%0 Journal Article
%T Ultra-Long Cycle Life Aqueous Zinc-Ion Battery Optimized by V<sub>2</sub>O<sub>5</sub>@PDA Carbon Regulation Strategy
%A Tao Li
%J Journal of Power and Energy Engineering
%P 95-106
%@ 2327-5901
%D 2025
%I Scientific Research Publishing
%R 10.4236/jpee.2025.136006
%X Aqueous zinc-ion batteries (AZIBs), with the merits of low cost and inherent safety, emerge as promising green energy storage devices. Vanadium pentoxide (V<sub>2</sub>O<sub>5</sub>) as a classic AZIB cathode demonstrates superior redox activity and high capacity yet suffers from dual limitations of poor intrinsic conductivity and structural collapse caused by vanadium dissolution during charge/discharge cycles. To address these issues, we propose a surface modification strategy through hydrothermal polymerization of dopamine hydrochloride (PDA) with V<sub>2</sub>O<sub>5</sub> followed by controlled atmosphere annealing, constructing carbon-coated V<sub>2</sub>O<sub>5</sub>@PDA spheres. The PDA-derived N-doped carbon coating orchestrates three synergistic effects: (1) Compensating low intrinsic conductivity of V<sub>2</sub>O<sub>5</sub> by forming electron-conductive networks with enhanced charge transfer capability. (2) Engineering spherical architectures with enlarged specific surface area to expose abundant Zn<sup>2+</sup> storage sites, while creating ion diffusion pathways that reduce ionic transport resistance within V<sub>2</sub>O<sub>5</sub> matrix (activation energy: 0.67 eV vs. 1.12 eV pristine), and (3) Establishing conformal carbon encapsulation (thickness: 8.5 nm) to mechanically stabilize the structure against dissolution-induced collapse. The optimized composite delivers a high reversible capacity of 410.47 mAh g<sup>&#8722;</sup><sup>1</sup> at 0.1 A g<sup>&#8722;</sup><sup>1</sup> and sustains 62.18% capacity retention after 1000 cycles at 1 A g<sup>&#8722;</sup><sup>1</sup>, validating the effectiveness of this surface engineering approach. Mechanistic analysis confirms the carbon coating acts as a dual-functional interface that concurrently enhances electronic connectivity and dissolution resistance, providing a materials design blueprint for high-durability AZIBs cathodes.
%K AZIBs
%K Vanadium Dissolution
%K Carbon Coating
%K V<sub>2</sub>O<sub>5</sub>@PDA
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=143653