Used experimental and theoretical methods refer to:

• material synthesis,
• crystal structure determination (FIB preparation of single crystals, crystal orientation determination, X-ray spectroscopy, X-ray single crystal diffraction, electron density determination, N-dimensional crystallography, maximum entropy method),
• electrochemical characterization (glovebox preparation, impedance spectroscopy, tubandt method, cyclo-voltammetry, battery cycling),
• application of theoretical methods of crystallography, crystal chemistry, and crystal physics (topological methods, e.g. Voronoi-Dirichlet partitioning in ToposPro, bond-valence methods and structural modeling by means of density functional theory) and
• data/knowledge mining and machine learning (e.g. Battery Materials Project).