Li metal batteries and solid state batteries benefiting from halogen-based strategies

Li-metal batteries are re-arising as the promising next-generation battery system due to its potential high energy density, as long as the issue of Li dendrite growth can be effectively addressed. Solid state battery architecture is a potential solution to dendrite free anode. However its high performance is still hampered by the low Li-ion conductivity of solid electrolyte and transport limitation at interface. In this review, we summary the recent progresses on Li dendrite inhibition at the anode side and conductivity enhancement at the solid electrolyte side from the viewpoints of halogen-based strategies. The methods based on electrolyte additive and artificial coating layer on anode are especially effective to construct F-rich solid electrolyte interface. Large-sized halogen as ligand modifier enables desired mineral phases of high Li-ion conductivity.