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N, S co-doped coal-based hard carbon prepared by two-step carbonization and melting salt template method for sodium storage

NIU Hui-zhu WANG Hai-hua SUN Li-yu YANG Chen-rong WANG Yu CAO Rui YANG Cun-guo WANG Jie SHU Ke-wei

牛慧祝, 王海花, 孙立宇, 杨晨榕, 王雨, 曹瑞, 杨存国, 王洁, 舒珂维. 采用两步炭化法和熔盐模板法制备的用于储钠的 N、S 共掺煤基硬碳. 新型炭材料(中英文). doi: 10.1016/S1872-5805(24)60842-5
引用本文: 牛慧祝, 王海花, 孙立宇, 杨晨榕, 王雨, 曹瑞, 杨存国, 王洁, 舒珂维. 采用两步炭化法和熔盐模板法制备的用于储钠的 N、S 共掺煤基硬碳. 新型炭材料(中英文). doi: 10.1016/S1872-5805(24)60842-5
NIU Hui-zhu, WANG Hai-hua, SUN Li-yu, YANG Chen-rong, WANG Yu, CAO Rui, YANG Cun-guo, WANG Jie, SHU Ke-wei. N, S co-doped coal-based hard carbon prepared by two-step carbonization and melting salt template method for sodium storage. New Carbon Mater.. doi: 10.1016/S1872-5805(24)60842-5
Citation: NIU Hui-zhu, WANG Hai-hua, SUN Li-yu, YANG Chen-rong, WANG Yu, CAO Rui, YANG Cun-guo, WANG Jie, SHU Ke-wei. N, S co-doped coal-based hard carbon prepared by two-step carbonization and melting salt template method for sodium storage. New Carbon Mater.. doi: 10.1016/S1872-5805(24)60842-5

采用两步炭化法和熔盐模板法制备的用于储钠的 N、S 共掺煤基硬碳

doi: 10.1016/S1872-5805(24)60842-5
基金项目: 国家自然科学基金(21978164、22078189、22105120号);陕西省杰出青年科学基金(2021JC-046);陕西省高层次人才专项支持计划;陕西省创新支持计划(2021JZY-001);陕西省重点研发计划项目(20120GY-243);陕西省教育厅专项科研基金(20JK0535)
详细信息
    通讯作者:

    王海花,教授. E-mail:whh@sust.edu.cn

    舒珂维,副教授. E-mail:shukw@sust.edu.cn

N, S co-doped coal-based hard carbon prepared by two-step carbonization and melting salt template method for sodium storage

Funds: The authors express sincere thanks to the National Natural Science Foundation of China (21978164, 22078189 and 22105120); Outstanding Youth Science Fund of Shaanxi Province (2021JC-046) and Special Support Program for high level talents of Shaanxi Province; Innovation Support Program of Shaanxi Province (2021JZY-001); Key Research and Development Program of Shaanxi Province (2020GY-243); Special Research Fund of Education Department of Shaanxi (20JK0535)
More Information
  • 摘要: 硬碳因其资源丰富、结构稳定以及安全性高的优势,已成为钠离子电池最受欢迎的阳极材料。其中,煤基衍生硬碳引起了广泛的关注。本工作以长焰煤为碳源,硫脲为氮硫源,NaCl为模板,通过两步炭化工艺和杂原子掺杂相结合的方法合成了N和S共掺杂的煤基炭材料(NSPC1200)。其中两步炭化过程在调节碳微晶结构和扩大层间距方面发挥了至关重要的作用。N和S的共掺杂调节了炭材料的电子结构,赋予了更多的活性位点;此外,引入NaCl作为模板有助于孔结构的构建,有利于电极和电解质之间的接触,实现Na+和电子的有效传输。在协同作用下,NSPC1200表现出优异的储钠能力。在20 mA g−1电流密度下NSPC1200具有314.2 mAh g−1的可逆容量。即使在100 mA g−1下循环200次,仍保持224.4 mAh g−1的比容量。这项工作成功实现了策略性调整煤基炭材料微观结构的目标,最终获得了具有优异的电化学性能的硬碳阳极。
  • Figure  1.  (a) The synthetic schematic diagram of PC1200 and NSPC1200; (b,c) The SEM images of PC1200; (e,f) SEM images of NSPC1200; (d,g) The HRTEM and SAED images of PC1200 and NSPC1200

    Figure  2.  (a) The XRD patterns; (b) Raman spectra; (c) N2 adsorption/desorption isotherm curves and (d) the corresponding pore-size distributions of PC1200 and NSPC1200

    Figure  3.  (a) The XPS survey spectra of NSPC1200; (b,c,d) The high-resolution C 1s, N 1s and S 2p spectra of NSPC1200

    Figure  4.  (a,b) The charge/discharge curves of PC1200 and NSPC1200; (c) The rate performances of PC1200 and NSPC1200; (d) The cycling performances of PC1200 and NSPC1200 at a current density of 100 mA g−1

    Figure  5.  (a) The specific capacity of PC1200 and NSPC1200 from the different plateau (< 0.1 V) and slope (> 0.1V) contributions (discharge capacity at the second cycle); (b) The Nyquist plots of PC1200 and NSPC1200; (c,d) The CV curves of PC1200 and NSPC1200

    Figure  6.  (a) The CV curves at various scan rates (from 0.1 to 1.0 mV s−1); (b) The relationship between the peak current and scan rate in logarithmic format; (c) The capacitive contribution to charge storage at a scan rate of 0.2 mV s−1; (d) The contribution ratio of the capacitive and intercalated charge to capacity at different scan rates

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出版历程
  • 收稿日期:  2023-12-04
  • 录用日期:  2024-01-29
  • 修回日期:  2024-01-27
  • 网络出版日期:  2024-02-06

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