Precursor for positive electrode of sodium-ion battery, and preparation method therefor and use thereof

By doping Co and Zr in the positive electrode precursor of the sodium ion battery to form a thin precipitation phase, the problem of structural instability and cracks of the positive electrode material during high voltage cycle is solved, and higher discharge specific capacity and better cycle stability are achieved.

WO2025039364A1PCT designated stage expired Publication Date: 2025-02-27JINGMEN GEM NEW MATERIAL CO LTD +1
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Patent Information

Application Number
PCT/CN2023/127758
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-08-23
Filing Date
2023-10-30
Publication Date
2025-02-27

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Abstract

A precursor for a positive electrode of a sodium-ion battery, and a preparation method therefor and the use thereof. The chemical formula of the precursor for a positive electrode of a sodium-ion battery is NiaCobZrcMn1-a-b-c(OH)2, wherein 0<a≤0.25, 0<b≤0.15, and 0<c≤0.15. In the precursor for a positive electrode of a sodium-ion battery, Co and Zr can eliminate order-disorder phase transition, inhibit the phase transition of a layered structure, regulate and control the interplanar spacing of the layered structure, and function as a "pillar" among layers to enhance the mechanical properties of a material.
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