Hybrid Electrochemical Behaviour of La <sub>1-x</sub> CaxMnO <sub>3</sub> Nano Perovskites and Recycled Polar Interspersed Graphene for Metal-Air Battery System
R. Brindha, R. Mohanraj, P. Manoj Kumar, M. Selvam, K. Sakthipandi
Abstract
Accumulations of waste dry cell batteries create irreparable damage to the environment. To address this issue, herewith we recycle the graphite electrode from waste dry cells to serve as a precursor for synthesising graphene electrolyte additives in metal-O 2 battery system. Magnesium‐O 2 battery is an interesting option due to its high theoretical energy density (6800 WhKg −1 ) but tuning the electrode-electrolyte interfacial layer plays a major role. Utilizing La 1-x Ca x MnO 3 (x = 0.70, 0.80 and 0.90) manganite perovskite and polar interspersed graphene as protective electrode-electrolyte passivation layers, drastically increases the battery performance. La 1-x Ca x MnO 3 protective layer enhances the charge separation, charge transfer, reaction kinetics and reduces the charge recombination at the electrode surface. The specific discharge capacity of newly prepared La 1-x Ca x MnO 3 /interspersed graphene based Mg-air battery system is 1595.3 mAhg −1 , which makes it more superior to regular Mg-O 2 battery (890 mAhg −1 ). The interspersed graphene -based Mg/La 1-x Ca x MnO 3 air battery shows excellent discharge capacity and notable electrochemical characteristics, which opens whole new spectrum of opportunity in modern electric vehicles.