Synergistically enhanced LiF-rich protective layer for highly stable silicon anodes
- Authors
- Lee, Dongsoo; Lee, Seungho; Jung, Dae Soo; Roh, Kwang Chul; Seo, Jihoon; Kim, Junghwan; Kim, Kwanghyun; Kim, Patrick Joohyun; Choi, Junghyun
- Issue Date
- Jul-2024
- Publisher
- ELSEVIER
- Keywords
- Lithium fluoride; Solid electrolyte interphase; Silicon anode; Lithium ion battery; Protective layer
- Citation
- APPLIED SURFACE SCIENCE, v.661
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 661
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/91599
- DOI
- 10.1016/j.apsusc.2024.160023
- ISSN
- 0169-4332
1873-5584
- Abstract
- Silicon (Si) is considered as one of the most promising anode materials with an extremely high specific capacity (3579 mAh/g), which is beyond the limit of conventional graphite anodes in lithium (Li) ion batteries (LIBs). However, large volume changes during the lithiation/delithiation process and formation of an unstable solid electrolyte interface (SEI) layer hinder the practical application of Si anodes. To address these issues, constructing a stable protective layer at the interface between anode and electrolyte is a desirable strategy. In this study, a LiF-rich SEI inducing protective layer (LPL) comprising aluminum fluoride (AlF 3 ) and poly(acrylic acid) (PAA) is introduced onto Si anode to construct a stable LiF-rich SEI layer and mitigate the volume changes of the Si anodes during cycling. Owing to the synergetic effects of AlF 3 and PAA, a LiF-rich SEI layer with robust physicochemical properties is uniformly formed on the Si anode. As a result, the LPL coated Si (LPL@Si) anodes exhibit outstanding electrochemical properties in Li metal cell tests. In addition, a full-cell prepared with the LPL@Si anode and LiNi 0.8 Co 0.1 Mn 0.1 O 2 as a cathode exhibits an excellent cycling performance and mitigated volume changes, demonstrating the potential of this strategy to protect the Si anodes for the development of high-energy-density LIBs.
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