期刊
CELL REPORTS PHYSICAL SCIENCE
卷 2, 期 10, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.xcrp.2021.100597
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资金
- US Department of Energy Office of Basic Energy Sciences [DE-SC0002357]
- National Science Foundation [ECCS-1542148]
- National Science Foundation through the UC Irvine Materials Research Science and Engineering Center [DMR-2011967]
- National Science Foundation Major Research Instrumentation Program [CHE-1338173]
The continuous growth of the SEI is found to be the dominant factor for lithium inventory loss during cycling, with only a marginal increase in trapped Li-Si alloy. This study offers a quantitative approach to differentiate Li in the SEI from trapped Li in Li-Si alloy, providing unique insights into identifying critical bottlenecks for developing Si anodes.
Silicon with a high theoretical capacity (3,579 mAh/g) is a promising anode candidate for lithium-ion batteries. However, commercialization is still impeded by low Coulombic efficiency, caused by solid electrolyte interphase (SEI) formation and trapped lithium (Li)-silicon (Si) alloy during repeated volume change. Quantifying capacity losses from each factor is crucial to formulate rational design strategies for further improvement. In this work, titration-gas chromatography and cryogenic transmission electron microscopy are applied to characterize the evolution of trapped Li-Si alloy and SEI growth in a silicon thin-film anode It is found that continuous growth of the SEI is the dominant factor for lithium inventory loss during cycling, with only a marginal increase in trapped Li-Si alloy. This study offers a quantitative approach to differentiate Li in the SEI from trapped Li in Li-Si alloy through a silicon thin-film anode, providing unique insights into identifying critical bottlenecks for developing Si anodes.
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