Unraveling\nthe Deposition and Dissolution Behavior\nof the Ag-Modified Li Surface Based on Electrochemical Atomic Force\nMicroscopy

Lithium is a promising\nanode material for advanced batteries because\nof its high capacity and low redox potential. However, its practical\nuse is hindered by nonuniform Li deposition and dendrite formation,\nleading to safety concerns in Li metal batteries. Our study shows\nthat Ag-based materials enhance the uniformity of Li deposition on\nAg-modified Li (AgLi) surfaces, thereby addressing these key challenges.\nThis improvement is due to the strong affinity of Ag for Li, which\npromotes uniform deposition and dissolution. Additionally, the AgLi\nsurface demonstrated an improved cycling stability, which is crucial\nfor long-term battery reliability. Emphasizing our analytical approach,\nwe utilized comprehensive techniques such as Kelvin probe force microscopy\n(KPFM) and electrochemical atomic force microscopy (EC-AFM) to locally\nanalyze the electrical properties and unravel the Li deposition/dissolution\nmechanisms. KPFM analysis provided crucial insights into surface potential\nvariations, while EC-AFM highlighted topographical changes during\nthe Li deposition and dissolution processes, contributing significantly\nto the development of safer and more efficient Li metal batteries.