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.
关键词
锂离子电池/硅负极/固体电解质相界面/共价有机骨架/表面修饰
Key words
lithium ion batteries/silicon anode/solid electrolyte intermediate phase/covalent organic framework/surface modification
维普
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