Dual-ligand zinc metal organic frameworks-derived solid-electrolyte interphase for stable zinc anode in aqueous electrolytes

Abstract

Rechargeable aqueous zinc-ion batteries (ZIBs) have attracted attention for energy storage systems because of their high specific capacity, low cost, and safety. However, in mildly acidic aqueous electrolytes, several issues of zinc anodes such as dendrite formation, and corrosion, limit the practical deployment and performance of ZIBs. Metal-organic frameworks (MOFs) is ultrahigh porosity and high internal surface areas. MOFs layer as the solid-electrolyte interphase layer to prevent the zinc anode from attaching directly to the separator. MOFs is used in batteries as the SEI layer because the pores of MOFs efficiently facilitate the diffusion and transport of zinc-ions. In this work, MOFs having zinc as a metal ion and imidazole and 1,3,5-benzenecarboxylic acid ligands were synthesized and pyrolyzed at various temperatures for ZIBs applications. The results shows that the MOFs-coated anodes prevented the anodes and almost no change in corrosion. The impedance and ionic conductivity of zinc anode was lowered by MOFs and MOFs-X more than by bare zinc. The long-term cycle battery test of Zn-BTC-Imidazole (MOFs-500°C) can improve the uniformity of zinc deposition over the anode surface leading to higher cycling stability of more than 600 hours and extending the battery's life when compared with bare zinc anode and other works.