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标题:Proton Ion Exchange Reaction in Li3 IrO4 : A Way to New H3+ x IrO4 Phases Electrochemically Active in Both Aqueous and Nonaqueous Electrolytes
时间:2020-03-26 19:54:47
DOI:10.1002/aenm.201702855
作者:Arnaud J. Perez;Robin Beer;Zifeng Lin
关键词:batteries;layered oxides;protons;pseudocapacitors
出版源: 《Advanced Energy Materials》 ,2018
摘要:Progress over the past decade in Li-insertion compounds has led to a new class of Li-rich layered oxide electrodes cumulating both cationic and anionic redox processes. Pertaining to this new class of materials are the Li/Na iridate phases, which present a rich crystal chemistry. This work reports on a new protonic iridate phase H 3+ x IrO 4 having a layered structure obtained by room temperature acid-leaching of Li 3 IrO 4 . This new phase shows reversible charge storage properties of 1.5 e − per Ir atom with high rate capabilities in both nonaqueous (vs Li + /Li) and aqueous (vs capacitive carbon) media. It is demonstrated that Li-insertion in carbonate LiPF 6 -based electrolyte occurs through a classical reduction process (Ir 5+ ↔ Ir 3+ ), which is accompanied by a well-defined structural transition. In concentrated H 2 SO 4 electrolyte, this work provides evidence that the overall capacity of 1.7 H + per Ir results from two additive redox processes with the low potential one showing ohmic limitations. Altogether, the room temperature protonation approach, which can be generalized to various Li-rich phases containing either 3d, 4d or 5d metals, offers great opportunities for the judicious design of attractive electrode materials.
大小:5655 kb
页数:12 PAGES
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