S-doped carbon@TiO2 to store Li+/Na+ with high capacity and long life-time

Enhanced capacitance by S-doping and protection of TiO2 dense nanocoatings enables excellent specific capacity and stability of S-carbon@TiO2 for Li+/Na+ storage. The theoretical calculation implies that doped sulfur atoms improved the possibility of forming C4Na on the surface of graphite.255