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Salt-assisted in-situ formation of N-doped porous carbons for boosting K+ storage capacity and cycling stability

ZHANG Wen-zhe WANG Huan-lei LIAO Ran-xia WEI Wen-rui LI Xue-chun LIU Shuai HUANG Ming-hua SHI Zhi-cheng SHI Jing

张文哲, 王焕磊, 廖冉霞, 魏文瑞, 李雪纯, 刘帅, 黄明华, 史志成, 时婧. 盐辅助原位制备氮掺杂多孔炭提高储钾容量和循环稳定性[J]. 新型炭材料, 2021, 36(1): 167-178. doi: 10.1016/S1872-5805(21)60011-2
引用本文: 张文哲, 王焕磊, 廖冉霞, 魏文瑞, 李雪纯, 刘帅, 黄明华, 史志成, 时婧. 盐辅助原位制备氮掺杂多孔炭提高储钾容量和循环稳定性[J]. 新型炭材料, 2021, 36(1): 167-178. doi: 10.1016/S1872-5805(21)60011-2
ZHANG Wen-zhe, WANG Huan-lei, LIAO Ran-xia, WEI Wen-rui, LI Xue-chun, LIU Shuai, HUANG Ming-hua, SHI Zhi-cheng, SHI Jing. Salt-assisted in-situ formation of N-doped porous carbons for boosting K+ storage capacity and cycling stability[J]. NEW CARBOM MATERIALS, 2021, 36(1): 167-178. doi: 10.1016/S1872-5805(21)60011-2
Citation: ZHANG Wen-zhe, WANG Huan-lei, LIAO Ran-xia, WEI Wen-rui, LI Xue-chun, LIU Shuai, HUANG Ming-hua, SHI Zhi-cheng, SHI Jing. Salt-assisted in-situ formation of N-doped porous carbons for boosting K+ storage capacity and cycling stability[J]. NEW CARBOM MATERIALS, 2021, 36(1): 167-178. doi: 10.1016/S1872-5805(21)60011-2

盐辅助原位制备氮掺杂多孔炭提高储钾容量和循环稳定性

doi: 10.1016/S1872-5805(21)60011-2
详细信息
  • 中图分类号: TQ127.1+1

Salt-assisted in-situ formation of N-doped porous carbons for boosting K+ storage capacity and cycling stability

Funds: The authors would like to offer special thanks to Qingdao City Programs for Science and Technology Plan Projects (19-6-2-77-cg); Shandong Provincial Key R&D Plan and the Public Welfare Special Program, China (2019GGX102038); Fundamental Research Funds for the Central Universities (No. 201822008 and 201941010); the Shandong Provincial Natural Science Foundation, China (ZR2020ME038); National Natural Science Foundation of China (21471139, 21775142)
More Information
  • 摘要: 钾离子电池因其较高的能量密度和丰富的钾资源,具有成为大规模储能设备的潜力。但钾离子的半径较大引起的可逆容量低和循环稳定性等问题限制了钾离子电池的实际应用。在本项工作中,我们将前驱体细菌纤维素浸泡在作为造孔剂和掺杂剂的Mg(NO3)2溶液中,经炭化和酸洗处理后,制备出氮掺杂细菌纤维素基炭材料(NBCC)。该材料有相互连接的多孔网络结构、均匀的N元素分布(原子占比3.38%)以及高表面积等特点 (1355 m2 g−1)。同时,探究了Mg(NO3)2溶液浓度对材料形貌、孔隙率、N掺杂量和电化学性能的影响。经过性能优化,NBCC作为钾离子电池负极在5 A g−1的大电流密度下,可逆容量可达134 mAh g−1;在2 A g−1的电流密度下,循环2 500圈后,比容量仍保持为307 mAh g−1。以NBCC作为负极组装的钾离子混合电容器,在能量密度为166 Wh kg−1时,具有493 W kg−1的功率密度,循环2 000圈后仍具有95%的容量保持率,证明了该材料具有很强的实际应用潜力。本工作通过简便的合成方法制备的炭负极材料表现出良好的电化学性能,有望促进绿色、大规模储能设备的发展。
  • Figure  1.  (a) Schematic illustration of the synthetic process for NBCC carbon, (b) SEM image of BCC, (c) SEM image of NBCC, (d) TEM image of NBCC, (e) and (f) HRTEM images of NBCC and (g) STEM image and the corresponding EDS mappings.

    Figure  2.  (a) XRD patterns, (b) Raman spectra, (c) Nitrogen adsorption-desorption isotherms curves with the inset of showing mesopore size distributions of BCC and NBCC and (d-f) High-resolution XPS spectra of C 1s, N 1s, O 1s for BCC and NBCC.

    Figure  3.  Electrochemical performance of BCC and NBCC as PIBs anodes in half cells. (a) CV curves at a scan rate of 0.1 mV s−1, (b) Galvanostatic discharge-charge profiles of NBCC at 0.05 A g−1, (c) Rate capability, (d) Comparison of the rate performance between our NBCC electrode and other carbonaceous electrodes, (e) Long cycling performance at 2.0 A g−1, (f) Nyquist plots before and after different cycles, (g) CV curves at different scan rates and fitted lines betweentins log(i) and log(v) of NBCC, (h) Contribution ratio of the capacitive- and diffusion-controlled processes at various scan rates of NBCC and (i) Diffusion coefficients calculated from the GITT profiles during the second potassiation/depotassiation cycle.

    Figure  4.  (a) Schematic diagram of a NBCC//NPC PIHC device, (b) CV curves of the NBCC//NPC PIHC tested from 5 to 100 mV s−1 and (c) Ragone plots of the NBCC//NPC PIHC compared with other reported PIHCs.

    Table  1.   Textural properties and surface chemistry of BCC, NBCC, NBCC-L and NBCC-H.

    SampleTextural PropertiesSurface ChemistryID/IG
    SBETVtotalPore volume (%)CNO
    m2·g−1cm3·g−1V<2 nmV>2 nmat%at%at%
    BCC8900.744.056.096.35-3.651.84
    NBCC-L10251.143.956.194.212.053.741.90
    NBCC13552.123.876.291.453.884.672.24
    NBCC-H9901.516.283.890.153.016.842.73
    下载: 导出CSV
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  • 收稿日期:  2020-12-23
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  • 网络出版日期:  2021-02-03
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