Journal Article Research Support, Non-U.S. Gov't flexible devices lithium-ion batteries polymers Aniline Compounds Gases Nanotubes, Carbon SWNT activated carbon all-in-one devices binder-free cathodes carbon nanotube films carbon nanotubes chemical hydrogel films conducting polymers elemental design flexible batteries flexible cathodes flexible electrodes layered oxide cathodes lithium borate lithium-ion capacitors micro-supercapacitors nitrogen-doped hierarchical carbon polyaniline prelithiation agent self-propagating high-temperature synthesis silicon‐based LIBs single crystals