The influence of nanostructured carbon additives to the functional electrode characteristics of lithium-ion batteries

Abstract

This research is devoted to the study of the effect of nanostructured carbon additives on the functional characteristics of a positive electrode based on vanadium oxide for lithium-ion batteries. It has been shown that the use of carbon nanotubes and graphene oxide instead of traditional carbon black significantly increases the specific characteristics of the electrode. Also the improvement of the specific characteristics of the positive electrode in lithium-ion batteries when using graphene and carbon nanotubes instead of carbon black was proved. This effect is explained by an increase in the speed of movement of lithium ion inside the material, due to the higher conductivity of nanotubes and graphene, and a more compact contact of crystals. It is due to higher electronic conductivity of carbon nanotubes and graphene compared to conventional carbon black. In addition, the intercalation of quasi-one-dimensional (nanotubes) and quasi-two-dimensional (graphene) structures into the electrode makes possible to ensure a more compact contact of active substance particles with a current collector. This helps to reduce the mass fraction of the conductive additive in the electrode structure and increase its specific parameters. It is shown that the use of graphene and carbon nanotubes as conductive additives instead of conventional carbon black may increase significantly the specific characteristics of positive electrodes in lithium-ion batteries.