Layered positive electrode material of high-capacity sodium-ion battery as well as preparation method and application of layered positive electrode material

By adjusting the nickel-manganese ratio and preparation method, a NaNixFeyMn3+zMn4+lO2 structure coexisting Mn3+ and Mn4+ was prepared, which solved the stability and capacity of the O3-phase nickel-ferromanganese base layered positive electrode material, and achieved high capacity and high cycle stability Sodium ion battery layered cathode material.

CN119108547APending Publication Date: 2024-12-10TIANJIN UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN202411214382.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-31
Publication Date
2024-12-10

AI Technical Summary

Technical Problem

The existing O3-phase nickel, ferromanganese base layered cathode materials are difficult to achieve high capacity and high cycle stability due to sodium deintercalation and elemental devalence during the circulation process.

Method used

By adjusting the nickel-manganese ratio, NaNixFeyMn3+zMn4+lO2 structures in which Mn ions coexist in two valence states Mn3+ and Mn4+ are prepared. The direct solid phase calcination method is used to optimize the material composition, and combined with co-precipitation method and dry ball milling methods to ensure Mn3+ The stable phase structure and additional capacity contribute.

Benefits of technology

The sodium ion battery layered cathode material with high capacity and excellent cycle stability is achieved, improving the specific capacity and cycle performance of the material.

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Abstract

The invention discloses a high-capacity sodium ion battery layered positive electrode material and a preparation method and application thereof.The preparation method comprises the steps that a sodium source, a nickel source, an iron source and a manganese source are mixed to be uniform, and precursor powder is obtained; and sintering the precursor powder at 750-1050 DEG C for 6-48 hours, and cooling along with a furnace to obtain the high-capacity sodium-ion battery layered positive electrode material. Mn in the high-capacity sodium-ion battery layered positive electrode material coexists in two valence forms of Mn < 3 + > and Mn < 4 + >, Mn < 3 + > can contribute capacity as an electrochemical active element, and Mn < 4 + > can stabilize a lattice structure as an electrochemical inactive element; therefore, the sodium-ion battery prepared from the high-capacity sodium-ion battery layered positive electrode material has high specific capacity and excellent cycling stability.
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