Lithium-rich all-solid-state battery and preparation method and application thereof

By setting a lithium layer on the surface of the particles of the lithium-rich manganese-based positive electrode material and combining it with a solid electrolyte with a halide, the challenges of the lithium-rich manganese-based positive electrode material in terms of electrochemical performance and interface stability are solved, and excellent electrochemical performance and high capacity retention are achieved.

CN119725699APending Publication Date: 2025-03-28BEIJING CHUANGNENG HUITONG TECH CO LTD +1
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Patent Information

Application Number
CN202411933751.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

Lithium-rich manganese-based cathode materials have challenges in electrochemical properties and interface stability, including low electron conductivity, lattice structure changes and interface instability caused by high operating voltages.

Method used

The modified positive electrode material is formed by sequentially providing a first lithium layer (lithium oxide and/or lithium hydroxide) and a second lithium layer (lithium phosphate) on the surface of the lithium-rich manganese-based positive electrode material particles, and combined with the suitable halide solid electrolyte. This method ensures that the lithium layer is not damaged during assembly and allows lithium ions to diffuse and blocks electron transfer.

Benefits of technology

The electrochemical performance of lithium-rich manganese-based positive electrode material is improved, and excellent electrochemical window and high capacity retention are achieved, ensuring the interface stability and overall performance of the battery.

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Abstract

The invention discloses a lithium-rich all-solid-state battery and a preparation method and application thereof.The lithium-rich all-solid-state battery comprises a positive pole piece, a solid electrolyte and a negative pole piece which are sequentially extruded and assembled, and a positive pole material of the positive pole piece comprises modified lithium-rich manganese-based positive pole material particles and a conductive agent, the modified lithium-rich manganese-based positive electrode material particle comprises a lithium-rich manganese-based positive electrode material particle and a first lithium layer and a second lithium layer which are sequentially arranged on the surface of the lithium-rich manganese-based positive electrode material particle, the first lithium layer comprises lithium oxide and / or lithium hydroxide, and the second lithium layer is lithium phosphate; the solid electrolyte is halide solid electrolyte. The positive electrode material of the all-solid-state battery has good interface contact with the solid electrolyte, the battery has excellent electrochemical performance, and the excellent effects of wide electrochemical window and high capacity retention ratio are achieved.
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