Rational design of redox mediators for advanced Li-O2 batteries
- Rational design of redox mediators for advanced Li-O2 batteries
- 임희대; 홍지현; 이민아; 이병주; Yongping Zheng; 김진수; 권혁조; 고영민; 조경재; 강기석
- Issue Date
- Nature energy
- VOL 1-16066-9
- 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.
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