Suppression of formation of lithium dendrite via surface modification by 2-D lithium phosphorous oxynitride as a highly stable anode for metal lithium batteries

Lithium phosphorous oxynitride (LiPON) is a thin film solid electrolyte with an amorphous structure and is the most applied material in the thin film battery industry. Herein, LiPON and LiPON/LiPO thin films were directly deposited on a Li foil by the RF sputtering method and evaluated as a protecti...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-12, Vol.845, p.156280, Article 156280
Main Authors: Ko, Jaehwan, Cho, Do Hyun, Kim, Dong-Joo, Yoon, Young Soo
Format: Article
Language:English
Subjects:
Amorphous materials
Anodes
Anodic protection
Cycle performance
Cycles
Dendritic structure
Electrolytic cells
Foils
Ion currents
Lithium
Lithium batteries
Lithium compounds
Lithium dendrite
Lithium metal batteries
Lithium phosphorus oxynitride
Lithium protective layer
Photoelectrons
Solid electrolytes
Stability analysis
Thickness
Thin films
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Summary:Lithium phosphorous oxynitride (LiPON) is a thin film solid electrolyte with an amorphous structure and is the most applied material in the thin film battery industry. Herein, LiPON and LiPON/LiPO thin films were directly deposited on a Li foil by the RF sputtering method and evaluated as a protective film to improve the stability of the Li anode. The structural properties of the LiPON and LiPO thin films were confirmed by analytical methods, such as X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, and the ionic conductivity of both thin films was confirmed. Based on these results, cycling evaluation, using Li│Li symmetric cells and LiCoO2│Li cells, confirmed the performance of LiPON and LiPON/LiPO thin films as Li anode protective films. In the cycling evaluation of Li│Li symmetric cells, according to the thickness of the LiPON thin film, the thickness of 200 nm produces the best stability and performance. The 200-nm-thick LiPON protection film and 200-nm-thick LiPON/LiPO protection film were shown to improve the stability of the Li anode in the cycling evaluation of Li│Li symmetric cells and LiCoO2│Li cells. •Lithium dendrite was inhibited by LiPON protective layer.•The structural properties of protective films are analyzed by XRD, SEM, and XPS.•The electrochemical properties of protective films are evaluated by test cells.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.156280