Polyaniline Encapsulated Amorphous V₂O₅ Nanowire‐Modified Multi‐Functional Separators for Lithium–Sulfur Batteries

Abstract

Designing multi‐functional separators is one of the effective strategies for achieving high‐performance lithium–sulfur (Li–S) batteries. In this work, polyaniline (PANI) encapsulated amorphous vanadium pentoxide (V2O5) nanowires (general formula V2O5·nH2O and abbreviated as VOH) are synthesized by a facile in situ chemical oxidative polymerization method, and utilized as a basic building block for the preparation of functional interlayers on the commercial polypropylene (PP) separator, generating a VOH@PANI‐PP separator with multi‐functionalities. Compared to the crystalline V2O5, the amorphous V2O5 shows enhanced properties of polysulfide adsorption, catalytic activity, as well as ionic conductivity. Therefore, within the VOH@PANI‐PP separator, the amorphous V2O5 nanowire component contributes to the strong adsorption of polysulfides, the high catalytic activity for polysulfides conversion, and the high ionic conductivity. The PANI component further strengthens the above effects, improves the electrical conductivity, and enhances the flexibility of the modified separator. Benefiting from the synergistic effects, the VOH@PANI‐PP separator effectively suppresses polysulfide shuttling and improves the cycling stability of its composed Li–S batteries. This work provides a new research strategy for the development of efficient separators in rechargeable batteries by judiciously integrating the amorphous metal oxide with a conductive polymer.

White Light Generating Molecular Materials: Correlation Between the Amorphous/Crystalline Structure and Nonlinear Optical Properties

“…[1][2][3] Examples for recent developments include supercapacitors, electrolytic water splitting, and battery materials. [4][5][6] The amorphous materials show widely superior properties compared to their crystalline counterparts in their respective applications. The key for understanding and enhancing any desirable features, in general, is understanding the microscopic structure, or rather, the absence thereof in such materials.…”

“…Applications range from amorphous silicon in photovoltaics to metal‐based amorphous alloys for data storage or highly elastic metallic glasses [1–3] . Examples for recent developments include supercapacitors, electrolytic water splitting, and battery materials [4–6] . The amorphous materials show widely superior properties compared to their crystalline counterparts in their respective applications.…”

s‐MoO3/MoO2@C Hollow Tubes as Polysulfide‐Filter for Lithium‐Sulfur Batteries

“…The WO 3 nanowires interact with PS through thiosulfate mediator to retain PS near the cathode‐side, improving the reaction kinetics. Similarly, Chen et al [8] . utilized amorphous V 2 O 5 nanowires as the interlayer in Li−S battery, which also verifies the connection between thiosulfate and catalytic performance.…”

Suppressing Glass‐Transition and Lithium‐Ions Migration in Hole Transport Layer by V2O5 Decorated Graphite Carbon Nitride Nanosheets for Thermally Stable Perovskite Solar Cells

“…The corresponding N 1s spectra of CNV2 slightly shifted to the high binding energy compared with that in CN nanosheets (Figure 1g), while the corresponding V 2p spectra in CNV2 shifted to the low binding energy compared with the pure V 2 O 5 (Figure 1h), indicating the interaction and the electron transfer between the V 2 O 5 and CN nanosheets. [ 15 ] In conclusion, we successfully prepared the CNV2 with uniformly dispersed V 2 O 5 nanoparticles through the interaction between the CN nanosheets and V 2 O 5 . The electrochemical redox potentials of the CNV2 nanosheets were verified by cyclic voltammetry (CV) and determined as 0.428 V versus Fc/Fc + (Figure S2, Supporting Information).…”