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Electrode plate and secondary battery thereof

A technology of electrode pole piece and pole piece, which is applied in the field of new energy technology and materials, can solve the problems of poor wrapping ability of the pole piece edge, weak interaction force of foil materials, and increase of potential safety hazards of battery cells, so as to eliminate burrs or short circuits , Good resistance to electrolyte, strong adhesion effect

Pending Publication Date: 2022-06-03
SHENZHEN YANYI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent can reduce the burrs formed on the cutting edge to a certain extent, thereby reducing the risk of burrs piercing the diaphragm. However, this patent uses materials such as polyvinylidene fluoride as an insulating layer binder, which interacts with the foil The force is weak, and the ability to wrap the edge of the pole piece is poor, and the safety problems such as dust debris, toxic gas, and edge metal beads during the cutting process of the pole piece cannot be solved.
In addition, if materials such as polyvinylidene fluoride are used as the adhesive of the insulating layer, there is a risk of the insulating layer falling off due to swelling in the electrolyte or insufficient adhesion, which increases the safety hazard of the battery cell.

Method used

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  • Electrode plate and secondary battery thereof
  • Electrode plate and secondary battery thereof
  • Electrode plate and secondary battery thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0095]

[0096] Mix 95 parts of positive active material NCM811, 2 parts of conductive auxiliary material conductive carbon black Super-P, and 3 parts of binder polyvinylidene fluoride (PVDF), add N-methylpyrrolidone (NMP) as a solvent, solid content 70%, stir and disperse uniformly in a vacuum stirring tank to obtain a uniform and stable positive electrode active material slurry.

[0097] Mix 20 parts of organic polymer polyamideimide PAI and 80 parts of inorganic insulating filler modified alumina, then add 203 parts of NMP as a solvent, the solid content is 33%, stir and disperse in a vacuum stirring tank, and obtain Uniform and stable insulating layer paste.

[0098] Using an extrusion coater, with a coating width of 188 mm and a linear speed of 20 m / min, the positive electrode active material slurry was uniformly coated on the front and back surfaces of the current collector main region of the aluminum foil as the current collector to form a positive electrode Active s...

preparation example 2～12

[0103]

[0104] The preparation method is basically the same as that of the positive electrode preparation example 1, and the main difference lies in the types of materials such as organic polymers and inorganic insulating fillers, their glass transition temperatures, the thickness and width of the prepared layers, etc. For details, see Table 1, and obtain The positive pole pieces 2 to 12 are installed. Among them, the insulating layer in the positive electrode preparation example 6 did not use an inorganic insulating filler.

preparation example 13

[0106]

[0107] Except that the insulating layer slurry was not prepared and the insulating layer slurry was not extrusion-coated, the preparation method was basically the same as that of the positive electrode preparation example 1. See Table 1 for related parameters such as substance type, glass transition temperature, thickness and width.

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Abstract

The invention discloses an electrode plate and a secondary battery. The pole piece is provided with the insulating layer, the insulating layer comprises the organic polymer which contains the imide structure and does not contain fluorine, and the insulating layer is good in flexibility, good in electrolyte resistance and high in cohesiveness with the current collector; the safety problem that dust chippings, edge burrs, edge metal molten beads or poisonous gas are generated in the pole piece cutting machining process can be effectively solved. And meanwhile, the potential safety hazard that the insulating layer falls off due to swelling or insufficient binding power in electrolyte is solved. The secondary battery using the electrode plate has low self-discharge ratio and good safety performance.

Description

technical field [0001] The invention relates to the field of new energy technologies and materials, in particular to an electrode pole piece and a secondary battery thereof. Background technique [0002] With the development and progress of human society, energy consumption has exploded, and the problem of depletion of non-renewable resources has gradually emerged, and people's demand for renewable energy has become increasingly urgent. As a recyclable clean energy, secondary batteries are widely used in various electronic devices and electric vehicles. [0003] As a high-density energy storage device, the safety performance of secondary batteries is particularly important. The secondary battery includes components such as a casing, electrode terminals, electrode sheets, and separators, wherein the electrode sheets are provided with tabs (ie, blank areas reserved at the edge of the current collector when the electrode sheets are coated), which are led out to the electrode t...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M10/0525H01M10/054
CPCH01M4/13H01M10/0525H01M10/054H01M2004/021Y02P70/50
Inventor 岳敏周竹欣钱超
Owner SHENZHEN YANYI NEW MATERIALS CO LTD