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Anchored Mediator Enabling Shuttle-Free Redox Mediation in Lithium-Oxygen Batteries

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Title
Anchored Mediator Enabling Shuttle-Free Redox Mediation in Lithium-Oxygen Batteries
Author(s)
Ko Y.; Park H.; Lee K.; Kim S.J.; Park H.; Bae Y.; Kim J.; Park S.Y.; Kwon J.E.; Kisuk Kang
Subject
energy conversion, ; lithium-oxygen batteries, ; redox chemistry, ; redox mediator, ; shuttle phenomena
Publication Date
2020-03
Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.59, no.13, pp.5376 - 5380
Publisher
WILEY-V C H VERLAG GMBH
Abstract
© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, WeinheimRedox mediators (RMs) are considered an effective countermeasure to reduce the large polarization in lithium-oxygen batteries. Nevertheless, achieving sufficient enhancement of the cyclability is limited by the trade-offs of freely mobile RMs, which are beneficial for charge transport but also trigger the shuttling phenomenon. Here, we successfully decoupled the charge-carrying redox property of RMs and shuttling phenomenon by anchoring the RMs in polymer form, where physical RM migration was replaced by charge transfer along polymer chains. Using PTMA (poly(2,2,6,6-tetramethyl-1-piperidinyloxy-4-yl methacrylate)) as a polymer model system based on the well-known RM tetramethylpiperidinyloxyl (TEMPO), it is demonstrated that PTMA can function as stationary RM, preserving the redox activity of TEMPO. The efficiency of RM-mediated Li2O2 decomposition remains remarkably stable without the consumption of oxidized RMs or degradation of the lithium anode, resulting in an improved performance of the lithium-oxygen cell
URI
https://pr.ibs.re.kr/handle/8788114/7218
DOI
10.1002/anie.201916682
ISSN
1433-7851
Appears in Collections:
HiddenCommunity > 1. Journal Papers (저널논문)
Files in This Item:
[SCI논문]Anchored Mediator Enabling Shuttle‐Free Redox Mediation in Lithium‐Oxygen Batteries.pdfDownload

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