Wolfgang Brehm , Aggunda L. Santhosha , Zhenggang Zhang , Christof Neumann , Andrey Turchanin , Martin Seyring , Markus Rettenmayr , Johannes R. Buchheim , Philipp Adelhelm
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引用次数: 6
Abstract
Copper phosphide (Cu3P) is a potentially high volumetric capacity conversion electrode for the use in Li-ion as well as in Na-ion batteries. Here, we study the lithium and sodium storage properties of Cu3P/Carbon (Cu3P/C) composites containing 70 wt% Cu3P and 30 wt% carbon black. Cu3P is prepared by reactive ball milling from the elements while in a second step Cu3P is mixed with carbon black by non-reactive ball milling. Structure and morphology are characterized by X-ray diffraction (XRD) as well as scanning and transmission electron microscopy (SEM, TEM). The electrochemical properties are studied in Li and Na half cells with different types of electrolytes based on carbonates (EC:DMC mixture) or diglyme, with the latter clearly leading to better results such as higher capacity, better cycle life and smaller polarization. After 120 cycles, the Li-cell showed a capacity of 210 mAh g−1 while around 120 mAh g−1 were found for the Na cell. The contribution of the carbon black is negligible in case of the Li cell while it becomes an important factor in the Na cell. Electrode expansion/shrinkage of the electrode during cycling (“breathing”) as determined by in situ dilatometry is fairly constant in diglyme electrolytes while rapid fading is observed in carbonate electrolytes.
磷化铜(Cu3P)是一种潜在的高容量转换电极,可用于锂离子电池和钠离子电池。在这里,我们研究了含有70 wt% Cu3P和30 wt%炭黑的Cu3P/碳(Cu3P/C)复合材料的锂和钠存储性能。用反应球磨法制备Cu3P,第二步用非反应球磨将Cu3P与炭黑混合。通过x射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对其结构和形貌进行了表征。研究了不同类型碳酸盐(EC:DMC混合物)或双lyme电解质对Li和Na半电池电化学性能的影响,发现后者具有更高的容量、更长的循环寿命和更小的极化等效果。经过120次循环后,锂电池的容量为210 mAh g−1,而钠电池的容量约为120 mAh g−1。在锂电池中,炭黑的贡献可以忽略不计,而在钠电池中,它成为一个重要的因素。电极在循环(“呼吸”)期间的电极膨胀/收缩(由原位扩张测定法确定)在二溶电解质中相当恒定,而在碳酸盐电解质中观察到快速消退。