Lithium negative electrode with multi-layer composite artificial SEI (solid electrolyte interface) film as well as preparation method and application of lithium negative electrode

By using a lithium negative electrode with a multi-layer composite artificial SEI film in the lithium battery, the problems of lithium dendrites growth, low ion conductivity and poor stability are solved, and the high cycle performance, safety and efficiency of the lithium battery are achieved.

CN119673947AActive Publication Date: 2025-03-21TIANFU JIANGXI LAB
8 Cites 1 Cited by

Patent Information

Application Number
CN202411818728.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-21
Estimated Expiration
2044-12-11

AI Technical Summary

Technical Problem

During the charging and discharging process, lithium metal negative electrodes have problems such as lithium dendrites growth, low ion conductivity, poor stability and mechanical properties, resulting in limited battery cycle life, safety and energy density.

Method used

The lithium negative electrode with a multi-layer composite artificial SEI film is used to build a lithium-friendly sponge-type porous structure, which increases the lithium deposition space, inhibits the growth of lithium dendrites, and builds a high-stability, excellent ionic conductivity and mechanical strength artificial SEI layer through multifunctional inorganic composite materials.

Benefits of technology

It significantly improves the circulation performance, safety and overall efficiency of lithium batteries, extends the cycle life of the battery, improves the conductivity and mechanical strength of lithium ions, and reduces the irreversible loss of lithium metal.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a lithium negative electrode with a multi-layer composite artificial SEI film and a preparation method and application of the lithium negative electrode, and relates to the technical field of lithium batteries. Comprising a porous material, a lithium-loving layer, lithium metal and an inorganic composite material, a lithium-loving layer and lithium metal are sequentially deposited on one side of the porous material, and an inorganic composite material is deposited on the other side of the porous material; the porous material is at least one of a porous carbon material and a porous silicon material; the inorganic composite material is at least five of LiF, Li2O, Li3N, Li2CO3, Li2S, Li10GeP2S12 and Li3PO4, and the inorganic composite material is at least five of Li2CO3, Li2S, Li10GeP2S12 and Li3PO4. According to the invention, the lithium-loving sponge-like porous structure is constructed, the lithium deposition space is increased, the growth of lithium dendrites is effectively inhibited, the SEI layer is prevented from being punctured, and meanwhile, the artificial SEI layer with high stability, excellent ionic conductivity and mechanical strength is constructed by adopting the multifunctional inorganic composite material, so that the cycle performance, the safety and the overall efficiency of the lithium battery are improved.
Need to check novelty before this filing date? Find Prior Art