Reunderstanding the Reaction Mechanism of Aqueous Zn–Mn Batteries with Sulfate Electrolytes: Role of the Zinc Sulfate Hydroxide

Abstract Rechargeable aqueous Zn–Mn batteries have garnered extensive attention for next‐generation high‐safety energy storage. However, the charge‐storage chemistry of Zn–Mn batteries remains controversial. Prevailing mechanisms include conversion reaction and cation (de)intercalation in mild acid or neutral electrolytes, and a MnO 2 /Mn 2+ dissolution−deposition reaction in strong acidic electrolytes. Herein, a Zn 4 SO 4 ·(OH) 6 · x H 2 O (ZSH)‐assisted deposition−dissolution model is proposed to elucidate the reaction mechanism and capacity origin in Zn–Mn batteries based on mild acidic sulfate electrolytes. In this new model, the reversible capacity originates from a reversible conversion reaction between…

• NN
  National Natural Science Foundation of China

  Awards: 21972111, 22179109
• NS
  Natural Science Foundation of Chongqing

  Award: cstc2018jcyjAX0714