Interface and Safety Properties of Phosphorus-Based Negative Electrodes in Li-Ion Batteries
Interface and Safety Properties of Phosphorus-Based Negative Electrodes in Li-Ion Batteries
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DOI：
10.1021/acs.chemmater.7b01128
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发表时间：
2017-08
影响因子：
8.6
通讯作者：
C. Marino;M. Kazzi;Erik J. Berg;Minglong He;C. Villevieille
中科院分区：
文献类型：
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作者：
C. Marino;M. Kazzi;Erik J. Berg;Minglong He;C. Villevieille
由于磷的理论比电荷高6倍，因此被认为是替代石墨作为锂离子电池电极中的活性材料的有希望的候选物。不幸的是，磷基电极在循环时遭受大的体积变化，导致差的电化学性能。此外，已知赤磷（Pred）一旦与水接触（即使在ppm水平）就会释放磷化氢气体（PH 3），因此，需要评估其安全性。在这种情况下，电解质/电极界面的Pred电极在第一锂化过程中，充分研究使用扫描电子显微镜（SEM），X射线光电子能谱（XPS），和在线电化学质谱（OEMS）。XPS分析表明，在高于1 V的电位相对于Li+/Li，Pred开始通过最外层的表面层，这是主要由原生氧化物，P2 O 5，形成H3 PO 4反应。一旦这种表面氧化物被消耗，Pred就会与潮湿的...
Phosphorus is considered as a promising candidate for the replacement of graphite as the active material in Li-ion battery electrodes owing to its 6-fold higher theoretical specific charge. Unfortunately, phosphorus-based electrodes suffer from large volume changes upon cycling, leading to poor electrochemical performance. Furthermore, red phosphorus (Pred) is known to release phosphine gas (PH3) once in contact with water (even at the ppm level), and thus, its safety profile needs to be assessed. In this context, the electrolyte/electrode interface of a Pred electrode during the first lithiation is fully investigated using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and online electrochemical mass spectroscopy (OEMS). The XPS analyses reveal that, at potentials higher than 1 V vs Li+/Li, the Pred starts to react via the outermost surface layer, which is mainly composed of the native oxide, P2O5, to form H3PO4. Once this surface oxide is consumed, the Pred reacts with moist...