Studies on covalent organic framework derived stable SEI film on silicon surface
Dramatic volume changes,particle fragmentation and the continuous damage and recon-struction of the solid electrolyte interface(SEI)film for Si anode seriously hinder its wide use in lithium ion batteries.Herein,a novel electro-active covalent organic framework(COF)material was used to decorate nano Si surface and a high-performance silicon anode material was obtained.On the one hand,the decorated COF layer can effectively buffer the volume expansion of silicon particles.On the other hand,the COF layer helps to tailor the composition of SEI by inducing the generation of more LiF and LiN species.Therefore,the Si particles are well protected and the cycling stability of the Si anode is significantly enhanced.The unique COF decoration broadens the concepts for interfa-cial engineering for electrode materials in lithium ion batteries.
lithium ion batteriessilicon anodesolid electrolyte intermediate phasecovalent organic frameworksurface modification
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