A high energy and power sodium-ion hybrid capacitor based on nitrogen-doped hollow carbon nanowires anode

作者：Li, Dongdong; Ye, Chao; Chen, Xinzhi^*; Wang, Suqing; Wang, Haihui^*

来源：Journal of Power Sources, 2018, 382: 116-121.

DOI：10.1016/j.jpowsour.2018.02.036

• Sodium-ion hybrid capacitor
• Anode
• Capacitive contribution
• Nanowires
• Full carbon energy storage devices

The sodium ion hybrid capacitor (SHC) has been attracting much attention. However, the SHC's power density is significantly confined to a low level due to the sluggish ion diffusion in the anode. Herein, we propose to use an electrode with a high double layer capacitance as the anode in the SHC instead of insertion anodes. To this aim, nitrogen doped hollow carbon nanowires (N-HCNWs) with a high specific surface area are prepared, and the high capacitive contribution during the sodium ion storage process is confirmed by a series of electrochemical measurements. A new SHC consisting of a N-HCNW anode and a commercial active carbon (AC) cathode is fabricated for the first time. Due to the hybrid charge storage mechanism combining ion insertion and capacitive process, the as-fabricated SHC strikes a balance between the energy density and power density, a energy density of 108 Wh kg(-1) and a power density of 9 kW kg(-1) can be achieved, which overwhelms the electrochemical performances of most reported AC-based SHCs.

• 出版日期2018-4-1
• 单位华南理工大学