Vacancy‐induced LaMnO₃ Perovskite as Bifunctional Air‐breathing Electrode for Rechargeable Lithium‐Air Battery

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 À 1 at current density of 50 mA g À 1 . Further, once charged air-coin cell could power an LED for more than 24 h continuously.

Boosting the Bifunctional Oxygen Electrode Activity of Nitrogen-decorated Carbon Networks via Ni/NiO Addition for Li-Air and Zn-Air Batteries

“…This feature confirms that the kinetics of the ORR follows first-order kinetics. 37,39 Further, the number of electrons (n) and the percentage of H 2 O 2 formation can be calculated using the ring current and the disc current shown in Fig. 6b…”

Research Progress of Perovskite-Based Bifunctional Oxygen Electrocatalyst in Alkaline Conditions

“…The incorporation of anionic defect engineering, such as oxygen vacancies or anion doping, has been previously demonstrated to positively influence the bifunctional electrocatalytic activity and stability towards ORR/OER in in perovskite oxides [92][93][94][95][96]. The presence of anionic defects can enhance the capability of electron trapping, fine-tune energy band structures, and optimize catalytic reaction pathways in perovskite oxides.…”

Selenium heteroatom-doped mesoporous carbon as an efficient air-breathing electrode for rechargeable lithium–oxygen batteries

“…Among the various post-LIB technologies under consideration, the Li-O 2 battery has an impressive theoretical specific energy of 3500 W h kg À1 (including air mass), which has at least ten times higher specific energy than that of the conventional LIB. [4][5][6][7][8] Also, it is cost-effective and lightweight since it uses the O 2 cathode from atmospheric air during discharge, which replaces the expensive high-massbearing aforementioned metal oxide-based cathodes. 9 A typical Li-O 2 battery contains lithium metal as the anode, O 2 from the atmospheric air as the cathode and an organic solvent containing Li salt as the electrolyte.…”