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Sodium-ion battery positive plate, preparation method thereof and sodium-ion battery

A sodium-ion battery and cathode sheet technology, applied in electrode manufacturing, battery electrodes, electrode current collector coating, etc., can solve the problems of affecting the contact of cathode materials, loose electrode structure, and residues, etc., to improve the volumetric energy density. , The effect of reducing the thickness of the battery and reducing the consumption

Inactive Publication Date: 2021-05-07
SO-FUN TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this type of sodium supplement additive is that there is residue after the reaction
The gas residues can easily cause the structure of the pole piece to loosen and collapse, which will affect the contact between the positive electrode materials.

Method used

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  • Sodium-ion battery positive plate, preparation method thereof and sodium-ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a sodium ion battery, the preparation method of which is as follows:

[0031] 1) Preparation of positive electrode sheet:

[0032] After adding PVDF positive electrode binder into N-methylpyrrolidone (NMP) solvent to make a glue, add acetylene black positive electrode conductive agent, super-P positive electrode conductive agent, Na 3 V(PO4) 3 The positive electrode active material is uniformly dispersed to obtain the positive electrode slurry, and then the slurry is evenly coated on the surface of the carbon-coated aluminum foil current collector with a coater, and dried; wherein, Na 3 V(PO4) 3 The mass ratio of :acetylene black:super-P:PVDF is 90:2.5:2.5:5.

[0033] Add PVDF adhesive to NMP solvent to make a glue, then add Na 2 C 2 o 2 N 2 Sodium supplement additive, evenly dispersed to get Na 2 C 2 o 2 N 2 Sodium additive slurry, followed by spreading Na 2 C 2 o 2 N 2 The sodium supplement additive slurry is uniformly coated on...

Embodiment 2

[0037] This embodiment provides a kind of sodium ion battery, and the difference from embodiment 1 is the preparation of positive electrode sheet:

[0038] After adding PVDF positive electrode binder into N-methylpyrrolidone (NMP) solvent to make a glue, add acetylene black positive electrode conductive agent, super-P positive electrode conductive agent, Na 3 V(PO4) 3 The positive electrode active material is uniformly dispersed to obtain the positive electrode slurry, and then the slurry is evenly coated on the surface of the carbon-coated aluminum foil current collector with a coater, and dried; wherein, Na 3 V(PO4) 3 The mass ratio of :acetylene black:super-P:PVDF is 90:2.5:2.5:5.

[0039] Add PVDF adhesive to NMP solvent to make a glue, then add Na 2 C 2 o 4 Sodium supplement additive, evenly dispersed to get Na 2 C 2 o 4 Sodium additive slurry, followed by spreading Na 2 C 2 o 4 The sodium supplement additive slurry is uniformly coated on the surface of the pos...

Embodiment 3

[0042] This embodiment provides a kind of sodium ion battery, and the difference from embodiment 1 is the preparation of positive electrode sheet:

[0043] After adding PVDF positive electrode binder into N-methylpyrrolidone (NMP) solvent to make a glue, add acetylene black positive electrode conductive agent, super-P positive electrode conductive agent, Na 3 V(PO4) 3 The positive electrode active material is uniformly dispersed to obtain the positive electrode slurry, and then the slurry is evenly coated on the surface of the carbon-coated aluminum foil current collector with a coater, and dried; wherein, Na 3 V(PO4) 3 The mass ratio of :acetylene black:super-P:PVDF is 90:2.5:2.5:5.

[0044] Add PVDF adhesive to NMP solvent to make a glue, then add Na 2 CO 3 Sodium supplement additive, evenly dispersed to get Na 2 CO 3 Sodium additive slurry, followed by spreading Na 2 CO 3 The sodium supplement additive slurry is uniformly coated on the surface of the positive pole p...

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Abstract

The invention belongs to the technical field of sodium ion batteries, and relates to a sodium ion battery positive plate. The sodium ion battery positive plate comprises a positive current collector, a positive active material layer and a sodium supplement additive layer; the positive active material layer is arranged on at least one surface of the positive current collector; the sodium supplement additive layer is arranged on at least one surface of the positive active material layer; and the sodium supplement additive layer comprises a sodium supplement additive, and the residue of the sodium supplement additive obtained an electrochemical reaction is gas. According to the sodium-ion battery positive plate disclosed by the invention, the sodium supplementing additive layer is uniformly distributed on the surface of the positive active material layer; and the sodium supplementing additive in the sodium-supplementing additive layer can reduce the consumption of reversible sodium ions, so that the energy density of the sodium-ion battery can be improved. The product of the sodium supplement additive after electrochemical reaction is gas and is distributed on the surface of the positive plate, and the residual component can be removed by a degassing process after high-temperature formation in the battery production process, and does not generate side reaction with the electrode plate to influence the electrochemical performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a sodium ion battery, a preparation method thereof, and a sodium ion battery. Background technique [0002] Sodium-ion batteries have broad application prospects in the field of energy storage due to their advantages such as rich sodium resources, low cost, and good safety performance. Their working principle is similar to that of lithium-ion batteries. Come out to realize the storage and release of energy. However, during the first charge and discharge process of a sodium-ion battery, a part of the sodium ions will be consumed due to the formation of a solid electrolyte film (SEI film) at the negative electrode, resulting in the loss of the positive electrode material sodium, thus reducing the energy density of the battery. [0003] In view of the above problems, in order to improve the energy density of Na-ion batteries, it is necessary to supplement Na-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/054H01M10/42H01M4/04
CPCH01M4/0404H01M4/667H01M10/054H01M10/4235Y02E60/10
Inventor 聂阳张倩徐雄文袁依婷
Owner SO-FUN TECH CORP LTD
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