固态电池TiO2/LiPON和LNMC/LiPON固体电极/电解质界面的椭圆偏振光谱研究

IF 5.5 3区 材料科学 Q2 CHEMISTRY, PHYSICAL
Simran Atwal, Vidha Bhasin, Chandrani Nayak, Abharana Nagendra, Vijay Karki, Pratap Kumar Sahoo, Kaustava Bhattacharyya, Dibyendu Bhattacharyya and Arup Biswas*, 
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引用次数: 0

摘要

在全固态薄膜电池中,固体电解质与固体电极之间的界面特性是限制其性能的主要因素;然而,在大多数情况下,对界面属性的了解是有限的。采用磁控溅射技术,在不同溅射条件下制备了Li3+ xPO4-xNx (LiPON)固态电解质薄膜,外加LiPON/TiO2(阳极)和LiPON/LiNi0.33Mn0.33Co0.33O2(阴极)薄膜双层,并用椭圆偏振光谱对其进行了表征,研究了锂离子固态电池电解质/阳极和电解质/阴极界面的性能。对单层LiPON的椭偏光谱、x射线光电子能谱和二次离子质谱研究表明,射频(RF)功率和沉积过程中使用的氮压力控制了薄膜的氮和锂含量。在较高的射频功率下沉积的薄膜折射率较低,表明氮含量较低,薄膜更像li3po4;阻抗测量也证实了这一结果。对LiPON/TiO2和LiPON/LNMC双层膜的界面宽度进行椭偏研究表明,在LiPON溅射过程中,LiPON层的氮含量对界面和TiO2层的锂化有很强的影响;LiPON层中较高的氮含量使两者都增加。这一发现也得到了横断面FESEM结果的支持。采用含氮量较高的LiPON电解液制备了TiO2阳极和LNMC阴极的杂化半电池。电池稳定的电化学性能表明,较高的界面宽度有利于在阳极-电解质界面处形成稳定的固体电解质界面层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Spectroscopic Ellipsometry Study of TiO2/LiPON and LNMC/LiPON Solid Electrode/Electrolyte Interfaces of Solid-State Batteries

Spectroscopic Ellipsometry Study of TiO2/LiPON and LNMC/LiPON Solid Electrode/Electrolyte Interfaces of Solid-State Batteries

In all-solid-state thin-film batteries, the interface properties between solid electrolytes and solid electrodes are the major factors limiting their performances; however, knowledge of the interface properties is limited in most of the cases. Using the magnetron sputtering technique, thin films of Li3+xPO4–xNx (LiPON) solid-state electrolyte along with LiPON/TiO2 (anode) and LiPON/LiNi0.33Mn0.33Co0.33O2 (LNMC) (cathode) thin-film bilayers have been prepared under different sputtering conditions and characterized by spectroscopic ellipsometry to study the properties of electrolyte/anode and electrolyte/cathode interfaces of Li-ion solid-state batteries. Spectroscopic ellipsometry, X-ray photoelectron spectroscopy, and secondary ion mass spectrometry studies of single-layer LiPON showed that radiofrequency (RF) power and nitrogen pressure used during deposition control the nitrogen and lithium contents of the film. Films deposited at a higher RF power showed a lower refractive index, which signifies a lower nitrogen content and a more Li3PO4-like film; impedance measurements also confirmed this result. The interface width found from the ellipsometric study of the LiPON/TiO2 and LiPON/LNMC bilayer films showed that the nitrogen content of the LiPON layer has a very strong effect on the interface as well as on the lithiation of the TiO2 layer during LiPON sputtering; higher nitrogen content in the LiPON layer increases both. This finding has also been supported by cross-sectional FESEM results. Hybrid half-cells of the TiO2 anode and LNMC cathodes have been prepared using a higher nitrogen content LiPON electrolyte. The stable electrochemical performance of the cells manifests that higher interface width favors the formation of a stable solid electrolyte interface layer at the anode–electrolyte interface.

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来源期刊
ACS Applied Energy Materials
ACS Applied Energy Materials Materials Science-Materials Chemistry
CiteScore
10.30
自引率
6.20%
发文量
1368
期刊介绍: ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.
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