期刊
ADVANCED MATERIALS
卷 32, 期 38, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004240
关键词
aqueous zinc-iodide batteries; electrolyte solvation regulation; metal-organic frameworks; triiodide; iodide redox couple; zinc electrodeposits
类别
资金
- National Key Research and Development Program of China [2016YFB0100203]
- National Natural Science Foundation (NSF) of China [21673166, 21633003, u1801252]
- China Scholarship Council (CSC)
The introduction of the redox couple of triiodide/iodide (I-3(-)/I-) into aqueous rechargeable zinc batteries is a promising energy-storage resource owing to its safety and cost-effectiveness. Nevertheless, the limited lifespan of zinc-iodine (Zn-I-2) batteries is currently far from satisfactory owing to the uncontrolled shuttling of triiodide and unfavorable side-reactions on the Zn anode. Herein, space-resolution Raman and micro-IR spectroscopies reveal that the Zn anode suffers from corrosion induced by both water and iodine species. Then, a metal-organic framework (MOF) is exploited as an ionic sieve membrane to simultaneously resolve these problems for Zn-I(2)batteries. The multifunctional MOF membrane, first, suppresses the shuttling of I(3)(-)and restrains related parasitic side-reaction on the Zn anode. Furthermore, by regulating the electrolyte solvation structure, the MOF channels construct a unique electrolyte structure (more aggregative ion associations than in saturated electrolyte). With the concurrent improvement on both the iodine cathode and the Zn anode, Zn-I(2)batteries achieve an ultralong lifespan (>6000 cycles), high capacity retention (84.6%), and high reversibility (Coulombic efficiency: 99.65%). This work not only systematically reveals the parasitic influence of free water and iodine species to the Zn anode, but also provides an efficient strategy to develop long-life aqueous Zn-I(2)batteries.
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