A 98.2% energy efficiency Li-O2 battery using a LaNi-0.5Co0.5O3 perovskite cathode with extremely fast oxygen reduction and evolution kinetics

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Chemical Engineering Journal, Volume 452
Rechargeable lithium-oxygen (Li-O2) batteries have been regarded as a promising energy storage device, but its practical use is impeded by its low energy efficiency. Herein, a bi-functional catalytic perovskite LaNi0.5Co0.5O3 (LNCO) is employed as the cathode of an efficient Li-O2 battery with a molten nitrate salt electrolyte at 160 °C. It displays a stable low charge–discharge overpotential 50 mV with a high energy efficiency (EE) 98.2 % at 0.1 mA cm−2 for over 100 cycles. The excellent performance is attributed to the extremely fast oxygen reduction and evolution kinetics on the surface of LNCO. The discharge product is Li2O with a porous and fluffy morphology which facilitates the transfer of oxygen and other intermediate species. It is noted that Li2O as a discharge product enables a theoretical specific energy density of 5200 Wh kg−1, which is superior to the Li2O2 as product giving 3500 Wh kg−1 for those ambient temperature Li-O2 batteries.
Funding Information: This work was supported with the start-up package of T10108 professorship offered by Aalto University. Q. Qiu, P. Yao and J. Yuan acknowledge the financial support from the China Scholarship Council (Grant No. 201906150134, 202006120046 and 201906250030). Z.-Z. Pan acknowledges the financial support of the Academy of Finland (Grant No. 324414). The authors acknowledge the technical support of SEM from OtaNano Nanomicroscopy Center and computational resources from CSC-IT center for science, Finland. Publisher Copyright: © 2022 The Author(s)
Li-O battery, LiO pathway, Molten salt, Oxygen reduction mechanism, Perovskite catalyst
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Qiu, Q, Pan, Z-Z, Yao, P, Yuan, J, Xia, C, Zhao, Y & Li, Y 2023, ' A 98.2% energy efficiency Li-O 2 battery using a LaNi- 0.5 Co 0.5 O 3 perovskite cathode with extremely fast oxygen reduction and evolution kinetics ', Chemical Engineering Journal, vol. 452, 139608 . https://doi.org/10.1016/j.cej.2022.139608