Toward High-Energy-Density Aqueous Zinc–Iodine Batteries: Multielectron Pathways

Aqueous zinc–iodine batteries (ZIBs) based on the reversible conversion between various iodine species have garnered global attention due to their advantages of fast redox kinetics, good reversibility, and multielectron conversion feasibility. Although significant progress has been achieved in ZIBs with the two-electron I–/I2 pathway (2eZIBs), their relatively low energy density has hindered practical application. Recently, ZIBs with four-electron I–/I2/I+ electrochemistry (4eZIBs) have shown a significant improvement in energy density. Nonetheless, the practical use of 4eZIBs is challenged by poor redox reversibility due to polyiodide shuttling during I–/I2 conversion and I+ hydrolysis during I2/I+…

• AI
  Australian Institute of Nuclear Science and Engineering
• AR
  Australian Research Council

  Awards: CE230100032, DP220102596, IL230100039, DE230100471