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KOH Treated Mesocarbon Microbeads as High Rate Anode for Potassium-Ion Batteries

XIAO Nan GUO Hong-da XIAO Jian WEI Yi-bo MA Xiao-qing ZHANG Xiao-yu QIU Jie-shan

肖南, 郭红达, 肖剑, 魏一波, 马晓晴, 张小宇, 邱介山. 氢氧化钾处理中间相碳微球应用于高倍率钾离子电池负极[J]. 新型炭材料. doi: 10.1016/S1872-5805(21)60059-8
引用本文: 肖南, 郭红达, 肖剑, 魏一波, 马晓晴, 张小宇, 邱介山. 氢氧化钾处理中间相碳微球应用于高倍率钾离子电池负极[J]. 新型炭材料. doi: 10.1016/S1872-5805(21)60059-8
XIAO Nan, GUO Hong-da, XIAO Jian, WEI Yi-bo, MA Xiao-qing, ZHANG Xiao-yu, QIU Jie-shan. KOH Treated Mesocarbon Microbeads as High Rate Anode for Potassium-Ion Batteries[J]. NEW CARBON MATERIALS. doi: 10.1016/S1872-5805(21)60059-8
Citation: XIAO Nan, GUO Hong-da, XIAO Jian, WEI Yi-bo, MA Xiao-qing, ZHANG Xiao-yu, QIU Jie-shan. KOH Treated Mesocarbon Microbeads as High Rate Anode for Potassium-Ion Batteries[J]. NEW CARBON MATERIALS. doi: 10.1016/S1872-5805(21)60059-8

氢氧化钾处理中间相碳微球应用于高倍率钾离子电池负极

doi: 10.1016/S1872-5805(21)60059-8

KOH Treated Mesocarbon Microbeads as High Rate Anode for Potassium-Ion Batteries

Funds: National Natural Science Foundation of China (NSFC, No. U2003216); Fundamental Research Funds for the Central Universities of China (No. DUT20LAB131)
More Information
  • 摘要: 石墨具有成本低、放电稳定等优点,是钾离子电池极具发展前景的负极材料之一。但是,它较差的倍率性能仍需改进。本文以中间相碳微球(MCMB)为原料,经过KOH处理,设计了一种新型的石墨化负极。通过有限的氧化和轻微的嵌入,在MCMB表面形成了层间距增大的膨胀层,K+的扩散系数明显提高。作为负极时,改性MCMB在低于0.25 V下展现出高平台容量 (271 mAh g−1),优越的倍率性能(在1.0 A g−1下,容量可达160 mAh g−1),良好的循环稳定性(在0.1 A g−1下循环100圈后,容量维持在184 mAh g−1), 当羧甲基纤维素作为粘结剂时具有高的首次库仑效率(79.2%)。本工作为设计具有优良储钾性能的石墨化材料提供了一种简便的策略。
  • Figure  1.  SEM images of (a, c) MCMB and (b, d) K3C-900. (e, f) HRTEM images of K3C-900.

    Figure  2.  Structure and chemical composition characterization of MCMB and K3C-900: (a) XRD patterns; (b) Raman spectra and (c) XPS spectra. (d) O1s XPS spectrum of K3C-900.

    Figure  3.  Scheme of potassium-ion diffusion into (a) MCMB and (b) K3C-900.

    Figure  4.  Initial five cycles of discharge-charge curves of (a) MCMB and (b) K3C-900 at 0.05 A g−1; CV profiles of (c) MCMB and (d) K3C-900with a scan rate of 0.1 mV s−1.

    Figure  5.  Electrochemical performance of MCMB and K3C-900: (a) Rate performance at current densities from 0.05 A g−1 to 2.00 A g−1; (b) Cycling performance at a current density of 0.1 A g−1; (c) Nyquist plots of MCMB and K3C-900. (d) The linear fitting between Z' versus ω−1/2 of MCMB and K3C-900 at low-frequency region.

    Figure  6.  Operando XRD contour pattern of K3C-900 and the corresponding galvanostatic curve during the initial discharge.

    Figure  7.  Electrochemical performance of MCMB and K3C-900 with CMC as binder: (a) Charge-discharge profiles of initial five cycles; (b) Cycling performance at 0.1 A g−1.

    Figure  8.  (a) Rate performance comparison of K3C-900 with the reported carbon anodes. (b) Initial coulombic efficiency and discharge capacity (below 0.25 V) comparison of K3C-900 (using CMC as binder) with the reported carbon anodes.

    Table  1.   Ultimate analysis (wt. %) of MCMB and K3C-900.

    CHNOdiff
    MCMB97.310.0402.65
    K3C-90096.070.1403.79
    diff: by difference
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-01-01
  • 修回日期:  2020-01-01
  • 网络出版日期:  2021-04-28

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