Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 10, 2025

Abstract Microparticle cathode materials are widely used in secondary batteries. However, obtaining dynamic chemical heterogeneities of these microparticles is challenging, hindering in‐depth mechanistic investigation the underlying processes. For example, although vanadium pentoxide shows promise as an electrode material for zinc ion batteries, its poor performance's root cause elusive. Herein, a fluorescence/scattering dual‐mode spinning disk confocal microscopy‐based approach developed to visualize 4D heterogeneity single V 2 O 5 particles during cycling. Dual‐mode situ imaging identifies valence state changes ions with high spatiotemporal resolution. A unique difference observed between scattering intensities particle's bottom electric contact points and rest parts discharging process. In contrast, fluorescence intensity variation suggests consistency across particles. Correlative Raman, UV–Vis spectroscopy, electrochemical impedance spectroscopy analyses suggest precipitation 3+ species at interface electrode, leading increased electron transfer resistance compromised overall performance. coordination strategy ethylene diamine tetraacetic acid proposed inhibiting precipitation, effectiveness further verified by analyses. Insights from presented herein will enable rational design high‐performance

Language: Английский