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Electrode preparation method and battery

An electrode and electrode film technology, applied in the field of electrode preparation method and battery, can solve the problems of large amount of solvent and long process time, etc.

Active Publication Date: 2019-06-04
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing battery electrode manufacturing process uses a large amount of solvent, which consumes energy to dry and remove the solvent, and the process takes a long time to save energy.

Method used

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  • Electrode preparation method and battery
  • Electrode preparation method and battery
  • Electrode preparation method and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, the positive electrode active materials nickel-cobalt-manganese-lithium, polyperfluoroethylene-propylene, and carbon nanotubes were placed in a twin-screw kneader and dispersed for 30 minutes at -30°C to obtain a flocculent mixture, which was added to the single-screw The extruder passes through four temperature control zones with temperatures of 60°C, 80°C, 90°C and 100°C, extrudes soft lumps from the die, and the soft lumps are molded at 100°C to obtain a sheet film, and the sheet film is passed through Roll pressing at 110°C to make a continuous film, the continuous film is adhered to aluminum foil through conductive adhesive, and roll pressing at 120°C to make a positive electrode. There is no N-methylpyrrolidone in the manufacturing process, and the consumption of N-methylpyrrolidone is reduced by 100% compared with the existing battery cathode preparation method. Such as figure 1 shown.

[0032] In this example, the negative electrode active mat...

Embodiment 2

[0036] In this example, the positive electrode active material lithium cobaltate, vinylidene fluoride trifluoroethylene copolymer and graphene were placed in an internal mixer and dispersed at 13°C for 1 hour to obtain a flocculent mixture. Disperse for 2 hours to obtain soft lumps. The soft lumps were molded at 105°C to obtain a sheet-like film. The sheet-like film was rolled at 105°C to form a continuous film. The continuous film was adhered to aluminum foil with conductive adhesive and rolled at 110°C to form a positive electrode. There is no N-methylpyrrolidone in the manufacturing process, and the consumption of N-methylpyrrolidone is reduced by 100% compared with the existing battery cathode preparation method. Such as figure 2 shown.

[0037]In this example, the negative electrode active material pre-lithiated graphite and carbon nanofibers were placed in a twin-screw kneader, dispersed for 30 minutes at a temperature of 25°C, added with 30% carboxymethyl cellulose so...

Embodiment 3

[0039] In this example, the positive electrode active materials lithium iron phosphate, ethylene-tetrafluoroethylene copolymer, and graphite were placed in a classifier, and airflow was impacted and dispersed for 30 minutes at 25°C to obtain a flocculent mixture, which was placed in banburying Machine, disperse at 40°C for 2 hours to obtain soft lumps, roll the soft lumps at 110°C to obtain a sheet film, roll the sheet film at 150°C to form a continuous film, and the continuous film is adhered to the aluminum foil through conductive adhesive. Roll pressing at 280°C to form a positive electrode. There is no N-methylpyrrolidone in the manufacturing process, and the consumption of N-methylpyrrolidone is reduced by 100% compared with the existing battery cathode preparation method.

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Abstract

The invention discloses an electrode preparation method and a battery. The battery anode is prepared by pasting an electrode film prepared from an active substrate, a conductive agent and a binder toa current collector, the surface density of a pole piece is improved, the electrode capacity and the pole piece stability are improved, and the internal resistance is reduced. In the preparation process of the electrode film, lamellar crystals of the binder are stretched to paste the active substance and conductive agent, influence of expansion and contraction of the active substance caused by ionembedding and separating is reduced. The battery cathode is prepared by coating a slurry prepared from a pre-lithium active substance, a binder and a conductive agent on the current collector, the active substrate and conductive agent of the cathode are wetted rapidly, dispersed ultra-finely and homogeneous in a binder solution, the amount of the solvent for slurry dispersion is reduced, energy consumption for drying is reduced, the electrode process is shortened, and the load capacity of the cathode active substance is improved. The anode and cathode of the battery can be designed in an integrated way, and energy storage of the battery is improved. The electrode preparation method is simple, production and manufacture are realized by means of existing equipment, and the method is easy topopularize.

Description

technical field [0001] The invention belongs to the technical field of energy, and specifically relates to an electrode preparation method and a battery. Background technique [0002] The electrode is the core component of the power battery to store energy, and it is also the component that accounts for the largest cost of the battery. The electrode mainly includes an active material, a conductive agent, a binder and a current collector. The existing battery electrode preparation method is to uniformly disperse the active material, a conductive agent and a binder in a solvent, and then coat it on the current collector. The fabricated pole piece and the separator are wound or stacked together to make a core, put into the shell, inject liquid, and form to obtain a battery. The existing battery electrode manufacturing process uses a large amount of solvent, which consumes energy to dry and remove the solvent, and the process takes a long time. Contents of the invention [0...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/1391H01M4/1395H01M4/1397H01M4/04H01M10/0525
CPCY02E60/10
Inventor 荣常如陈书礼韩金磊
Owner CHINA FIRST AUTOMOBILE
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