Intensive investigation on all-solid-state Li-air batteries with cathode catalysts of single-walled carbon nanotube/RuO2

The all-solid-state Li-air battery is a promising next-generation energy storage technique because of its high safety and high theoretical specific energy density . The all-solid-state Li-air batteries with LAGP as electrolyte layer , Li foil as anode and a mixture composed of single-walled carbon nanotubes (SWCNTs), RuO 2 nanoparticles and Li 1.5 Al 0.5 Ge 1.5 P 3 O 12 (LAGP) as composite cathode were investigated in ambient air at room temperature . Charge overpotential was reduced because of the superior catalytic activities of RuO 2 nanoparticles . Besides, SEM images showed the formation of chip-like products after discharge to 1000 mA h g -1 and wrinkles-like products after fully discharged to 2 V, respectively. Galvanostatic intermittent titration technique (GITT) demonstrated that the equilibrium voltage of all-solid-state Li-air batteries cycling in oxygen kept stable at 2.96 V while that cycling in ambient air maintained at 3.15 V. These results indicated that the electrochemical reactions of all-solid-state Li-air batteries can be ascribed to the formation and decomposition of lithium peroxide in oxygen and electrochemical reaction with moisture in air.