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Aqueous battery pole piece material, aqueous battery pole piece and preparation method and application thereof

A battery pole piece, water system technology, applied in electrode manufacturing, battery electrode, electrode rolling/calendering, etc., can solve the problem that the surface density and compaction density of the pole piece are not effectively controlled, the active material loading is small, and the battery stability Influence and other problems, to achieve the effect of reducing process steps and time, improving uniformity and high consistency

Active Publication Date: 2022-05-17
NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As energy storage batteries are widely used in new energy industries such as photovoltaics and wind power, water-based ion batteries have broad development prospects as energy storage batteries; Coating process, the active material loading of the produced pole piece is small (0.3~0.5g / cm 2 ), and the amount of auxiliary materials is large; in the prior art, there is also forming by rolling. In the rolling process, the raw material is usually rolled by a rolling machine for many times, and then rolled together with the current collector. Although this process The required pole piece load can be achieved, but due to the shape and weight of the viscoelastic raw material in the production operation, the surface density and compaction density of each pole piece have not been effectively controlled, and the weight of each pole piece has A certain gap, resulting in a certain impact on the stability of the subsequent battery

Method used

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  • Aqueous battery pole piece material, aqueous battery pole piece and preparation method and application thereof
  • Aqueous battery pole piece material, aqueous battery pole piece and preparation method and application thereof
  • Aqueous battery pole piece material, aqueous battery pole piece and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0101] Embodiment 1 prepares polyimide active material 1

[0102]Using N-methylpyrrolidone as a solvent, add 1,4,5,8-naphthalene tetracarboxylic anhydride and anhydrous ethylenediamine to the solvent at a molar ratio of 1:1.02 for reaction; the reaction vessel is a glass flask, Under the protection of argon, the reactant was kept at 150° C. for 5 hours, and the product was collected and vacuum-dried at 120° C. to obtain a dry powder, which was designated as polyimide active material I.

Embodiment II

[0103] Embodiment II prepares polyimide active material II

[0104] Add the reactants 1,4,5,8-naphthalene tetracarboxylic dianhydride and ethylenediamine into the reactor at a molar ratio of 1:1, and the reaction vessel is a glass flask. The reactant was kept at 90° C. for 2 hours under the protection of argon, then raised to 150° C., and reacted at this temperature for 4 hours. The resultant was collected and kept at 200° C. under vacuum for 24 hours to obtain a dry powder, which was designated as polyimide active material II.

Embodiment III

[0105] Embodiment III prepares polyimide active material III

[0106] Add tetraformic acid dianhydride powder and ethylenediamine solution into the N-dimethylformamide (DMF) solution at a molar ratio of 1:1, and keep magnetic stirring. The reaction vessel is a glass flask. The flask was protected with argon. The flask was transferred to a 50°C oil bath, and the temperature was gradually raised to 150°C. The reaction is maintained at this temperature for 4 to 18 hours. The resultant was collected, centrifuged, and the supernatant was removed. For the centrifuged sediment below, it was diluted and washed with N-dimethylformamide, and a second centrifugation was performed. Wash and centrifuge twice with ethanol. The final material was dried in a vacuum oven to obtain a dry powder, which was designated as polyimide active material III.

[0107] Infrared spectroscopy is used to test polyimide active materials Ⅰ~III. Typical test results are polyimide active materials I, from ...

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Abstract

The application discloses a water-based battery pole piece material, a water-based battery pole piece and its preparation method and application. The water-based battery pole piece material is a viscoelastic material with a solid content of 70-90%. The water-based battery pole piece material The raw materials include active materials with a mass percentage of 50% to 95%, and the active materials are polyimide materials. By making the water-based battery pole piece material into a viscoelastic material with a solid content of 70% to 90%, the extremely high The surface density of the sheet material and the uniformity of the quality of the pole piece improve the performance of the battery.

Description

technical field [0001] The application relates to a water-based battery pole piece material, a water-based battery pole piece and a preparation method and application thereof, belonging to the field of water-based batteries. Background technique [0002] So far, resource-based fossil fuels are still the main source of electricity supply for human beings. The carbon emission caused by its extensive use is the main cause of the current global greenhouse effect. As one of the important solutions, the development and utilization of renewable energy power generation represented by solar energy and wind energy has become a top priority. However, these natural energy sources including solar energy, wind energy, tidal energy, etc. are intermittent, and the amount of electric energy generated by them depends heavily on natural factors such as weather, season, time, and location. If these unstable electric energy is directly connected to the grid, it will seriously interfere with th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60H01M4/04H01M10/38
CPCH01M4/608H01M4/0435H01M10/38Y02P70/50
Inventor 闵刚李忆非任江涛王敏刚王晓东王耀国
Owner NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST