Journal Article Research Support, Non-U.S. Gov't computed tomography limited-angle 3D fabrication Fluorescent Dyes X-ray phase contrast X-ray polarization calcium batteries calcium electrolyte calcium metal anode correlative imaging method cryogenic fluorescence microscopy cryogenic soft X-ray tomography current collector differential phase-contrast imaging direct information retrieval method discrete algebraic reconstruction technique (DART) equally sloped tomography few-view flexible resist stencils grating-based phase-contrast imaging image reconstruction limited-angle range metallic spirals metastructures missing wedge modified discrete algebraic reconstruction technique (MDART) multiple grey image noisy data