Synergistically enhanced LiF–rich protective layer for highly stable silicon anodes

Applied Surface Science(2024)

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Silicon (Si) is considered as one of the most promising anode materials with an extremely high specific capacity of 3579 mAh/g, which is beyond the limit of conventional graphite anodes in lithium (Li) ion batteries (LIBs). However, the large volume changes during the lithiation/delithiation process and the 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 (AlF3) 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 the AlF3 and the PAA in the LPL, a LiF-rich SEI layer with robust physicochemical properties is uniformly formed at the interface between the anode and electrolyte. As a result, the LPL coated Si (LPL@Si) anode exhibits outstanding electrochemical properties. A full-cell prepared with the LPL@Si anode and LiNi0.8Co0.1Mn0.1O2 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.
Lithium fluoride,Solid electrolyte interphase,Silicon anode,Lithium ion battery,Protective layer
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