces a favorable variation in spin polarization densities and the coordination of Sb atoms in Sb4O5Cl2, which are effective in optimizing the K+ ion diffusion path, thus resulting in a significantly reduced K+ ion diffusion barrier and promoted K+ insertion/extraction kinetics. The as-prepared Sb4O5Cl2–MXene anodes exhibit a highly reversible discharge capacity and decent cyclability, in addition to the low discharge plateau and promising full cell performance. This work is pivotal for not only paving the way for the exploration of anode materials for high-performance PIBs but also shedding light on the fundamental research on K+ ion storage in antimony oxychloride.

In Situ Growth Engineering on 2D MXenes for Next‐Generation Rechargeable Batteries

“…Composite method, using two or more above-mentioned methods, has also been largely used to achieve the in situ growth of materials on 2D MXenes, such as hydrothermal/calcination method, [207][208][209][210][211][212] solvothermal/calcination method, [213] microwave/ hydrothermal method, [214] liquid-phase reduction/calcination method, [215] and in situ polymerization/calcination method. [216] For example, Li and co-workers achieved the in situ growth of CoO nanoparticles on multilayered Ti 3 C 2 MXene (CoO/Ti 3 C 2 ) by a hydrothermal/calcination method (Figure 21a).…”

“…Recently, Shi and coworkers proposed a Sb 4 O 5 Cl 2 –MXene composite anode material for PIBs (Figure 21g). [ 214 ] Sb 4 O 5 Cl 2 was in situ grown on multilayered Ti 3 C 2 by a microwave‐assisted hydrothermal method. SbCl 3 was first added in an aqueous Ti 3 C 2 /CTAB solution to achieve the adsorption of Sb 3+ on MXene.…”

“…g) Schematic showing the fabrication process of Sb 4 O 5 Cl 2 -MXene. Reproduced with permission [214]. Copyright 2022, American Chemical Society.…”

Chemical Prepotassiation Realizes Scalable KC8Foil Anodes for Potassium‐Ion Pouch Cells

“…[64] Then, to evaluate the electrochemical performance of KC 8 anodes in full cells, coin-type PTCDA||KC 8 full cells were assembled at the N/P ratio of 1.5 (Figure S18, Supporting Information). [65][66][67] This cell delivers a discharge capacity of 129 mAh g −1 (calculated based on cathode active mass) at the current density of 100 mA g −1 , and exhibits a high capacity retention of 86.8% after 300 cycles (Figure S19a, Supporting Information) with an average coulombic efficiency of ≈99.97%. For comparison, the electrochemical plated K on Cu foils were utilized as the anode for assembling PTCDA||K full cells with the same N/P ratio, whereas rapid capacity decay within 25 cycles happens (Figure 5b), which is attributed to the poor reversibility of the plated K anode.…”

MXene/CNTs/Aramid Aerogels for Electromagnetic Interference Shielding and Joule Heating

“…Metal matrix composites have significant advantages due to their high conductivity, but their high density, poor corrosion resistance, and high cost hinder their development. In recent years, conductive polymer composites (CPCs) composed of conductive nanoparticles and polymer matrices have attracted comprehensive attention. − Multi-aperture CPCs are potential candidates for lightweight EMI shielding materials because of their outstanding electrical conductivity, good mechanical properties, and excellent chemical stability. − …”