کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5431770 | 1508823 | 2017 | 8 صفحه PDF | دانلود رایگان |
- Solid-state synthesis of N-doped carbon coated Na3V2(PO4)3.
- N-doping affects the disorder and graphitic characters of the carbon layer.
- N-doped carbon coating leads to highly decreased charge transfer resistance.
- N-doped carbon coated Na3V2(PO4)3 composite electrode shows decreased polarization.
- Higher N-doping levels ensure better cycling stability.
Na3V2(PO4)3 (NVP) is a promising cathode material for sodium ion batteries due to the good electrochemical performance in terms of cycling stability and rate capability. However, in order to access this performance a carbon coating is required to enhance the intrinsically poor material's conductivity. Herein, we systematically investigate the role of N-doped carbon (NC) coatings on both the structural and electrochemical properties of NVP materials. NC-coated NVP materials with various nitrogen contents have been rationally synthesized by a novel solid-state method allowing the selective N-doping of the carbon coating. In fact, the N-doping changes the disorder and graphitic character of the carbon layer, strongly impacting the electrochemical performance of the NVP/C composite materials. Results suggest that the appropriate N-doping amount of the carbon leads to highly decreased electrode polarization and excellent cycling stability at high rate, enabling the NVP materials with high energy and power efficiencies.
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Journal: Carbon - Volume 124, November 2017, Pages 334-341