Benchmarking Corrosion with Anionic Polarity Index for Stable and Fast Aqueous Batteries Even in Low‐Concentration Electrolyte

Abstract Despite aqueous electrolyte endowing batteries with the merits of safe operation, low‐cost fabrication, and high ionic conductivity, water‐induced corrosion, including spontaneous chemical and electrochemical hydrogen evolution corrosion, adversely affects lifespan and rate capability. There is still a lack of selection criteria for benchmarking corrosion behavior qualitatively. Through theoretical simulation, an anionic polarity index (API) tactic is proposed to resist corrosion by manipulating interfacial and solvated water concomitantly, thus realizing stable and fast Zn aqueous batteries (ZABs). As proof of concept, a low‐cost zinc salt of 0.5 m zinc bis(4‐hydroxybenzenesulphonate) (Zn(HBS) 2 )…

• NS
  Natural Science Foundation of Shanghai

  Award: 22ZR1403600
• NN
  National Natural Science Foundation of China

  Awards: 22088101, 22309031, U24A2060, 22279023
• SA
  Science and Technology Commission of Shanghai Municipality

  Award: 2024ZDSYS02
• NK
  National Key Research and Development Program of China

  Awards: 2022YFA1503501, 2024YFE0101100