Sodium ion battery composite cathode material and preparation method thereof

By introducing neodymium-doped modified silicon hexaboride and niobium sulfide selenide into the cathode material of sodium-ion batteries, the problems of energy density and cycle life of the cathode material of sodium-ion batteries have been solved, and the synergistic improvement of high specific capacity and good rate performance has been achieved.

CN122117910APending Publication Date: 2026-05-29ZHEJIANG NANPAI NEW ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG NANPAI NEW ENERGY TECHNOLOGY CO LTD
Filing Date
2026-02-11
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Sodium-ion battery cathode materials suffer from low energy density and poor cycle life. Their structure is prone to harmful phase transitions during sodium ion insertion/extraction, leading to rapid material degradation. Existing single-element doping methods are insufficient to achieve synergistic optimization of energy density and cycle life.

Method used

Neodymium-doped modified silicon hexaboride and niobium sulfoselenide composite cathode material is used. By introducing the three-dimensional rigid structure of silicon hexaboride and the layered structure of niobium sulfoselenide, the conductivity and structural stability of the material are improved, and the volume expansion and harmful phase transition during the charging and discharging process are suppressed.

Benefits of technology

It significantly improves the specific capacity and rate performance of sodium-ion batteries, while optimizing cycle stability and extending the long-term service life of the electrodes.

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Abstract

The application belongs to the technical field of sodium ion batteries, and particularly relates to a sodium ion battery composite positive electrode material and a preparation method thereof. The preparation method comprises the following steps: dissolving soluble nickel salt, iron salt and manganese salt in an ammonia water solution, adjusting pH to 11-12, heating and reacting under a nitrogen atmosphere, and obtaining an oxide precursor after filtration, washing and drying; adding sodium carbonate, the oxide precursor, modified silicon hexaboride and niobium sulfoselenide into ethanol, ball-milling and mixing, drying, calcining and cooling to obtain the sodium ion battery composite positive electrode material. The sodium ion battery composite positive electrode material prepared by the application has high specific capacity, good rate performance and excellent cycle stability.
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