Chrysanthemum-like Polyaniline-Anchored PANI_0.22·V₂O₅·0.88H₂O-Hybridized Cathode for High-Stable Aqueous Zinc-Ion Batteries

Abstract

Based on the charge intercalation mechanism, an optimized regulation of the interlayer spacing and micromorphology is crucial to achieving promoted Zn2+ storage performance for the affordable layered vanadium oxides. Herein, an original chrysanthemum-like organic conductive polyaniline (PANI) intercalated hybridized cathode (PANI0.22·V2O5·0.88H2O) is developed by preintercalation of the aniline monomer and subsequently in situ polymerization within the oxide interlayers. Profiting from the “pillars” effects as well as the unique π-conjugated structure of PANI, the electrostatic interactions between the Zn2+ and the V–O layer can be effectively weakened. More importantly, the conjugated conductive guest polymer could inherently induce electron transfer to lower the valence of vanadium, which is beneficial for enhancing electronic conductivity. Moreover, the 3D micromorphology guarantees abundant active sites for Zn2+ transfer and intimate contact with electrolytes. Accordingly, the chrysanthemum-like PANI-intercalated V2O5 exhibits a high specific capacity of 447 mA h g–1 at 0.1 A g–1 and state-of-the-art cycling stability at 92% capacity retention after 3000 cycles. Also, the meticulous charge storage mechanism of this hybrid cathode is investigated systematically through a series of in-depth analyses. Our findings provide a pathway for tuning the interlayer spacing and microstructure toward advanced multivalent ion storage applications.

Enhancing Aqueous Zinc-Ion Battery Performance through Structural Modification of Hydrated Vanadate with Lanthanum

“…The broad layered structure, which favors cation transport, and the structural water molecules, which effectively shield the electrostatic interactions between trivalent cations and the host framework, are credited with the good kinetics of the VOH cathode. By altering different hydrated vanadate deposition conditions, many studies have documented an increase in D Zn +2 of the hydrated vanadate. − Hydrated vanadates, the targeted materials in these studies, emerge as valuable byproducts and serve as highly beneficial electrode materials for batteries that utilize zinc ions as a power source.…”

Optimizing ammonium vanadate crystal structure by facile in situ phase transformation of VO2/NH4V4O10 with special micro–nano feature for advanced aqueous zinc ion batteries

“…Meanwhile, compared to previously reported V-based cathode materials in Table S2, † the VO 2 /NVO3 composite material still displays comparable Zn 2+ migration speed, enabling excellent rate performance. [55][56][57]…”