Rational design of redox mediators for advanced Li-O2 batteries

Title
Rational design of redox mediators for advanced Li-O2 batteries
Authors
임희대홍지현이민아이병주Yongping Zheng김진수권혁조고영민조경재강기석
Issue Date
2016-05
Publisher
Nature energy
Citation
VOL 1-16066-9
Abstract
The discovery of effective catalysts is an important step towards achieving Li– O2 batteries with long cycle life and high round-trip efficiency. Soluble-type catalysts or redox mediators (RMs) possess great advantages over conventional solid catalysts, generally exhibiting much higher efficiency. Here, we select a series of organic RM candidates as a model system to identify the key descriptor in determining the catalytic activities and stabilities in Li– O2 cells. It is revealed that the level of ionization energies, readily available parameters from a database of the molecules, can serve such a role when comparing with the formation energy of Li2O2 and the highest occupied molecular orbital energy of the electrolyte. It is demonstrated that they are critical in reducing the overpotential and improving the stability of Li– O2 cells, respectively. Accordingly, we propose a general principle for designing feasible catalysts and report a RM, dimethylphenazine, with a remarkably low overpotential and high stability.
URI
http://pubs.kist.re.kr/handle/201004/67587
ISSN
2058-7546
Appears in Collections:
KIST Publication > Article
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