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132951 |
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|a dc
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|a Leverick, Graham M.
|e author
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|a Massachusetts Institute of Technology. Department of Mechanical Engineering
|e contributor
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|a Massachusetts Institute of Technology. Research Laboratory of Electronics
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|a Massachusetts Institute of Technology. Department of Materials Science and Engineering
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|a Tułodziecki, Michał
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|a Tatara, Ryoichi
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|a Bardé, Fanny
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|a Shao-Horn, Yang
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|a Solvent-Dependent Oxidizing Power of LiI Redox Couples for Li-O2 Batteries
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|b Elsevier BV,
|c 2021-10-13T17:36:36Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/132951
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|a Li-O₂ batteries offer higher gravimetric energy density than commercial Li-ion batteries. Despite this promise, catalyzing oxidation of discharge products, Li₂O₂ and LiOH, during charging remains an obstacle to improved cycle life and round-trip efficiency. In this work, reactions between LiI, a soluble redox mediator added to catalyze the charging process, and Li₂O₂ and LiOH are systematically investigated. We show that stronger solvation of Li⁺ and I⁻ ions led to an increase in the oxidizing power of I₃⁻, which allowed I₃⁻ to oxidize Li₂O₂ and LiOH in DMA, DMSO, and Me-Im, whereas in weaker solvents (G4, DME), the more oxidizing I₂ was needed before a reaction could occur. We observed that Li₂O₂ was oxidized to O₂, whereas LiOH reacts to form IO⁻, which could either disproportionate to LiIO₃ or attack solvent molecules. This work clarifies significant misconceptions in these reactions and provides a thermodynamic and selectivity framework for understanding the role of LiI in Li-O₂ batteries.
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|a Article
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|t Joule
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