  We discover presence of chemical inductive effects in phase separating ion
intercalation energy storage materials, specifically in lithium iron phosphate
(LFP) and also lithium titanate oxide (LTO). These materials features fast
(de)intercalation and slow diffusion relaxation phenomena which are
prerequisites for observing such inductive effects. Presented finding is
supported by the mechanistic model and analytical reasoning indicating that all
equilibrium states that lay inside the miscibility gap of the phase separating
material exhibit strong inductive response in the low frequency part of
spectrum. We also explain why such inductive effects are not observed outside
the miscibility gap. This letter presents the first mechanistic reasoning of
previously reported electrode level experimental observation of inductance
during impedance measurements at low currents.

Materials Science