Zero-strain reductive intercalation in a molecular framework
J A Hill, A B Cairns, J J K Lim, S J Cassidy, S J Clarke, and A L Goodwin
Cryst Eng Comm 17, 2925-2928 (2015)

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Reductive intercalation of potassium within the molecular framework Ag3[Fe(CN)6] gives rise to a volume strain that is an order of magnitude smaller than is typical for common ion-storage materials. We suggest that framework flexibility might be exploited as a general strategy for reducing cycling strain in battery and ion-storage materials.