Battery electrode, preparation method thereof and battery

A battery electrode and electrode active material technology, which is applied to battery electrodes, electrode carriers/collectors, lithium batteries, etc., can solve the problems of unsatisfactory high-power output and large-capacity supply of batteries, and achieve electrode capacity and cycle performance. Effects of improving large current discharge characteristics and improving rapid discharge performance

Active Publication Date: 2011-05-11
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the unsatisfactory problems of high power output and large capacity supply of batteries in the prior art, the present invention

Method used

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  • Battery electrode, preparation method thereof and battery
  • Battery electrode, preparation method thereof and battery
  • Battery electrode, preparation method thereof and battery

Examples

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preparation example Construction

[0025] The present invention also provides a preparation method for preparing the above-mentioned battery electrode, the steps include

[0026] a, coating the slurry containing electrode active material, electrode binder and solvent on the current collector, drying, and coating the active material layer on the current collector;

[0027] b, attaching micronanoscale dry powder particles containing dry powder particles of micronanoscale electrode active materials to the surface of the active material layer to prepare a battery electrode. The method of the invention is simple and easy to realize, overcomes the problem of compatibility between layers, and reduces the influence on the active material layer.

[0028] Among them, the preparation of the slurry containing the electrode active material, electrode binder and solvent adopts various techniques known to those skilled in the art. The active material of the positive electrode can be common active material in this field, such...

Embodiment 1

[0038] (1) Production of positive electrode:

[0039] 940 grams of positive electrode active material LiCoO2 (94%), 30 grams of binder PVDF (3%), 30 grams of conductive agent acetylene black (3%) are added in 600 grams of solvent NMP (nitrogen methyl pyrrolidone), and then Stir in a mixer to form a stable and uniform cathode slurry. The slurry was evenly and intermittently coated on both sides of an aluminum foil (aluminum foil size: width 160 mm, thickness 16 microns), and then dried at 120° C. to prepare a battery positive electrode with a 0.120-0.130 mm thick active material layer.

[0040] 50 grams (5%) of acetylene black with an average particle size of 0.08 μm and 950 grams (95%) of LiCoO with an average particle size of 5 μm were stirred to form a uniform powder mixture, and the powder mixture was put into the powder spraying system In the powder supply device, adjust the voltage of the electrostatic generator to 55,000 volts, spray the above-mentioned dried electrodes...

Embodiment 2

[0047] The same method as in Example 1 was used to prepare the positive electrode, negative electrode and battery, except that the thickness of the active material layer was increased by 10 μm. During the preparation of the positive electrode and negative electrode of the battery, the voltage of the electrostatic generator was adjusted to 55,000 volts. Spraying treatment, control flow rate pressure 0.15MPa, spraying distance 200mm, powder output 80g / min, atomization pressure 0.3MPa and spraying speed 4.0m / min, spray a layer of micro-nano particles with a thickness of 5μm on the above electrode, obtained from the SEM image The average distance between the micron-sized particles of the positive electrode is about 8 microns, and the average distance between the micron-sized particles of the negative electrode is about 6 microns.

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Abstract

The invention provides a battery electrode, a preparation method thereof, and a battery. The battery electrode comprises a current collector and an active substance layer coated on the current collector; a micro-nano particle layer is adhered to the surface of the active substance layer; the active substance layer comprises electrode active substance and electrode binder; the micro-nano particle layer comprises micro-nano dry powder particles; and the micro-nano dry powder particles comprise dry powder particles of the micro-nano electrode active substance. Interface impedance between the electrode and electrolyte is reduced and rate discharge performance of the battery is improved; a micro-nano active material reduces serious volume effect of the material; and specifically, the micro-nano particle layer may not comprise the binder preferably, so that the large-current discharge characteristic of the battery is improved further. The method is simple and is easy to implement; and the combinability between the micro-nano particle layer and the active substance layer is high, and the surface of the active substance layer is not polluted by the substances of an upper layer.

Description

technical field [0001] The invention relates to a battery electrode, a preparation method thereof and a battery. Background technique [0002] Lithium batteries have been widely used as high specific energy chemical power sources in mobile communications, notebook computers, Video cameras, cameras, portable instruments and other fields are also the preferred supporting power sources for electric vehicles and space power sources that have been vigorously researched by various countries. [0003] In particular, a large number of existing large-scale products generally have high-power output and large-capacity supply, such as electric vehicles. The hotspots and difficulties in the research of battery performance in the existing technology are relatively mature and can be easily applied to the improvement of actual production, generally focusing on the improvement of the structure of the electrode, for example, by changing the surface structure of the electrode, using a low com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/64H01M4/62H01M4/139H01M10/052
CPCY02E60/10
Inventor 马永军吴声本
Owner SHANGHAI BYD
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