Wang Lili, Hu Lei, Yang Wei, Liang Dewei, Liu Lingli, Liang Sheng, Yang Caoyu, Fang Zezhong, Dong Qiang, Deng Chonghai
Department of Chemical and Materials Engineering, Hefei University, Hefei 230601, China.
Nanomaterials (Basel). 2019 Aug 27;9(9):1203. doi: 10.3390/nano9091203.
Heteroatom doping is considered to be an efficient strategy to improve the electrochemical performance of carbon-based anode materials for Na-ion batteries (SIBs), due to the introduction of an unbalanced electron atmosphere and increased electrochemical reactive sites of carbon. However, developing green and low-cost approaches to synthesize heteroatom dual-doped carbon with an appropriate porous structure, is still challenging. Here, N/S-co-doped porous carbon sheets, with a main pore size, in the range 1.8-10 nm, has been fabricated through a simple thermal treatment method, using KOH-treated waste bagasse, as a carbon source, and thiourea, as the N and S precursor. The N/S-co-doped carbon sheet electrodes possess significant defects, high specific surface area, enhanced electronic conductivity, improved sodium storage capacity, and long-term cyclability, thereby delivering a high capacity of 223 mA h g at 0.2 A g after 500 cycles and retaining 155 mA h g at 1 A g for 2000 cycles. This work provides a low-cost route to fabricate high-performance dual-doped porous carbonaceous anode materials for SIBs.
由于引入了不平衡的电子氛围并增加了碳的电化学反应位点，杂原子掺杂被认为是提高钠离子电池（SIBs）碳基负极材料电化学性能的有效策略。然而，开发绿色且低成本的方法来合成具有合适多孔结构的杂原子双掺杂碳仍然具有挑战性。在此，通过一种简单的热处理方法，以KOH处理过的废弃甘蔗渣为碳源、硫脲为氮和硫前驱体，制备出了主要孔径在1.8至10纳米范围内的氮/硫共掺杂多孔碳片。氮/硫共掺杂碳片电极具有显著缺陷、高比表面积、增强的电子导电性、改善的储钠容量和长期循环稳定性，从而在500次循环后于0.2 A g下提供223 mA h g的高容量，并在1 A g下循环2000次后保持155 mA h g。这项工作为制备用于SIBs的高性能双掺杂多孔碳质负极材料提供了一条低成本途径。
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