Conductive TiN thin layer-coated nitrogen-doped anatase TiO2 as high-performance anode materials for sodium-ion batteries |
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| Authors: | Xiao Ma Jian-Liya Tian Fei Zhao Jie Yang Bao-Feng Wang |
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| Affiliation: | 1.Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, College of Environmental and Chemical Engineering,Shanghai University of Electric Power,Shanghai,China;2.Shanghai Key Laboratory of Chemical Assessment and Sustainability, School of Chemical Science and Engineering,Tongji University,Shanghai,China |
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| Abstract: | Nitrogen-doped anatase titanium oxide (N-TiO2) with enhanced electronic conductivity induced by titanium nitride (TiN) thin layer coating was employed as high-performance anode material for sodium-ion batteries. The TiN thin layer can not only dramatically increase the electronic conductivity among crystal grains but also alleviate the volume expansion to consolidate the structure during long-term sodiation and desodiation process. The composite exhibits an excellent electrochemical performance, delivering a high specific capacity of 226.9 mA h g?1 at 0.1 C and owning excellent rate capability of 158.3 mA h g?1 at 10 C high rate. Moreover, the composite has no obvious capacity decay after 500 cycles at 1 C, showing its superior cycling performance. The enhancement of electrochemical performance may be attributed to the faster kinetics of sodium ion sodiation/desodiation, which could be a result of enhanced electronic conductivity due to the formation of TiN thin layer coating. |
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