期刊
APL MATERIALS
卷 10, 期 1, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0077036
关键词
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资金
- Vehicle Technologies Office of the U.S. Department of Energy, under the Silicon Consortium Program
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Key R and D Program of China [2017YFF0210703]
Silicon suboxide (SiOx) is a promising anode material for lithium-ion batteries, but it suffers from severe capacity fading during cycling. This study investigates the fading mechanisms of SiOx anode materials, revealing the role of surface instability.
Silicon suboxide (SiOx) is one of the promising anode materials for the next-generation lithium-ion batteries. However, SiOx has a severe capacity fading problem during cycling. It is thus desired to investigate the detailed fading mechanisms of SiOx anode materials. In this study, limited capacity cycling was employed to examine the electrochemical behaviors of the SiOx anode, and the lithiation/delithiation cycling was limited within a range of 10% theoretical capacity. This strategy minimizes the volume variation of SiOx materials upon charging/discharging, which helps to reveal their decay factors other than volume fluctuation. It is demonstrated that the instability of the SiOx surface during cycling was likely a parallel factor of active material fading, which seems to cause unfavored electrode interface rearrangements with lowered electric conductivity. (C) 2022 Author(s).
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