Cu x O as an ultra‐stable voltage plateaus and long‐life cathode material in aqueous ammonium‐ion batteries

Abstract Aqueous ammonium batteries (AAIBs) gain extensive attention because of their merits, such as cost‐effectiveness, eco‐friendliness, and safety. Nevertheless, the limited research on electrode materials impedes their further development. Here, we prepare Cu x O ( x = 1, 2) materials and apply them as cathode materials for AAIBs. The electrodes have a high discharge‐specific capacity and a long and stable charge–discharge plateau. In accordance with density functional theory, the mechanism of NH 4 + storage involves the reversible formation and breaking of hydrogen bonds. Simultaneously, CuO contributes additional electrons and facilitates the rearrangement of internal electrons, thereby enhancing the…

• NN
  National Natural Science Foundation of China

  Awards: 52371211, 52171200
• NS
  Natural Science Foundation of Shandong Province

  Award: ZR2024QB185