Suppression of formation of lithium dendrite via surface modification by 2-D lithium phosphorous oxynitride as a highly stable anode for metal lithium batteries
- Authors
- Ko, Jaehwan; Cho, Do Hyun; Kim, Dong-Joo; Yoon, Young Soo
- Issue Date
- Dec-2020
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Cycle performance; Lithium dendrite; Lithium metal batteries; Lithium phosphorus oxynitride; Lithium protective layer
- Citation
- Journal of Alloys and Compounds, v.845
- Journal Title
- Journal of Alloys and Compounds
- Volume
- 845
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/78255
- DOI
- 10.1016/j.jallcom.2020.156280
- ISSN
- 0925-8388
- Abstract
- 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. © 2020
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