Three-to-One Dimensional Crossover of Growth Mode in Transition Metal Cyanide Film

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Abstract

<jats:p> A thin film of a transition metal cyanide is a promising positive electrode material for a Li ion secondary battery. Here, we investigated the surface morphologies of Na<jats:sub>1.60</jats:sub>Co[Fe(CN)<jats:sub>6</jats:sub>]<jats:sub>0.90</jats:sub>2.9H<jats:sub>2</jats:sub>O by atomic force microscopy (AFM) and scanning electron microscopy (SEM) against film thickness (<jats:italic>t</jats:italic>). We observed a crossover behavior of the growth mode from the three-dimensional (3D) type to the one-dimensional (1D) type at the threshold thickness (<jats:italic>t</jats:italic> <jats:sub>th</jats:sub> ≈250 nm). We found that the growth mode is governed by the intradomain grain coverage (γ<jats:sub>D</jats:sub>), not by the conventional surface coverage (γ). </jats:p>

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