Vacancy‐induced LaMnO <sub>3</sub> Perovskite as Bifunctional Air‐breathing Electrode for Rechargeable Lithium‐Air Battery
Vaithiyanathan Sankar Devi, Mattath Athika, Perumal Elumalai
Abstract
Abstract Development of cost‐effective efficient bifunctional electrocatalysts is indispensable for commercialization of metal‐air batteries. Here, vacancy‐induced nanostructured LaMnO 3 perovskite was generated by a facile hydrothermal method and explored as a bifunctional air‐breathing electrode for rechargeable Lithium‐Air battery. Materials characterizations confirmed the formation of the nanostructured LaMnO 3 with anion and cation vacancies. The LaMnO 3 electrocatalyst on rotating ring disc electrode study showed excellent oxygen reduction reaction and oxygen evolution reaction activities in 0.1 M KOH electrolyte. The oxygen vacancies associated with the LaMnO 3 acted as catalyst centre and promoted reaction rate for the ORR and OER. Laboratory prototype CR‐2032 air‐coin cell was fabricated using the LaMnO 3 as air‐breathing electrode, resulted open circuit voltage 3.3 V for more than 5 days and high discharge capacity of 3100 mA h g −1 at current density of 50 mA g −1 . Further, once charged air‐coin cell could power an LED for more than 24 h continuously.