Journal Article liquid metals Cryo‐EM K-ion batteries Li metal anodes Li-ion batteries Li-ion flux Li-rich alloys Na anode Na batteries Na-ion batteries Review alkali-ion batteries catholytes electrochemistry energy storage flexible batteries fusible alloys high-energy-density holey nanosheets hybrid-cation batteries interfacial chemistry ion redistributors metal electrodes organic electrodes organic redox flow batteries phenothiazine potassium-ion batteries room temperature smart grid