期刊
ADVANCED FUNCTIONAL MATERIALS
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202304811
关键词
catalytic conversion; kinetics; self-discharge; shuttle effect; zinc-iodine batteries
A lithiation approach is reported for the iodine host in static zinc-iodine batteries, which suppresses the shuttle effect and catalyzes iodine conversion. This method improves self-discharge and kinetics by regulating the d- and p-band center and lowering the I-/I-0 conversion barrier. Zinc-iodine batteries featuring LiVS2 as the iodine host show high iodine utilization, high Coulombic efficiencies, and a long cyclic lifespan.
Aqueous static zinc-iodine batteries attract tremendous attention because of their abundant reserves of iodine, nonflammable electrolyte, and facile assembly. Currently, scientific challenges for static zinc-iodine batteries include self-discharge and sluggish kinetics. Herein, a lithiation approach for the iodine host to suppress the shuttle effect and catalyze iodine conversion is reported. Through regulating the d- and p-band center and lowering the I-/I-0 conversion barrier, Li+ intercalation into VS2 reinforces interaction with I-3(-) and achieves catalytic conversion of iodine, ameliorating self-discharge, and accelerating kinetics. Zinc-iodine batteries featuring LiVS2 as the iodine host reach a high iodine utilization, high Coulombic efficiencies, and a long cyclic lifespan. Notably, the performance enhancement mechanism is the thermodynamically favorable iodine conversion reaction, inhibition of the I-3(-) appearance, and promotion of I-3(-) consumption due to the Li+ insertion. The findings provide fundamental insights into tackling issues of static zinc-iodine batteries.
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