一种核壳结构型钠离子电池正极材料及制备方法

By employing a core-shell structure design in the cathode material of sodium-ion batteries and utilizing surface pre-oxidation treatment to form an oxide buffer layer, the problem of uneven stress distribution caused by inconsistent volume changes was solved, improving the cycle stability of the material and the sodium ion conduction efficiency, thus achieving high specific capacity and good cycle performance.

CN116344731BActive Publication Date: 2026-07-17安徽得壹能源科技有限公司
View PDF 4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
安徽得壹能源科技有限公司
Filing Date
2023-03-28
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing layered transition metal oxide sodium-ion battery cathode materials, uneven stress distribution caused by inconsistent volume changes during cycling leads to microcracks, affecting sodium ion conduction and causing electrochemical performance degradation.

Method used

The core-shell structure design is adopted. The core precursor particles are generated by co-precipitation under a protective atmosphere. Then, the surface is pre-oxidized to form an oxide layer. The shell is generated by co-precipitation under an air atmosphere. The core-shell structure precursor is formed and then high-temperature solid-state sintering is performed to form an oxide buffer layer between the core and the shell.

Benefits of technology

It improves the cycle stability and sodium ion transport rate of the cathode material in sodium-ion batteries, enhances specific capacity and rate performance, and has a simple process, low cost, and is easy to mass-produce.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN116344731B_ABST
    Figure CN116344731B_ABST
Patent Text Reader

Abstract

本发明属于钠离子电池技术领域，涉及钠离子电池正极材料，具体涉及一种核壳结构型钠离子电池正极材料及制备方法。在保护气氛条件下，采用A金属盐溶液、第一沉淀剂和第一络合剂进行一次共沉淀，生成第一前驱体颗粒；采用空气对一次共沉淀完成后的反应体系进行表面预氧化处理，使得反应体系内的第一前驱体颗粒表面形成氧化层，生成第二前驱体颗粒；将表面预氧化处理后的气氛条件改变为保护气氛条件，加入B金属盐溶液、第二沉淀剂和第二络合剂进行二次共沉淀，生成核壳结构前驱体颗粒；将核壳结构前驱体颗粒与钠盐混合后进行高温固相烧结，即得。本发明通过在内核与外壳之间设置缓冲层(氧化层)，能够改善钠离子电池层状正极材料的循环稳定性。
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Modified ternary lithium ion battery positive electrode material and preparation method and application thereof

    CN113745484A

  • A high-nickel ternary cathode material and its preparation method

    CN114933335A

  • Positive electrode material precursor, preparation method thereof and positive electrode material

    CN115520904A

  • Nickel-iron-manganese ternary precursor as well as preparation method and application thereof

    CN115818737A