A facile and cost effective synthesis of nitrogen and fluorine Co-doped porous carbon for high performance Sodium ion battery anode material

• Published in: Journal of power sources 2020-02, Vol.448, p.227568, Article 227568
• Main Authors: He, Qiuchen, Jiang, Jianhong, Zhu, Jinliang, Pan, Zhiyi, Li, Chunliu, Yu, Mengya, Key, Julian, Shen, Pei Kang
• Format: Article
• Language: English
• Subjects: 3D carbon networks; Hierarchical porosity; Nitrogen and fluorine co-doping; Polytetrafluoroethylene; Sodium ion battery anode
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2019.227568

The development of cost effective, high performance, electrode materials for sodium ion batteries is of critical importance for large scale energy storage. Herein, we synthesize a novel nitrogen and fluorine co-doped porous carbon using a facile one-pot pyrolysis of three low cost components: polytetrafluoroethylene, a nitrogen-containing resin, and potassium hydroxide. The co-doped carbon comprises 3D assemblies of highly porous sheets with defects/disorders (and wide interlayer spacing of ~0.42 nm), which have a large surface area of 2040.3 m2 g−1 with hierarchical pore sizes. The advantageous combination of these structural features facilitates high sodium ion storage capacity, fast transfer kinetics and stable cycling. As a result, the co-doped carbon delivers an impressive 312.6 mAh g−1 at 0.1 A g−1 after 300 cycles and 215.3 mAh g−1 at 5 A g−1 after 5000 cycles (or 0.005% loss per cycle). Therefore, the excellent cycling performance of the carbon in combination with its convenient and low cost synthesis offers a promising sodium ion battery anode material for large scale energy storage. [Display omitted] •A unique NF-3DC is achieved by one-pot pyrolysis of PTFE, N-containing resin and KOH.•NF-3DC contains abundant macro, meso and micropores, and enlarged interlayer gaps.•NF-3DC exhibits large reversible capacity and ultra-stable cycle performance in SIB.