Polyanionic precursor, sodium-ion battery positive electrode material, preparation method of sodium-ion battery positive electrode material, sodium-ion battery and power-related equipment
By using a polyanionic precursor with the chemical formula Mm+nM’wPxOy·zH2O, the problems of low capacity of existing polyanionic positive electrode materials and high impurity content in the production process are solved, and a high capacity, low impurity and environmentally friendly positive electrode material preparation is achieved.
CN119637827APending Publication Date: 2025-03-18CNGR ADVANCED MATERIAL CO LTD
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Patent Information
- Application Number
- CN202410845530.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-09-15
- Filing Date
- 2024-06-27
- Publication Date
- 2025-03-18
AI Technical Summary
Technical Problem
The existing polyanionic cathode materials have problems such as many miscellaneous, low capacity, and uneven mixing and high purity requirements during the production process, resulting in low energy density and compaction density.
Method used
A polyanionic precursor with the general chemical formula of Mm+nM’wPxOy·zH2O is used to maintain charge balance by selecting suitable values of M, M’, m, n, w, x, and y to prepare a positive electrode material with high purity and high compaction density.
Benefits of technology
It has achieved a positive electrode material with high capacity, good circulation performance and low impurity content, and does not produce harmful gases during the production process, and is environmentally friendly.
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Abstract
The invention provides a polyanionic precursor, a sodium-ion battery positive electrode material, a preparation method of the sodium-ion battery positive electrode material, a sodium-ion battery and electric equipment, and relates to the field of sodium-ion batteries. The polyanionic precursor contains a substance with a chemical general formula of Mm + nM'wPxOy.zH2O, the preparation method of the polyanionic precursor comprises the following steps: taking a metal salt containing M and / or M 'and a phosphorus source containing pyrophosphate as raw materials of the polyanionic precursor, dissolving and mixing the raw materials to obtain a mixed solution, and carrying out reaction and solid-liquid separation to obtain the polyanionic precursor. The polyanionic precursor is large in specific surface area, and the prepared sodium ion battery positive electrode material is high in purity and excellent in electrochemical performance.
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