Electrochemically Active Red P/BaTiO3‐Based Protective Layers Suppressing Li Dendrite Growth for Li Metal Batteries

Abstract Li metal has been considered a promising anode for high‐energy density batteries because of its high specific capacity. However, uncontrolled Li dendrite growth and severe electrolyte decomposition are detrimental obstacles hindering the practical applications of lithium metal batteries. Herein, electrochemically active red P‐based protective layers are introduced to suppress Li dendrite growth during cycling. Red P particles confined in the protective layer react with Li dendrites, forming Li3P, as Li dendrites are penetrating through the protective layer. As a result, Li metal is no longer plated on the Li3P surface because Li3P is electrically insulating, eventually leading to suppressing Li dendrite growth. Moreover, the red P‐based protective layer is functionalized with dielectric BaTiO3 nanoparticles to scavenge radicals generated from electrolyte decomposition as well as…