Sodium-ion battery negative electrode pre-sodium modification method and sodium-ion battery negative electrode pre-sodium modification device
By physically combining the sodium metal powder with the negative electrode sheet of the sodium ion battery and pre-sodiumization using heating and spraying processes, the problem of initial Coulomb efficiency of the negative electrode material is solved, and the battery energy density and cycle life are improved.
CN119650595AInactive Publication Date: 2025-03-18ANSTEEL BEIJING RES INST CO LTD
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Patent Information
- Application Number
- CN202411644698.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-03-18
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Technical Problem
The initial Coulombic efficiency of the negative electrode material of sodium ion battery is low, limiting the improvement of battery energy density and cycle life.
Method used
By physically combining the sodium metal powder with the negative electrode sheet, the sodium metal is pre-embedded in the electrode sheet by heating and spraying processes to achieve pre-sodiumization. The method includes heating the negative electrode sheet, spraying the sodium metal powder solution, and pressurizing the treatment in an inert gas.
Benefits of technology
It improves the first Coulomb efficiency of the negative electrode material, improves the energy density and cycle life of the battery, and simplifies operation, has a wide range of application and can be continuously pre-sodiumized.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to a sodium ion battery negative electrode pre-sodium modification method and device, the pre-sodium modification operation is carried out in inert gas, and the method comprises the following steps: heating a negative electrode plate; spraying a sodium metal powder solution on the heated negative pole piece; and pressurizing the negative pole piece. The method has the advantages that the negative pole piece is heated, so that the organic solvent can be quickly removed, and the influence of residues on the electrochemical performance of the negative pole piece is reduced; the pole piece compounded with the sodium metal is rolled, so that the electric contact between the sodium metal and the pole piece can be increased, and the pre-sodium modification effect is improved; in the process that sodium metal powder is in direct contact with a pole piece for pre-sodium modification, if the added sodium metal powder is too little, the pre-sodium modification effect is not obvious, and if the added sodium metal powder is too much, excessive sodium can promote growth of sodium dendrites and cause safety problems, so that the adding amount of the sodium metal is very important; the pre-sodium modification degree can be quantitatively controlled by controlling the concentration of the sodium metal powder solution.
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