<p>Lithium-ion batteries, widely employed today, utilize lithium-cobalt oxides as cathode materials crucial for their performance. One major issue in these batteries is degradation caused by hydrogen generation through water splitting. In a recent study, researchers from Meijo University have investigated how hydrogen is gained and lost in these materials, shedding light on their preferred locations. Consequently, these findings are expected to aid the development of efficient batteries and environmentally friendly hydrogen production.</p>