Na2Ti3O7@N‐Doped Carbon Hollow Spheres for Sodium‐Ion Batteries with Excellent Rate Performance

Uniform Na 2 Ti 3 O 7 hollow spheres assembled from N‐doped carbon‐coated ultrathin nanosheets are synthesized. A unique multilayer structure of nanosheets is presumed to significantly reduce energy consumption during the diffusion process of sodium ions, while the carbon‐coated structure can increase the overall conductivity. The as‐prepared sample used as an anode in sodium‐ion batteries exhibits the best rate performance ever reported for Na 2 Ti 3 O 7 , delivering more than 60 mAh g −1 after 1000 continuous cycles at the high rate of 50 C, which was achieved due to its unique structure.