Journal Article Br−/Br3− redox Li-S batteries NCM811 PET upcycling all‐solid–state lithium metal batteries boron-rich interphase capacity restoration composite electrolyte additives cycling stability dead lithium dendrite free fast charging fast-charging batteries formate functional protective electrolyte gradient component design high current densities high energy density high power density high sulfur loading high-loading cathodes homogeneous catalysis liquid metal lithium dendrite lithium‐ion batteries lithium–sulfur batteries macrocyclic cooper complexes molecular sieve nickel‐rich layered oxide cathode