# Interface engineering V2O5@PANI nanotube for high-performance aqueous zinc-ion batteries

## TL;DR

Researchers improved zinc-ion batteries by creating a stable nanotube structure that boosts energy storage and lasts longer.

## Contribution

A core-shell V2O5@PANI nanotube design is introduced to enhance Zn2+ diffusion and battery performance.

## Key findings

- The composite achieved 462.4 mAh g−1 capacity at 0.5 A g−1.
- 96.5% capacity retention was observed over 500 cycles.
- PANI coating improved conductivity and structural stability.

## Abstract

Aqueous Zn-ion batteries offer safe and cost-effective energy storage, yet their energy density requires improvement. While vanadium pentoxide (V2O5) possesses attractive redox activity, its practical implementation is hindered by structural instability and limited cycling performance. Core-shell V2O5@PANI nanotubes are fabricated via in situ polymerization to enhance Zn2+ diffusion and structural resilience. This architecture facilitates interfacial charge transfer and stabilizes the host framework during cycling. The optimized cathode achieves a high capacity of 462.4 mAh g−1 at 0.5 A g−1 with 96.5% capacity retention over 500 cycles. This work demonstrates a synergistic combination of nanostructural control and interfacial engineering, providing a generalizable materials design strategy for advanced electrochemical energy storage systems.

•Core-shell V₂O₅@PANI nanotube fabricated via in situ oxidative polymerization•PANI coating expands interlayer spacing, enhances conductivity, and stabilizes framework•Composite delivers 462.4 mAh g−1 capacity with 96.5% retention over 500 cycles

Core-shell V₂O₅@PANI nanotube fabricated via in situ oxidative polymerization

PANI coating expands interlayer spacing, enhances conductivity, and stabilizes framework

Composite delivers 462.4 mAh g−1 capacity with 96.5% retention over 500 cycles

Energy engineering; Energy systems; Energy storage