Journal
JOURNAL OF POWER SOURCES
Volume 408, Issue -, Pages 136-142Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.09.061
Keywords
Micro-pattern; Lithium metal; Plating and stripping; Modeling; Secondary battery
Funding
- international Collaborative Energy Technology RAMP
- D Program of the Korea Institute of Energy Technology Evaluation and Planning from the Ministry of Trade, Industry AMP
- Energy, Republic of Korea [20158510050020]
- Technology Innovation Program - Ministry of Trade, Industry and Energy [10067183]
- DGIST Supercomputing and Bigdata Center
- National Research Foundation of Korea [22A20153313053, 22A20130012456] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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