Positive electrode material and preparation method and application thereof

Through the double-layer coating technology, the positive electrode material of O3 phase core and P2 phase or amorphous phase coating layer is formed, which solves the problem of poor circulation and rate performance of existing sodium ion positive electrode materials at high temperatures, and significantly improves the structural stability and electrochemical properties of the material.

CN119725499APending Publication Date: 2025-03-28ZHUJI PAWA NEW ENERGY CO LTD
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Patent Information

Application Number
CN202510012140.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-06
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing layered structure sodium oxide positive electrode materials have poor circulation and rate performance at high temperatures, which affects their application prospects.

Method used

Using a double-layer cladding technology, a positive electrode material of O3 phase core and P2 phase or amorphous phase cladding layer is formed by combining primary and secondary cladding materials. The method includes mixing the precursor and the sodium source and then baking it once, then performing secondary baking with the primary coating material, and then performing three baking with the secondary coating material to produce the positive electrode material.

Benefits of technology

Through the double-layer cladding technology, the structural stability, cycle stability and rate performance of the positive electrode material are improved, the possibility of side reactions is reduced, and the post-structure advantages of the positive electrode material are maintained.

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Abstract

The invention belongs to the field of sodium ion battery materials, and discloses a positive electrode material which is prepared by the following steps: step 1, mixing a precursor and a sodium source, and performing primary roasting to obtain an intermediate product A; step 2, mixing the intermediate product A and a primary coating material, and performing secondary roasting to obtain an intermediate product B; and step 3, mixing the intermediate product B and the secondary coating material, and roasting for the third time to obtain the positive electrode material, the first coating material is M2-containing metal salt; the second coating material is any one of M3-containing metal salt and organic carbon; wherein M2 and M3 can be any one or more than two of Ni, Co, Mn, Cr, V, Zn, Mg, Al, Zr, W, Nb, Ti, Y, Mo, Ta, Sr, Ba and Cu, and M2 and M3 are different metal elements. The core of the positive electrode material provided by the invention is an O3 phase, so that the structural stability of the positive electrode material is improved; the first coating layer and the second coating layer are in a P2 phase or an amorphous phase, so that the prepared positive electrode material has the multiphase advantage, and the cycling stability and the capacity of the positive electrode material can be improved; the core structure is doubly protected by the first coating layer and the second coating layer, so that the possibility of contact between the inside and air is reduced, the possibility of side reaction is reduced, and the structural advantages of the improved positive electrode material are kept.
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