Perovskite Cathodes for Aqueous and Organic Iodine Batteries Operating Under One and Two Electrons Redox Modes.
basic_science · Level V
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- Record sourced from PubMed, PMID 37587645.
- Also identified by DOI 10.1002/adma.202304557.
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Abstract
Although conversion-type iodine-based batteries are considered promising for energy storage systems, stable electrode materials are scarce, especially for high-performance multi-electron reactions. The use of tin-based iodine-rich 2D Dion-Jacobson (DJ) ODASnI<sub>4</sub> (ODA: 1,8-octanediamine) perovskite materials as cathode materials for iodine-based batteries is suggested. As a proof of concept, organic lithium-perovskite and aqueous zinc-perovskite batteries are fabricated and they can be operated based on the conventional one-electron and advanced two-electron transfer modes. The active elemental iodine in the perovskite cathode provides capacity through a reversible I<sup>-</sup> /I<sup>+</sup> redox pair conversion at full depth, and the rapid electron injection/extraction leads to excellent reaction kinetics. Consequently, high discharge plateaus (1.71 V vs Zn<sup>2+</sup> /Zn; 3.41 V vs Li<sup>+</sup> /Li), large capacity (421 mAh g<sup>-1</sup> <sub>I</sub> ), and a low decay rate (1.74 mV mAh<sup>-1</sup> g<sup>-1</sup> <sub>I</sub> ) are achieved for lithium and zinc ion batteries, respectively. This study demonstrates the promising potential of perovskite materials for high-performance metal-iodine batteries. Their reactions based on the two-electron transfer mechanism shed light on similar battery systems aiming for decent operational stability and high energy density.