Silicon-Reduced Graphene Oxide Composite as Negative Electrode of Li-Ion Batteries

Abstract

Two types of treatment of the initial mechanical mixture [silicon nanopowder and graphene oxide (GO)] for obtaining Si/RGO nanocomposites were used: reduction in hydrazine vapor and heat treatment at 550°C in an argon atmosphere. It was shown that the type of reduction has an influence on the morphological and electrochemical characteristics of the composites due to the formation of defects and the presence of nitrogen in the graphene network. Less defective and nitrogen doped Si/RGO composites have a better electrochemical behavior as an active material of negative electrode for lithium-ion batteries. The discharge capacity of electrodes based on Si/RGO nanocomposites amounted to 437 mA h g–1 without polymer binder and 1192 mA h g–1 with CMC as a binder.