Effect of carbon dioxide on lithium anode cycleability with various substrates

The effect on the enhancement of the charge/discharge behavior of electrodeposited lithium metal on various substrates with CO₂ was investigated in LiClO₄/propylene carbonate electrolyte. The lithium cycleability was enhanced with CO₂ addition to the electrolyte solution when using nickel and titanium substrates, whereas no apparent enhancement was observed with copper and silver substrates. The results obtained from voltammetry indicated that the reduction of CO₂ did not occur on nickel and titanium, but on copper and silver. It is suggested that the enhancement with CO₂ addition is effective with the substrates which do not reduce CO₂ in the electrolyte before lithium deposition.