Size effects of micro-pattern on lithium metal surface on the electrochemical performance of lithium metal secondary batteries
- Authors
- Park, Joonam; Kim, Dohwan; Jin, Dahee; Phatak, Charudatta; Cho, Kuk Young; Lee, Young gi; Hong, Seungbum; Ryou, Myung hyun; Lee, Yong min
- Issue Date
- Dec-2018
- Publisher
- Elsevier B.V.
- Keywords
- Lithium metal; Micro-pattern; Modeling; Plating and stripping; Secondary battery
- Citation
- Journal of Power Sources, v.408, pp.136 - 142
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Power Sources
- Volume
- 408
- Start Page
- 136
- End Page
- 142
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/7980
- DOI
- 10.1016/j.jpowsour.2018.09.061
- ISSN
- 0378-7753
- Abstract
- Two micro-patterns of different sizes (50 and 80 μm) are designed to have equivalent capacities of 1.06 and 2.44 mAh cm−2 by building a computational battery model. After preparing two stamps each possessing a micro-pattern design, the corresponding pattern is properly imprinted on the surface of 100 μm lithium metal, which is confirmed by scanning electron microscopy. When both micro-patterned lithium metals are electrochemically reduced and oxidized up to 1 mAh cm−2 in Li/Li symmetric cells at 1 or 2 mA cm−2, the 80 μm-patterned lithium shows a more stabilized lower overpotential during long-term cycling than the 50 μm-patterned and bare lithium, probably due to the lithium anchoring effect and a larger empty volume in the patterns. Additionally, an overflow of lithium deposits is easily observed in the 50 μm-patterned lithium metal, while the 80 μm-patterned lithium metal holds most of the lithium deposits within the patterns. When both micro-patterned lithium metals are assembled to full cells with a LiNi0·6Co0·2Mn0·2O2 cathode of 2 mAh cm−2, the 80 μm-patterned lithium metal shows much better electrochemical performances with stable plating/stripping behavior within the patterns. © 2018 Elsevier B.V.
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