Structure Engineering of BiSbS_x Nanocrystals Embedded within Sulfurized Polyacrylonitrile Fibers for High Performance of Potassium‐Ion Batteries

Abstract

Potassium-ion batteries (PIBs) are regarded as promising candidates in next-generation energy storage technology; however, the electrode materials in PIBs are usually restricted by the shortcomings of large volume expansion and poor cycling stability stemming from a high resistance towards diffusion and insertion of large-sized K ions. In this study, BiSbS x nanocrystals are rationally integrated with sulfurized polyacrylonitrile (SPAN) fibres through electrospinning technology with an annealing process. Such a unique structure, in which BiSbS x nanocrystals are embedded inside the SPAN fibre, affords multiple binding sites and a short diffusion length for K + to realize fast kinetics. In addition, the molecular structure of SPAN features robust chemical interactions for stationary diffluent discharge products. Thus, the electrode demonstrates a superior potassium storage performance with an excellent reversible capacity of 790 mAh g À 1 (at 0.1 A g À 1 after 50 cycles) and 472 mAh g À 1 (at 1 A g À 1 after 2000 cycles). It's one of the best performances for metal dichalcogenides anodes for PIBs to date. The unusual performance of the BiSbS x @SPAN composite is attributed to the synergistic effects of the judicious nanostructure engineering of BiSbS x nanocrystals as well as the chemical interaction and confinement of SPAN fibers.

Highly Resistant LaCo1−xFexO3 Perovskites Used in Chlorobenzene Catalytic Combustion

“…The curve presented two main reduction zones, one from 200 • C to 450 • C and the other from 500 • C to 700 • C. The first corresponds to the reduction of Co 3+ to Co 2+ , whereas the second is attributed to the reduction of Co 2+ to Co 0 [19]. As mentioned by Ciambelli et al [20] and Barbero et al [21], Fe 3+ would not be reduced under the experimental conditions of the TPR measurement. In agreement with these results, the green curve in Figure 4 is observed to be completely flattened.…”

Rational Design of Bismuth Metal Anodes for Sodium-/Potassium-Ion Batteries: Recent Advances and Perspectives

“…By matching the K 4 Fe(CN) 6 Prussian blue cathode with the composite bismuth-antimony alloy anode, the full PIB can still deliver a high discharge capacity of 396 mA h g −1 after 70 cycles at 200 mA g −1 . Li et al [89] developed a distinct design in which BiSbS x was uniformly inserted into sulfide polyacrylonitrile (SPAN) fibers by electrospinning and annealing techniques. BiSb nanoparticles provide multiple active sites and a short diffusion distance.…”