AUTHOR=Hsu Bing-Ze , Lai Jun-Kai , Lee Yi-Hsuan 

TITLE=La-based perovskites for capacity enhancement of Li–O2 batteries

JOURNAL=Frontiers in Chemistry

VOLUME=11

YEAR=2023

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1264593

DOI=10.3389/fchem.2023.1264593

ISSN=2296-2646

ABSTRACT=<p>Li–O<sub>2</sub> batteries are a promising technology for the upcoming energy storage requirements because of their high theoretical specific energy density of 11,680 Wh kg<sup>−1</sup>. Currently, the actual capacity of Li–O<sub>2</sub> batteries is much lower than this theoretical value. In many studies, perovskites have been applied as catalysts to improve the air electrode reactions in Li–O<sub>2</sub> batteries. The effects of structure and doping on the catalytic activity of perovskites are still unclear. La<sub>1-x</sub>Sr<sub>x</sub>CoO<sub>3-δ</sub> (<italic>x</italic> = 0.1, 0.3, and 0.5) and La<sub>0.9</sub>Sr<sub>0.1</sub>YbO<sub>3-δ</sub> mixed with carbon black (Vulcan XC500 or Super P) were used as air electrode catalysts. Electrochemical characterizations were conducted using a Swagelok-type cell. The charge–discharge capacity and cyclic voltammetry (CV) performance were investigated in this study. The La<sub>1-x</sub>Sr<sub>x</sub>CoO<sub>3-δ</sub> (<italic>x</italic> = 0.1, 0.3, and 0.5) is a suitable cathode catalyst for Li–O<sub>2</sub> batteries. In this study, the La<sub>0.5</sub>Sr<sub>0.5</sub>CoO<sub>3-δ</sub>/Super P cathode demonstrated the highest discharge capacity (6,032 mAh g<sup>−1</sup>). This excellent performance was attributed to the large reaction area and enhanced Li<sub>2</sub>CO<sub>3</sub> generation.</p>