Influence of carbon dioxide on the performance of natural graphite electrodes for lithium-ionic power sources

The influence of carbon dioxide on the electrochemical behaviour of negative electrodes made of natural graphite was studied. Argon replacement by СO₂ in the assembly box was found to reduce the irreversible capacity of negative electrodes by 5-12 times and to enhance the reversible one by 20% on the average. The Coulombic cycling efficiency of the first cycle of graphite electrodes in a 1 M LiP₆, solution in a propylene carbonate – diethyl carbonate (1:4) mixture increases by 2-2.5 times, up to 60-75%.