Two-Electron Redox Chemistry Enabled High-Performance Iodide-Ion Conversion Battery

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Article numbere202113576
Journal / PublicationAngewandte Chemie - International Edition
Issue number9
Online published21 Dec 2021
Publication statusPublished - 21 Feb 2022


A single-electron transfer mode coupled with the shuttle behavior of organic iodine batteries results in insufficient capacity, a low redox potential, and poor cycle durability. Sluggish kinetics are well known in conventional lithium–iodine (Li−I) batteries, inferior to other conversion congeners. Herein, we demonstrate new two-electron redox chemistry of I/I+ with inter-halogen cooperation based on a developed haloid cathode. The new iodide-ion conversion battery exhibits a state-of-art capacity of 408 mAh gI−1 with fast redox kinetics and superior cycle stability. Equipped with a newly emerged 3.42 V discharge voltage plateau, a recorded high energy density of 1324 Wh kgI−1 is achieved. Such robust redox chemistry is temperature-insensitive and operates efficiently at −30 °C. With systematic theoretical calculations and experimental characterizations, the formation of Cl−I+ species and their functions are clarified.

Research Area(s)

  • DFT calculations, haloid cathode, iodide-ion conversion, temperature-insensitive, two-electron redox, RECHARGEABLE LITHIUM, STORAGE, STABILITY