报 告 人：张跃钢 研究员
Abstract: Development of advanced electrochemical battery system is required to meet the increasing demands for large-scale electrical energy storage. For the electrode materials of lithium ion batteries, silicon, tin, and some transition metal oxides are well known as high-capacity anode materials. However, these materials suffer from huge volume change during charge and discharge, which leads to poor cycling performance. On the cathode side, sulfur is one of the most promising cathode materials with a high theoretical capacity of about 1675 mAh g-1. However, the current lithium-sulfur cells suffer from the low electronic conductivity of sulfur electrodes and the high solubility of long chain polysulfide ions in organic solvent-based electrolytes. To solve these problems, we designed and fabricated electrochemically active nanocomposite materials by using novel carbon nanostructures, such as graphene, graphene oxides, and porous carbon nanofibers, as matrices. The new nanocomposite anodes (such as graphene-Si, graphene-Sn, graphene-Fe3O4, etc) and cathodes (such as graphene oxide-sulfur, porous carbon nanofiber-sulfur, carbon-Li2S, etc.) enabled us to significantly improve the specific capacities, charge/discharge rates, and cycle lives in rechargeable lithium batteries.