Study on Ability of CuO spherical nanoparticles as an Electrocatalyst and Ionic Liquid of ۲-hydroxyethanoleamine Acetate [۲-HEA][Ac] as a Conductive Electrolyte in Lithium-Air Battery

In the ۲۰۲۲ and past decade about founding energy storage sources, the metal-air batteriesespecially lithium-air batteries are the more promising rechargeable energy storage systemsrather than others such as lithium-ion batteries due to the having much higher energy densities,long-life time and low cost [۱]. The rapid depletion of finite fossil fuels makes the developmentof the clean and low cost energy storages as a worldwide imperative. The lithium-air batterieshave the highest theoretical specific energy about ۱۱۱۴۰ Wh kg-۱ compared to gasoline [۲,۳]. Forthese reasons, a simple and low-cost lithium-air battery was designed. In this battery, an effectivesynthesized electronanocatalyst was used for modification of air cathode, the filter paper wasused as a separator and a conductive ionic liquid namely ۲-hydroxyethanoleamine acetateabbreviated [۲-HEA][Ac] was used as a non-aqueous solvent which containing dissolvedlithium acetate with certain concentration as green electrolyte. The CuO spherical nanoparticles(NP-CuO) was synthesized and used as electrocatalyst. The synthesized electrocatalyst wascharacterized by XRD, FTIR and SEM techniques. The electrocatalyst with size particle averageof ۴۶ nm after mixing with Super-P carbon and PTFE as binder was sprayed on the air electrode(carbon sheet) uniformly. A high discharge capacity, non-flammability of electrolyte, stablereversibility, long life-time and low over potential were observed in electrochemical tests of thebattery. It was found from results that the cycles performance of charging/discharging of batterywas reached about ۵۰۰ cycles without any decreasing in the discharge potential. Theperformance of the battery was compared in two states with and without electrocatalyst. Thedischarge capacity at the current density of ۰.۱ mA cm-۲ in charge potential of ۴.۰ V for batterywith catalyst:green electrolyte was ۳۰۵۴ mAh g-۱ and without electrocatalyst:common electrolytewas ۹۸۶ mAh g-۱, respectively. Furthermore, results showed that the usage of ionic liquid aselectrolyte solvent leads to the increase in the safety and life-time of the battery during batterytesting.

کلیدواژه ها:

Li-air battery ، NP-CuO ، Ionic liquid ، [۲-HEA][Ac] ، Improved performance