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Preparation and characterization of binary and ternary tin-based alloy powders for lithium ion battery

机译:锂离子电池二元和三元锡基合金粉末的制备与表征

摘要

Binary and ternary Sn-based alloy powders were successfully prepared by chemical reduction method. The physical properties of the alloy powders were determined by X-ray diffraction, field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), and nitrogen adsorption method. From the X-ray diffractogram showed that introduction of high concentration of third elements (Mn and Fe) caused the peaks to become more distinct as compared to the binary alloys. Increasing stirring time decreased the crystallite size as calculated using Scherrer's equation. Analysis by using FESEM showed that high composition of third element in Sn-Co system gave spheroid particles in the range of 36.4 to 73.5 nm. Elemental analysis of ternary Sn-based alloy powders synthesized by chemical reduction method was studied using EDX showed the existence of each elements used in the binary and ternary alloy powders. Binary and ternary Sn-based alloy powders showed similar trends for all cycles in charge/discharge test. The first cycle exhibits higher discharge capacity compared to the second and third cycles. Large difference between the experimental and the theoretical values in alloy powders may be due to the formation of solid electrolyte interphase, irreversible Li trapping during charging process and disintegration of the electrode.
机译:通过化学还原法成功制备了二元和三元锡基合金粉末。合金粉末的物理性能通过X射线衍射,场发射扫描电子显微镜(FESEM),能量色散X射线光谱(EDX)和氮吸附法确定。从X射线衍射图可以看出,与二元合金相比,高浓度的第三种元素(锰和铁)的引入使峰变得更加清晰。如使用Scherrer方程式所计算的,增加搅拌时间减小了微晶尺寸。通过FESEM进行的分析表明,在Sn-Co体系中第三元素的高组成使得球状颗粒的范围为36.4至73.5 nm。利用EDX对化学还原法合成的三元锡基合金粉末进行了元素分析,结果表明二元和三元合金粉末中均含有各种元素。二元和三元锡基合金粉末在充电/放电测试的所有循环中都显示出相似的趋势。与第二和第三循环相比,第一循环表现出更高的放电容量。合金粉末中的实验值与理论值之间的较大差异可能是由于形成了固态电解质相间相,在充电过程中不可逆的锂捕获以及电极的分解。

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  • 作者

    Wan Mahmud Wan Zuraidah;

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  • 年度 2014
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  • 原文格式 PDF
  • 正文语种 en
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