In the first five cycles, a clear trend emerges that the thickness of the graphite electrode at the fully potassiated state gradually decreases, while, conversely, it gradually increases at the fully depotassiated state.
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Revisiting potassium intercalation in graphite: an <i>operando</i> characterisation and computational approach.
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The sentences
The analysis revealed a decreasing trend in F-containing species from the surface to the inner phase of the SEI until it reaches a plateau.