Development of a Hydrophobic Ni₀.₅Mn₀.₅Co₂O₄-Based Gel Matrix for Mitigating Moisture-Induced Degradation in Li-Air Batteries

Abstract

A Ni0.5Mn0.5Co2O4-loaded three-dimensional sodium alginate gel was synthesized as an efficient catalyst for Li-air batteries. The catalyst was further treated with hydrophobic treatment, which greatly extended the lifespan in humid environment. At a current density of 500 mA g-1, the modified batteries demonstrated remarkable cycle stability, achieving 142 cycles in pure oxygen, 91 cycles in ambient air (~40% relative humidity, RH), and 58 cycles in humid oxygen (~55% RH). Additionally, the discharge cut-off capacities were significantly enhanced, reaching 19876.5 mAh g-1 and 16465.6 mAh g-1 at a current density of 200 mA g-1 in ambient air and humid oxygen, respectively.

Keywords: Sodium alginate gel, Li-air battery, Catalyst, Anodic corrosion