Na2 Ti3 O7 @N-Doped Carbon Hollow Spheres for Sodium-Ion Batteries with Excellent Rate Performance

Fangxi Xie; Lei Zhang; Dawei Su; Mietek Jaroniec; Shi-Zhang Qiao

doi:10.1002/adma.201700989

Na₂ Ti₃ O₇ @N-Doped Carbon Hollow Spheres for Sodium-Ion Batteries with Excellent Rate Performance

Adv Mater. 2017 Jun;29(24). doi: 10.1002/adma.201700989. Epub 2017 Apr 18.

Authors

Fangxi Xie¹, Lei Zhang¹, Dawei Su², Mietek Jaroniec³, Shi-Zhang Qiao¹

Affiliations

¹ School of Chemical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia.
² Centre for Clean Energy Technology, Faculty of Science, University of Technology Sydney, Broadway, NSW, 2007, Australia.
³ Department of Chemistry and Biochemistry, Kent State University, Kent, OH, 44242, USA.

PMID: 28417512
DOI: 10.1002/adma.201700989

Abstract

Uniform Na₂ Ti₃ O₇ 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 Na₂ Ti₃ O₇ , 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.

Keywords: anode materials; hollow spheres; rate performance; sodium-ion batteries; ultrathin nanosheets.