High-performance all-solid-state battery and preparation method thereof

By introducing a composite functional layer of elemental metal and polyethylene oxide into the all-solid-state battery, and using an ionic liquid and lithium salt modification layer at the interface, the interfacial compatibility problem between the positive electrode and the solid electrolyte is solved, the ionic conductivity and cycle stability of the battery are improved, and the battery impedance and short-circuit risk are reduced.

CN115411376BActive Publication Date: 2026-06-26SHENZHEN JIECHUANG NEW ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHENZHEN JIECHUANG NEW ENERGY CO LTD
Filing Date
2022-08-30
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing all-solid-state batteries, the interface compatibility between the positive electrode, negative electrode and solid electrolyte is poor, resulting in low ionic conductivity at the interface and short battery cycle life.

Method used

The structure consists of a lithium metal anode, a composite functional layer, a solid electrolyte ceramic sheet, an ionic liquid-lithium salt modification layer, and a positive electrode sheet, arranged sequentially from top to bottom. The composite functional layer includes elemental metal and polyethylene oxide, and the positive electrode sheet includes a lithium-rich manganese-based positive electrode material coated with a solid electrolyte. An ionic liquid and a lithium salt modification layer are introduced at the interface to improve interfacial contact.

Benefits of technology

It improves the interfacial contact between the positive electrode and the solid electrolyte ceramic sheet, reduces the overall battery impedance, enhances battery capacity and cycle stability, reduces the possibility of lithium dendrite growth, and extends battery life.

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Abstract

The application discloses a high-performance all-solid-state battery and a preparation method thereof. The high-performance all-solid-state battery comprises, from top to bottom, a metal lithium negative electrode, a composite functional layer, a solid electrolyte ceramic sheet, an ionic liquid-lithium salt modified layer and a positive electrode sheet. The lithium-rich manganese-based positive electrode material coated with the solid electrolyte is used as the positive electrode material, so that the cycle stability and the rate performance of the material are improved. The ionic liquid and the lithium salt compound are introduced at the interface between the positive electrode sheet and the solid electrolyte ceramic sheet, and the composite functional layer is introduced at the interface between the negative electrode and the solid electrolyte ceramic sheet, so that the interface contact of the positive electrode, the negative electrode and the solid electrolyte ceramic sheet is improved, better ionic conductivity and lower overall impedance of the battery are obtained, the metal single element added in the composite functional layer can swallow the lithium dendrite grown in the cycle process of the metal lithium negative electrode, the polarization voltage and the short circuit possibility of the battery are reduced, and the cycle stability of the battery is improved.
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