(696i) Novel Cathode Framework of Nanostructured Titanium Nitride/Graphene for Advanced Lithium Sulfur Batteries

Zeng, W., Wayne State University
Cheng, M., Wayne State University
Ng, S., Wayne State University
Nanostrucutred titanium nitride (TiN) and graphene composite electrodes have been fabricated through a facile ultrasonication method combined with melt-diffusion of elemental sulfur. Nanostructured TiN particles and tube arrays integrated with graphene substrate lead to the formation of a porous structure with enhanced electrical conductivity and stabilized integrated structure. Such a framework may facilitate accessibility of electrolyte and fast transfer of charges. The specific capacities of the Li-S batteries with TiN nanotube/ and nanoparticles/ graphene composites are 1229 and 1085 mAh g-1 after 180 cycles under 0.1 C rate, respectively, which are significant better than pure TiN nanostructures. The specific capacity and capacity retention were investigated as a function of TiN nanotubes to graphene ratio. The optimal ratio was found to be 1:1 TiN/Graphene, with the highest capacity retention of 87.5% after 180 cycles. This optimal 3D hybrid structure may provide a balance of high specific capacity and electrochemical stability, allowing durable and efficient energy storage and conversion over long cycles.