期刊
CHEMISTRY OF MATERIALS
卷 34, 期 1, 页码 325-336出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c03656
关键词
-
资金
- U.S. Department of Energy [DE-AC02-06CH11357]
- Ecole Normale Superieure Paris-Saclay
- European Research Council (ERC) (FP/2014)/ERC [670116-ARPEMA]
- [ANR-10-EQPX-45]
Researchers chemically designed two new LixIrS2 polymorphs to investigate the mechanisms of ligand redox processes in lithium-ion batteries, finding that the electrochemical processes involved different sulfur redox couples. These insights into the structural and anionic redox systems hysteresis origins can guide the design of new practical electrode materials.
Li-ion batteries are growing in demand and such growth calls for the quest for high-energy-density electrode materials. Li-rich layered oxides that show both cationic and anionic redox are expected to meet the high energy requirement. However, the oxygen anion activity triggers numerous structural and electronic rearrangements that need to be understood prior to envisioning applications. Here, we chemically design two new LixIrS2 polymorphs to further interrogate the mechanisms of the ligand redox process. By combined structural and spectroscopic characterizations, we show that electrochemical lithiation/delithiation of the polymorphs involve different sulfur redox couples that stand as unusual behavior. These structure-dependent kinetic pathways lead to an similar to 1 V difference between the two polymorphs, hence providing the missing link between the structure and hysteresis in anionic redox systems. These insights into the origin of hysteresis can guide proper parameters to cure it, hence laying the groundwork for the design of new practical electrode materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据