Fe-Sn modified composite Li negative electrode material as well as preparation method and application thereof

By preparing Fe-Sn modified composite Li anode material in lithium metal batteries, a high ionic conductivity and mechanically stable interface layer is formed, which solves the safety hazards and electrode structure damage caused by lithium dendrites, and improves the cycle life and performance stability of the battery.

CN121964539APending Publication Date: 2026-05-01SHAANXI UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610096305.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-23
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Problems include short-circuit safety hazards caused by lithium dendrites in lithium metal batteries, electrode structure damage, repeated damage to unstable SEI films, and HF corrosion of battery components.

Method used

The Fe-Sn modified composite Li anode material forms a composite interface layer on the lithium metal surface. FeF3 and SnF2 react under electrochemical conditions to generate LiF/Fe structure and Sn nanoparticles, forming an interface layer with high ionic conductivity, mechanical stability and flexible SEI film, which buffers volume changes.

Benefits of technology

It promotes uniform lithium deposition, inhibits dendrite formation, improves coulombic efficiency, extends battery life, reduces interfacial impedance, prevents battery corrosion, and enhances overall battery performance.

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Abstract

The invention discloses a Fe-Sn modified composite Li negative electrode material and a preparation method and application thereof, and belongs to the technical field of lithium metal batteries, the preparation method comprises the following steps: step A, adding triethylamine and fluoroethylene carbonate into ethylene glycol dimethyl ether, and stirring to obtain a composite solvent; b, FeF3 and SnF2 are added into the composite solvent obtained in the step A, heating and stirring are conducted, and Fe-Sn composite liquid is obtained; and step C, dropping the Fe-Sn composite liquid obtained in the step B on the surface of a lithium sheet, and standing to obtain the Fe-Sn modified composite negative electrode Li material, so as to solve the technical problems that lithium dendrites cause short-circuit potential safety hazards, the electrode structure is damaged by sudden change of lithium volume, the cycle life is shortened, lithium consumption and performance degradation are intensified by repeated damage of an unstable SEI film, and HF is generated by reaction to corrode a battery assembly.
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