Negative-electrode-free Prussian blue-based sodium ion battery

CN119481229APending Publication Date: 2025-02-18DONGGUAN UNIV OF TECH
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Patent Information

Application Number
CN202411582166.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-07
Publication Date
2025-02-18

AI Technical Summary

Technical Problem

The negative electrode sheets of existing sodium ion batteries contain a large amount of hard carbon materials, resulting in high manufacturing costs and limiting the widespread application of sodium ion batteries.

Method used

Using a Prussian blue-based sodium ion battery design without negative electrodes, the aluminum foil is etched in a mixed solution containing HCl and Al2 (SO4)3 to form porous aluminum foil, and deposit it on its surface to form a carbonaceous conductive particle film, replacing the traditional negative pole piece.

Benefits of technology

This design greatly reduces the use of negative electrode active substances, reduces the cost of use, improves the wettability of the electrolyte and the adhesion of carbonaceous conductive particles, significantly improves the volume energy density of the entire battery, and reduces the cost by more than 40%.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a Prussian blue-based sodium ion battery without a negative electrode. The sodium ion battery disclosed by the invention does not contain a traditional negative pole piece, and the treated aluminum foil is used for replacing the traditional negative pole piece; specifically, carbonaceous conductive particles such as activated carbon and SP materials with the thickness of 50-300 microns can be coated or deposited on the surface of the aluminum foil through chemical etching treatment; the chemical etching treatment can improve the specific surface area and roughness of the aluminum foil and reduce the interface resistance, so that the activated carbon and the aluminum foil are meshed with each other, the contact effect of the activated carbon and the aluminum foil is improved, and compared with the traditional carbon-coated aluminum foil, the surface of the formed carbonaceous conductive particle film bears sodium ions from a positive electrode; an aluminum foil current collector of more than 10 microns is arranged in a conventional negative-electrode-free Prussian blue-based sodium ion battery negative electrode plate, a hard carbon material of 100-300 microns is coated, the hard carbon material can be removed, the space of the negative electrode material can be greatly saved, and the volume energy density of the battery is greatly improved.
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Citation Information

Patent Citations

  • Efficient continuous preparation method of Prussian blue compound

    CN116873951A