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

Qianyuan Qiu, Zheng-Ze Pan*, Penghui Yao, Jiashu Yuan, Chun Xia, Yicheng Zhao, Yongdan Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

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.

Original languageEnglish
Article number139608
Number of pages9
JournalChemical Engineering Journal
Volume452
Early online date12 Oct 2022
DOIs
Publication statusPublished - 15 Jan 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Li-O battery
  • LiO pathway
  • Molten salt
  • Oxygen reduction mechanism
  • Perovskite catalyst

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