Journal Article lithium-ion batteries flexible electronics supercapacitors 3D supercapacitors Li-ion batteries LiPF6‐based electrolyte Pt single atoms and Au25 nanoclusters TiO2(B) nanotube anode aerobic-annealing bacterial cellulose black phosphorus cathode materials conductive polymers deshielding anions dielectric polarization dual-ion batteries dual‐site catalyst electrochemical catalysis electrochemistry energy density energy storage expandable honeycomb structures fire tolerance flame retardancy flexibility guest ions high metal loading amount and stability hygroscopic materials identification of body features