High-entropy layered oxide material and preparation method and application thereof

By forming a stable Na0.67XO2 interface protective layer on the surface of the positive electrode material of the sodium ion battery, combined with the advantages of P2 and O3 phases, a high-entropy layered oxide material was prepared, which solved the problem of poor stability of the positive electrode material when exposed to air, and significantly improved the cycling and rate performance of the battery.

CN119674050AActive Publication Date: 2025-03-21HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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Patent Information

Application Number
CN202510198998.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-24
Publication Date
2025-03-21
Estimated Expiration
2045-02-24

AI Technical Summary

Technical Problem

The layered oxide positive electrode material of sodium ion batteries has poor stability when exposed to air, resulting in surface residual alkali formation, lattice oxygen escape and phase transition, affecting the material structure and battery performance.

Method used

The high-entropy layered oxide material Na0.9Ni0.2Fe0.2Mn0.2Co0.2Ti0.2-aMaO2@Na0.67XO2 is used to form a uniform and stable Na0.67XO2 interface protective layer on the surface of the material through a preparation method combining solid phase method and liquid phase method. Combining the advantages of P2 and O3 phases, the electrochemical performance of the battery positive electrode material is enhanced.

Benefits of technology

The cycle performance and rate performance of the battery positive electrode material have been significantly improved. The first Kulun efficiency has reached 98%, and the retention rate has been 88% after 300 cycles, while improving the energy density and rate performance.

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Abstract

The invention discloses a high-entropy layered oxide material and a preparation method and application thereof, the chemical general formula of the material is Na < 0.9 > Ni < 0.2 > Fe < 0.2 > Mn < 0.2 > Co < 0.2 > Ti < 0.2-a > MaO < 2 > (at) Na < 0.67 > XO < 2 >, the inner core is a Na < 0.9 > Ni < 0.2 > Fe < 0.2 > Mn < 0.2 > Co < 0.2 > Ti < 0.2-a > MaO < 2 > material, and the surface is a Na < 0.67 > XO < 2 > material; m is one or more of zinc, copper and aluminum, X is one or more of nickel, iron, manganese and cobalt, and a is larger than or equal to 0.05 and smaller than or equal to 0.1. The preparation method of the material comprises a solid phase method and a liquid phase method, and the high-entropy layered oxide material is used for a sodium ion secondary battery. The material structure stability is effectively improved, so that the cycle life of the sodium ion battery is prolonged.
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