Structural Factors and Electrochemical Behaviors of 3D Architected Carbon Electrodes

摘要

Cycling of lithium-ion batteries composed of intercalation materials and electrolyte involves interfacial reactions and transports, governed by differences in ion concentrations, currents, and potentials. Those electrochemical behaviors have been investigated by characterizing simplified electrode structure such as thin film and single particle, and bridging the knowledge toward commercial batteries with modeling and simulations. However, the stochastic structure of slurry electrodes commonly used in commercial batteries makes it hard to investigate local environments in the battery system and understand relations between electrochemical factors and resulting phenomena such as solid electrolyte interface formation and lithium dendrite formations at local sites. Here, we address this challenge by developing deterministic 3D architected carbon electrode with micron-to-centimeter form factors and mechanical integrity, which enables us to prescribe the electrode architecture with the consideration of distribution of ion concentrations, currents and potentials and investigate electrochemical responses in battery operation and then conduct post-characterization of the electrode.