Journal Article in situ TEM EGaIn@C nanoparticles LiH Research Support, Non-U.S. Gov't Review all‐solid‐state lithium‐sulfur batteries batteries conduction mechanism core-shell structures electrochemical‐mechanical failure electron and ion transport fuel cells hierarchical carbon nanocages hierarchical structure RGO@EGaIn high-rate performance inorganic components liquid metal alkali-ion batteries liquid metal batteries lithium-ion batteries multi‐dimensional structural engineering niobium pentoxide anodes operando X-ray diffraction operando transmission electron microscopy self-healing self‐decomposition self‐healing solar cells solid‐electrolyte interphase transmission electron microscopy