Enhancing Silicon Performance via LiPON Coating: A Prospective Anode for Lithium Ion Batteries
Enhancing Silicon Performance via LiPON Coating: A Prospective Anode for Lithium Ion Batteries
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DOI：
10.1016/j.electacta.2016.09.040
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发表时间：
2016-11
影响因子：
6.6
通讯作者：
Yaser Hamedi Jouybari;F. Berkemeier
中科院分区：
文献类型：
--
作者：
Yaser Hamedi Jouybari;F. Berkemeier
通过射频磁控溅射合成硅和LiPON的薄膜双层，而两层的厚度都在纳米范围内，即在50和400 nm之间。样品上的电子显微镜证实了层堆叠的良好定义的层结构和高界面质量。此外，与纯硅膜相比，通过计时电位法对双层进行循环锂化/脱锂，揭示了惊人的容量保持率和高库仑效率。电化学性能的这种强烈改善归因于纳米尺寸的LiPON涂层对硅电极的稳定。此外，发现改善的速率取决于LiPON和硅之间的厚度比。因此，分别研究了具有不同厚度的LiPON和硅的样品，以详细了解双层样品的电化学长期稳定性。基于这些调查，建议的机电模型，详细描述了微观降解机制的LiPON涂层硅电极。
Thin film bilayers of silicon and LiPON are synthesized via rf magnetron sputtering, whereas the thickness of both layers is in the nanometer range, i.e. between 50 and 400 nm. Electron microscopy on the samples confirms a well-defined layer structure and a high interface quality of the layer stacks. Cyclic lithiation/delithiation of the bilayers via chronopotentiometry, moreover, reveals an astonishing capacity retention and high coulombic efficiency when compared to pure silicon films. This strong improvement in electrochemical performance is attributed to a stabilization of the silicon electrode by the nano-sized LiPON coating. Moreover, it is found that the rate of improvement depends on the thickness ratio between LiPON and silicon. Hence, samples with different thickness of LiPON and silicon, respectively, are investigated to get detailed insight into the electrochemical long term stability of the bilayer samples. Based on these investigations, an electro-mechanical model is suggested that describes in detail the microscopic degradation mechanism of LiPON coated silicon electrodes.