Sustainable nitrogen-doped carbon electrodes for use in high-performance supercapacitors and Li-ion capacitors,Sustainable Energy & Fuels

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Sustainable nitrogen-doped carbon electrodes for use in high-performance supercapacitors and Li-ion capacitors
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2019/12/27 , DOI: 10.1039/c9se01064e
Yulong Zheng _{1,

2,

3,

4} , Huanlei Wang _{1,

2,

3,

4} , Shijiao Sun _{4,

5,

6,

7} , Gaofei Lu _{1,

2,

3,

4} , Haolin Liu _{1,

2,

3,

4} , Minghua Huang _{1,

2,

3,

4} , Jing Shi _{1,

2,

3,

4} , Wei Liu _{1,

2,

3,

4} , Haiyan Li _{1,

2,

3,

4}

Affiliation

Designing energy storage systems with both high energy density and power density by using low-cost electrodes is still a formidable challenge. Therefore, we propose a successful doped porous carbon synthesis process using agricultural waste in the form of ginger straw, which can be used for fabricating high-performance supercapacitors and Li-ion capacitors. Nitrogen doping in the carbon structure improves the wettability and alters the electronic structure, playing a pivotal role in providing extra charge storage capacity. The fabricated ionic-liquid-based supercapacitors exhibit an outstanding capacitance of 122 F g⁻¹ at 0.5 A g⁻¹ with a superb capacitance retention ratio of 73% at 100 A g⁻¹, excellent specific energy of 37.8 W h kg⁻¹ at 374 W kg⁻¹, and low capacitance loss of 13.5% after 10 000 cycles. Based on the LiPF₆ electrolyte, doped carbon used as the anode shows a high capacity of 1531 mA h g⁻¹ at 0.1 A g⁻¹, and the fabricated Li-ion capacitor exhibits high specific energy of 214.6 W h kg⁻¹ at 373.5 W kg⁻¹, maintains 63.6 W h kg⁻¹ at the high specific power of 65.4 kW kg⁻¹, and shows promising cycling performance with 82.7% capacity retention after 10 000 cycles. This work highlights the fact that sustainably doped carbon has the potential for large-scale commercial production, and it can be promising for use as an electrode in advanced energy storage systems.

中文翻译：

用于高性能超级电容器和锂离子电容器的可持续氮掺杂碳电极

通过使用低成本电极来设计具有高能量密度和功率密度的能量存储系统仍然是一个巨大的挑战。因此，我们提出了一种利用姜秸秆形式的农业废料成功地掺杂多孔碳的合成方法，该方法可用于制造高性能超级电容器和锂离子电容器。碳结构中的氮掺杂改善了润湿性并改变了电子结构，在提供额外的电荷存储容量方面起着举足轻重的作用。所制造的基于离子液体的超级电容器在0.5 A g ^-1时表现出122 F g ^-1的出色电容，在100 A g ^-1时具有73％的出色电容保持率，比能量为37.8 W h kg ^-1在374 W kg ^-1时，在1万次循环后的低电容损耗为13.5％。基于LiPF ₆电解质，用作阳极的掺杂碳在0.1 A g ^-1下显示出1531 mA hg ^-1的高容量，而制成的锂离子电容器在373.5下显示出214.6 W h kg ^-1的高比能。W¯¯千克^-1，保持63.6 W时千克^-1在65.4千瓦公斤的高比功率^-1，并显示出令人满意的循环性能，在1万次循环后，其容量保持率为82.7％。这项工作强调了一个事实，即可持续掺杂的碳具有大规模商业生产的潜力，并且有望在先进的储能系统中用作电极。

更新日期：2020-03-31

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