Constructing static two-electron lithium-bromide battery

作者：Xinliang Li, Yanlei Wang, Junfeng Lu, Pei Li, Zhaodong Huang, Guojin Liang, Hongyan He, Chunyi Zhi · 发表于：Science Advances · 年份：2024 · DOI：10.1126/sciadv.adl0587 · 被引用次数：33 · 研究领域：Advanced battery technologies research、Advanced Battery Materials and Technologies、Covalent Organic Framework Applications

Despite their potential as conversion-type energy storage technologies, the performance of static lithium-bromide (SLB) batteries has remained stagnant for decades. Progress has been hindered by the intrinsic liquid-liquid redox mode and single-electron transfer of these batteries. Here, we developed a high-performance SLB battery based on the active bromine salt cathode and the two-electron transfer chemistry with a Br − /Br + redox couple by electrolyte tailoring. The introduction of NO 3 − improved the reversible single-electron transition of Br − , and more impressively, the coordinated Cl − anions activated the Br + conversion to provide an additional electron transfer. A voltage plateau was observed at 3.8 V, and the discharge capacity and energy density were increased by 142 and 159% compared to the one-electron reaction benchmark. This two-step conversion mechanism exhibited excellent stability, with the battery functioning for 1000 cycles. These performances already approach the state of the art of currently established Li-halogen batteries. We consider the established two-electron redox mechanism highly exemplary for diversified halogen batteries.