阴极
涂层
材料科学
氧化物
X射线光电子能谱
电极
铝酸盐
化学工程
锂(药物)
无机化学
原子层沉积
图层(电子)
电解质
电化学
化学
纳米技术
复合材料
冶金
物理化学
内分泌学
工程类
医学
水泥
作者
Meital Turgeman,Miryam Fayena-Greenstein,Shaul Bublil,Netanel Shpigel,Merav Nadav Tsubery,Munseok S. Chae,Yuval Elias,Doron Aurbach
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-01-01
卷期号:168 (1): 010537-010537
被引量:2
标识
DOI:10.1149/1945-7111/abdc7c
摘要
The application of layered oxide compounds as cathode materials for sodium-ion batteries is considered a promising direction for the development of high-energy Na-ion batteries. However, despite many efforts, practical implementation of such electrodes is still challenging, mainly due to structural and surface instabilities associated with the high operating voltage of these cathodes. One of the most effective ways to mitigate these undesirable phenomena is the use of atomic layer deposition (ALD) to form a Nano-sized protective layer on the electrode surface. Application of ALD treatment results in increased electrode stability by preventing irreversible interactions between the electrolyte and cathode material. In search of optimal coating formulations, the effect of various ALD coatings viz. sodium-aluminate, lithium-aluminate, and alumina on the electrochemical performance of Na-NCM cathode synthesized by ion-exchange method. While the initial capacity loss attributed to oxygen release was significantly suppressed in all coated samples, better stability was observed for Na x Al y O z coating. The stabilization mechanism of the Na x Al y O z coating further investigated by XPS, XRD, and TEM revealed improved surface properties that prevent irreversible oxygen loss and migration of manganese from the electrode bulk toward the surface.
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