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

作者：Li, Xinliang; Wang, Yanlei; Chen, Ze; Li, Pei; Liang, Guojin; Huang, Zhaodong; Yang, Qi; Chen, Ao; Cui, Huilin; Dong, Binbin; He, Hongyan^*; Zhi, Chunyi^*

来源：Angewandte Chemie - International Edition, 2022, 61(9): e202113576.

DOI：10.1002/anie.202113576

• DFT calculations
• haloid cathode
• iodide-ion conversion
• temperature-insensitive
• two-electron redox

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 degrees C. With systematic theoretical calculations and experimental characterizations, the formation of Cl-I+ species and their functions are clarified.

• 单位
  郑州大学; 中国科学院