Enhancing Catalytic Conversion of Polysulfides by Hollow Bimetallic Oxide-Based Heterostructure Nanocages for Lithium-Sulfur Batteries

Abstract

Performance improvement of lithium-sulfur batteries (LSBs) is restricted by the dissolution and shuttle of lithium polysulfides (LiPSs). Prussian blue analogs (PBAs) and their derived nanomaterials are ideal sulfur-fixing materials owing to their abilities to anchor LiPSs, accelerate redox conversion, and smooth Li2S precipitation. Herein, the hollow Co x Fe3–x O4 heterostructure nanocages with highly interconnected pore architecture obtained by a PBA-assisted strategy are synthesized to overcome the abovementioned obstructions of LSBs. It is found that the bimetallic oxide-based heterostructure can not only inhibit LiPS diffusion via forming metal–sulfur bonds but also accelerate the LiPS conversion kinetics. Meanwhile, the hollow porous structure contributes to the physical confinement of LiPSs and acts as a buffer for the volume change. Thereby, the rate capability and cycling stability of hollow Co x Fe3–x O4@S composite electrodes have been improved significantly. As a result, the hollow Co x Fe3–x O4@S cell displays an excellent initial capacity of 1301.6 mAh g–1 at a current density of 200 mA g–1. Even at 1 A g–1, it exhibits an outstanding initial capacity of 898.9 mAh g–1 with a negligible capacity loss rate, which is only 0.106% per cycle after 500 cycles. This work provides a new perspective for the construction and design of multifunctional hollow heterostructure materials for more efficient and stable LSBs.

Novel Electrochemiluminescent Immunosensor Using Dual Amplified Signals from a CoFe Prussian Blue Analogue and Au Nanoparticle for the Detection of Lp-PLA2

“…Powder XRD was used to analyze the crystal structure of the CoFe PBA and AuNPs@CoFe PBA nanocomposite. The XRD pattern (Figure E) of the CoFe PBA shows a series of characteristic peaks at 17.17, 24.44, 34.80, 39.07, 42.95, 50.06, 53.22, 56.35, 65.21, and 67.95°, in agreement with the peaks reported in the literature, indicating the successful preparation of the CoFe PBA. In the XRD pattern of the AuNPs@CoFe PBA nanocomposite, in addition to the peaks of the CoFe PBA, four new characteristic diffraction peaks corresponding to gold can be observed at 38.10, 44.24, 64.72, and 77.69°, verifying the presence of AuNPs.…”

Electrochemical energy storage and conversion: An overview

“…All the recent reports on Li-sulfur systems pertaining the interconnected conductive carbon architectures, high sulfur loading, polysulfide confinement to prevent polysulfide shutteling effect, surface coating on the separators, biomimetic membrance for high rate performances are well documented in detail (Yu et al, 2020;M. Zhao et al, 2020;Y. Chen et al, 2021;Pender et al, 2020;Tricoli et al, 2020;M.…”

“…The improved cycling performance of FSME is mainly attributed to (i) accommodation of large amount of active materials, (ii) buffering volume change of the active material during cycling, and (iii) chemical binding of polar MnO 2 with lithium polysulfide. All the recent reports on Li‐sulfur systems pertaining the interconnected conductive carbon architectures, high sulfur loading, polysulfide confinement to prevent polysulfide shutteling effect, surface coating on the separators, biomimetic membrance for high rate performances are well documented in detail (Yu et al, 2020; M. Zhao et al, 2020; Y. Chen et al, 2021; J. Li et al, 2021; Pender et al, 2020; Tricoli et al, 2020; M. Wang et al, 2022).…”

A strontium ferrite modified separator for adsorption and catalytic conversion of polysulfides for excellent lithium–sulfur batteries

“…30 In addition, bi-metallic oxides have more active sites and stronger interactions with LiPSs than monometallic oxides by virtue of the favorable synergistic effect of hybridized orbitals and multiple elements. 31,32 Based on the foregoing, modifying the separator with bimetallic oxides and carbon materials is a potential strategy for improving electrochemical performance. 33,34 Herein, SrFe 12 O 19 (FSO) nanoparticles were successfully prepared by hydrothermal and calcination methods and then incorporated with acetylene black (AB) to modify PP separators by a simple coating method (Fig.…”