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Size effects of micro-pattern on lithium metal surface on the electrochemical performance of lithium metal secondary batteries

Title
Size effects of micro-pattern on lithium metal surface on the electrochemical performance of lithium metal secondary batteries
Author
조국영
Keywords
Micro-pattern; Lithium metal; Plating and stripping; Modeling; Secondary battery
Issue Date
2018-12
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v. 408, Page. 136-142
Abstract
Two micro-patterns of different sizes (50 and 80 gm) 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 mu m 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 mu m-patterned lithium shows a more stabilized lower overpotential during long-term cycling than the 50 mu m-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 mu m-patterned lithium metal, while the 80 mu m-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 mu m-patterned lithium metal shows much better electrochemical performances with stable plating/stripping behavior within the patterns.
URI
https://www.sciencedirect.com/science/article/pii/S0378775318310310https://repository.hanyang.ac.kr/handle/20.500.11754/98867
ISSN
0378-7753; 1873-2755
DOI
10.1016/j.jpowsour.2018.09.061
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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