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    钟家宝, 李 瑀, 王 玲, 封 伟. 梧桐果壳衍生硬碳用作钠离子电池负极材料[J]. 功能高分子学报,2022,35(5):408-416. doi: 10.14133/j.cnki.1008-9357.20220401001
    引用本文: 钟家宝, 李 瑀, 王 玲, 封 伟. 梧桐果壳衍生硬碳用作钠离子电池负极材料[J]. 功能高分子学报,2022,35(5):408-416. doi: 10.14133/j.cnki.1008-9357.20220401001
    ZHONG Jiabao, LI Yu, WANG Ling, FENG Wei. Sycamore Husk-Derived Hard Carbon as Anode Material for Sodium-Ion Batteries[J]. Journal of Functional Polymers, 2022, 35(5): 408-416. doi: 10.14133/j.cnki.1008-9357.20220401001
    Citation: ZHONG Jiabao, LI Yu, WANG Ling, FENG Wei. Sycamore Husk-Derived Hard Carbon as Anode Material for Sodium-Ion Batteries[J]. Journal of Functional Polymers, 2022, 35(5): 408-416. doi: 10.14133/j.cnki.1008-9357.20220401001

    梧桐果壳衍生硬碳用作钠离子电池负极材料

    Sycamore Husk-Derived Hard Carbon as Anode Material for Sodium-Ion Batteries

    • 摘要: 采用天然廉价的梧桐果壳作为硬碳前驱体,经过一系列的洗涤、干燥、研磨和除杂,成功制备了在不同碳化温度下的梧桐果壳衍生硬碳。通过扫描电镜、高分辨率透射电镜、X射线衍射、拉曼光谱、等温氮气吸附探究了温度对材料的表面形貌、物相结构以及孔径分布的影响;通过恒电流充/放电、循环伏安和交流阻抗测试考察了材料的电化学性能。结果表明,随着碳化温度的升高,梧桐果壳衍生硬碳的比表面积下降、孔洞减少,且石墨化作用使其层间距下降。当碳化温度为1000 ℃时,硬碳材料的比表面积为4.44 m2/g,首圈库仑效率高达 73%,而首次充/放电比容量分别为 290 mA·h/g和 400 mA·h/g。在电流密度50 mA/g下充/放电100圈后,放电比容量保持在244 mA·h/g,钠离子扩散系数达到10−8 cm2/s,并且在大倍率充/放电过程中保持优良的稳定性能。

       

      Abstract: In this study, sycamore husk was selected as the precursor of hard carbon, and after a series process of washing,drying, grinding and impurity removal, hard carbon derived from sycamore husk-derived was successfully prepared at different carbonization temperatures. Scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and isothermal nitrogen absorption/desorption were used to study the effects of temperature on the surface morphology, phase structure and pore size distribution of the prepared samples, and their electrochemical performances were tested by galvanostatic charge/discharge, cyclic voltammetry, and electrochemical impedance spectroscopy. Results showed that the increase of carbonization temperature decreased the specific surface area, destroyed the internal pore structure and reduced the interlayer distance of hard carbon due to the graphitization effect. When the carbonization temperature rised to 1 000 ℃, the specific surface area of prepared hard carbon was 4.44 m2/g, which delivered the initial charge and discharge capacities of 290 mA·h/g and 400 mA·h/g, associated with the initial coulombic efficiency of 73%. The specific capacity remained as 244 mA·h/g after 100 cycles at 50 mA/g, and the diffusion coefficient of Na+ reached 10−8 cm2/s, accompanying excellent stability even at high rate charge/discharge process.

       

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