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Role of a Solid–Electrolyte Interphase in the Dendritic Electrodeposition of Lithium: A Brownian Dynamics Simulation Study

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journal contribution
posted on 20.04.2020, 19:14 by Kisang Byun, Joyanta K. Saha, Joonkyung Jang
A robust, flexible, and uniform layer of solid-electrolyte interphase (SEI) is known to regulate the dendritic growth of a lithium metal anode during electrodeposition. The underlying mechanism and extent of such regulation are largely unknown. The present Brownian dynamics simulation elucidates the suppressive role of a SEI layer in the dendritic electrodeposition. By thinning out a SEI layer to a subnanometer scale, a dendrite with long arms becomes dense and mossy, and it grows much slower in time. The radial diffusion of lithium ions through a thin SEI layer gives an isotropic growth of a round tip, instead of a dendritic ramification along a particular direction.