Fig. 4: Structural evolution of KTiPO4F during deintercalation.
From: Titanium-based potassium-ion battery positive electrode with extraordinarily high redox potential
a Magnified regions of the in operando SXPD intensity map: phase transformations. White and black dashed lines designate reflections related to particular phases. 2P—two-phase region, SS—solid-solution region. Vertical dashed lines show tentative borders of 2P and SS regions. b Cell volume evolution on charge as refined from in operando SXPD data for KxTiPO4F with related charge galvanostatic curve. c dQ/dE plot showing potential ranges for solid-solution and multiple two-phase deintercalation regions.
