Synergetic Li-ion Storage Effects of Nanostructured V2O5–Modified Silicon Thin Film Anodes

Year 2025, Volume: 20 Issue: 2, 143 - 159, 26.11.2025

Elif Muslu Yılmaz , Ayşegül Öksüz , Esin Eren

Abstract

In this study, a nanostructured vanadium pentoxide (V₂O₅)-modified silicon (Si) thin film anode was successfully fabricated using radio frequency (RF) magnetron sputtering to enhance the electrochemical performance of Si-based thin film anodes for lithium-ion batteries (LIBs). Structural and morphological characterization confirmed the successful deposition of V2O5 interlayer modified Si thin film architecture with improved surface roughness and compositional uniformity. Electrochemical analyses revealed a synergistic effect between the high-capacity Si and the pseudocapacitive behavior of V₂O₅. Cyclic voltammetry (CV) and kinetic studies demonstrated a mixed charge storage mechanism, with both diffusion-controlled and capacitive contributions. The modified Si thin film anode delivered initial discharge capacity of ~2013 mAh/g, followed by a stable reversible capacity of 367 mAh/g over 180 cycles. These results suggest that V₂O₅ interlayer engineering offers a promising strategy to overcome the limitations of Si anodes and advance high-performance LIB systems.

Keywords

silicon , vanadium pentoxide , thin film anode , lithium-ion battery , interlayer engineering.

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