Development of chemical and biologically synthetic metal oxide based cathode electrodes for lithium air battery applications

Keywords: MnO2, Catalyst, Lithium-oxygen battery, Hollow structure, Nanowire There is a considerable demand for the high capacity rechargeable storage systems throughout the world. Lithium-oxygen (Li-O2) batteries are considered the next-generation energy storage systems due to their high energy storage capacity close to fossil fuels. MnxOy polymorphs are frequently utilized in Li-O2 battery systems as catalysis. Among MnxOy polymorphs, MnO2 and Mn2O3 are highly promising systems to be utilized in Li-O2 battery systems. Although, individual studies were carried out for the electrochemical performance of these polymorphs in Li-O2 battery systems. In the current study, we investigated the effect of morphology and crystal phase by analyzing the performance of the different structure of hollow structured α-MnO2 nanoparticles and hollow Mn2O3 polymorphs and nanowire Biyo-α-MnO2 in Li-O2 battery systems. battery performance. Moreover, different parameters (eg reaction time, acidity, calcination temperature) were investigated to observe the morphological evolution of hollow structure MnO2. Our results indicate the superior performance that biyo nanowire MnO2 compared to hollow α-MnO2 and Mn2O3, which is attributed to the crystalline structure and size of biyo-α-MnO2, and enhances the surface area of the catalysis. Capacity-limited electrochemical tests reveal that nanowire biyo- MnO2 provides 800 mAh g-1 capacity for 60 cycles without loss of capacity and 10.2%capacity loss after 60 cycles. However, the hollow Mn2O3 and α-MnO2 nanospheres can provide the same capacity for 50 and 40 cycles.