球磨时间对天然石墨微观结构和可逆储钠性能的影响

发布时间：2018-06-22 01:44

本文选题：钠离子电池 + 天然石墨　；参考：《硅酸盐通报》2016年04期

【摘要】：本文研究了球磨时间对天然球形石墨储钠性能的影响。结果表明,随球磨时间延长,材料由椭球状变为薄片状;晶化程度降低,无定形程度增强,平均晶面间距增大,晶体尺寸减小。编号为Pt0、Pt10、Pt20和Pt30的样品首次放电容量分别为17.2 mAh/g、62.1 mAh/g、128.4 mAh/g、120.1 mAh/g;20次循环以后可逆容量分别为13.9 mAh/g、64.6 mAh/g、114.3 mAh/g、101.6 mAh/g。当电流密度为80m A/g时,Pt20可逆容量达到96.3mAh/g,材料电化学性能提高的原因主要是:球磨时间延长产生更多的表面和缺陷,为钠离子的嵌入(或吸附)构筑更多的活性点。
[Abstract]:The effect of milling time on the sodium storage properties of natural spherical graphite was studied in this paper. The results show that with the increase of milling time, the material changes from ellipsoid to flake, the crystallization degree decreases, the amorphous degree increases, the average crystal plane spacing increases and the crystal size decreases. The initial discharge capacity of the samples numbered Pt0, Pt10, Pt20 and Pt30 are 17.2 mAh-gn, 62.1 mAh-gn, 128.4 mAh / g, 120.1 mAh-g, 20 cycles, respectively, and the reversible capacity after 20 cycles is 13.9 mAhgt, 64.6 mAh / g114.3 mg / g, 101.6 mg / g, respectively. When the current density is 80 Ma / g, the reversible capacity of Pt20 reaches 96.3mAh / g. The main reasons for the improvement of the electrochemical properties of the materials are that more surfaces and defects are produced when the milling time is prolonged, and more active points are constructed for the insertion (or adsorption) of sodium ions.
【作者单位】：辽宁工程技术大学材料科学与工程学院;辽宁工程技术大学矿业学院;
【基金】：国家自然科学基金项目(51274119)
【分类号】：TQ127.11;TM912

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