Equation 11 · How Materials Discovery and Degradation Actually Work
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the initial thickness. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.
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subscript
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What the article says around this equation
where is film thickness, an initial thickness, and k a rate constant set by species diffusivity through the existing film — a direct consequence of assuming the rate-limiting step is diffusion across a film whose own thickness is the barrier [ 2 ] . This is a model, not a universal law : the review is explicit that mixed kinetic-and-transport regimes, porous or cracked SEI, and side reactions all produce departures from a clean square-root trend, and reconciling model and experiment remains an open problem [ 2 ] .
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