The effect of diamond-like carbon coating on LiNi0.8Co0.15Al0.05O2 particles for all solid-state lithium-ion batteries based on Li2S–P2S5 glass-ceramics
The effect of diamond-like carbon coating on LiNi0.8Co0.15Al0.05O2 particles for all solid-state lithium-ion batteries based on Li2S–P2S5 glass-ceramics
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DOI：
10.1016/j.jpowsour.2016.02.088
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发表时间：
2016-05
影响因子：
9.2
通讯作者：
Heidy Visbal;Y. Aihara;S. Ito;Taku Watanabe;Youngsin Park;S. Doo
中科院分区：
文献类型：
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作者：
Heidy Visbal;Y. Aihara;S. Ito;Taku Watanabe;Youngsin Park;S. Doo
关于在正极活性材料上涂覆金属氧化物锂来改善全固态电池性能的报道已有几篇。然而，绩效改善的机制尚不清楚。为了更好地了解表面涂层的影响，我们用化学气相沉积(CVD)的方法研究了类金刚石(DLC)涂层对LiNi0.8Co0.15Al0.05O2(NCA)的影响。DLC包覆的NCA具有良好的循环性能和倍率性能。在阻抗谱中观察到的阴极和电解液的界面电阻的降低进一步支持了这一结果。用透射电子显微镜电子能量损失谱(TEMEELS)对DLC层进行了分析。100次循环后，用X射线光谱仪(XPS)和飞行时间二次离子质谱仪(TOF-SIMS)对样品进行分析。这些分析表明，涂层的厚度平均约为4 nm，阻碍了阴极粒子与固体电解质之间的副反应。这一研究结果将为理解阴极材料缓冲层的性质提供有用的见解。
There have been several reports on improvements of the performance of all solid-state battery using lithium metal oxide coatings on the cathode active material. However, the mechanism of the performance improvement remains unclear. To better understand the effect of the surface coating, we studied the impact of diamond-like carbon (DLC) coating on LiNi0.8Co0.15Al0.05O2(NCA) by chemical vapor deposition (CVD). The DLC coated NCA showed good cycle ability and rate performance. This result is further supported by reduction of the interfacial resistance of the cathode and electrolyte observed in impedance spectroscopy. The DLC layer was analyzed by transmission electron microscopy electron energy loss spectroscopy (TEM-EELS). After 100 cycles the sample was analyzed by X-ray photo spectroscopy (XPS), and Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS). These analyses showed that the thickness of the coating layer was around 4 nm on average, acting to hinder the side reactions between the cathode particle and the solid electrolyte. The results of this study will provide useful insights for understanding the nature of the buffer layer for the cathode materials.