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Integrated pole piece and preparation method thereof, secondary battery and battery module

A pole piece, polyethylene oxide technology, applied in the direction of secondary batteries, battery electrodes, battery components, etc. Solve the problems of high crystallinity of olefin separator, achieve good liquid retention capacity, thinner thickness, and good thermal stability

Pending Publication Date: 2021-11-23
HUIZHOU LIWINON ELECTRONIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of polyolefin separator is that the film is thin and flexible, but the polyolefin separator has high crystallinity, low surface energy, low polarity, and poor affinity, wettability and liquid retention with the electrolyte. Poor contact with the surface of the positive and negative electrodes, which is likely to cause an increase in the internal resistance of the secondary battery
Although the coating of the ceramic layer improves its wettability and heat resistance to the electrolyte, when the temperature reaches above 130°C, the polyolefin separator may break holes, resulting in a short circuit between the positive and negative poles, causing the battery to spontaneously ignite ,There are security risks

Method used

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  • Integrated pole piece and preparation method thereof, secondary battery and battery module
  • Integrated pole piece and preparation method thereof, secondary battery and battery module
  • Integrated pole piece and preparation method thereof, secondary battery and battery module

Examples

Experimental program
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Effect test

preparation example Construction

[0053] 2. A method for preparing an integrated pole piece, comprising the following steps:

[0054] Step (A): adding polyethylene oxide and polyacrylic acid into a solvent, mixing and stirring to form a complex solution;

[0055] Step (B): mixing the complex solution and ceramic powder described in step (A) to obtain a coating slurry;

[0056] Step (C): Coating and drying the coating slurry in step (B) on at least one surface of the pole piece 1 to form a diaphragm slurry layer 2, the process is as follows figure 2 shown.

[0057] The preparation method of the integrated pole piece of the present invention has the advantages of simple preparation method, good controllability, easy operation and mass production. The prepared integrated pole piece such as Image 6 As shown, the surface is smooth without cracks, and the integrated pole piece has good flexibility. Figure 7 As shown, the surface is still smooth without cracks, which is suitable for roll core batteries and lam...

Embodiment 1

[0075] 1. A method for preparing an integrated pole piece, comprising the following steps:

[0076] Step (A): adding polyethylene oxide and polyacrylic acid into a solvent, mixing and stirring to form a complex solution;

[0077] Step (B): mixing the complex solution and wetting agent described in step (A), and then adding ceramic powder and binder and stirring and mixing to prepare a coating slurry;

[0078] Step (C): Coating and drying the coating slurry in step (B) on at least one surface of the pole piece 1 to form a diaphragm slurry layer 2, the process is as follows figure 2 As shown, the prepared integrated pole piece is as follows Image 6 with Figure 7 shown.

[0079] Wherein, the weight parts of polyethylene oxide and polyacrylic acid in the step (A) is 1:0.6.

[0080] Wherein, the molecular weight of the polyethylene oxide is 7 million.

[0081] Wherein, the parts by weight of the ceramic powder, the complex solution, the binder and the wetting agent are 84:1...

Embodiment 2

[0086] The difference from Example 1 is:

[0087] The parts by weight of polyethylene oxide and polyacrylic acid in the step (A) are 2:0.6.

[0088] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of secondary batteries, and particularly relates to an integrated pole piece and a preparation method thereof, a secondary battery and a battery module. The integrated pole piece comprises a pole piece; and a diaphragm slurry layer which is arranged on at least one side surface of the pole piece, wherein the diaphragm slurry layer comprises ceramic powder and a polyoxyethylene and polyacrylic acid complex. The integrated pole piece disclosed by the invention has good wettability and liquid retention property on electrolyte, has high-temperature heat resistance, avoids the risk of high-temperature hole breaking of the diaphragm, can also avoid short circuit caused by contact between the positive electrode and the negative electrode, and is good in safety.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an integrated pole piece and a preparation method thereof, a secondary battery and a battery module. Background technique [0002] Currently, the separators used commercially are ceramic-coated polyolefin separators. The advantage of polyolefin separator is that the film is thin and flexible, but the polyolefin separator has high crystallinity, low surface energy, low polarity, and poor affinity, wettability and liquid retention with the electrolyte. Poor contact with the surface of the positive and negative electrodes may easily cause an increase in the internal resistance of the secondary battery. Although the coating of the ceramic layer improves its wettability and heat resistance to the electrolyte, when the temperature reaches above 130°C, the polyolefin separator may break holes, resulting in a short circuit between the positive and negative poles, causing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/414H01M50/434H01M50/446H01M50/46H01M50/489H01M50/403H01M4/131H01M4/133H01M4/134H01M4/136H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M10/0525
CPCH01M50/446H01M50/414H01M50/434H01M50/46H01M50/489H01M50/403H01M4/131H01M4/133H01M4/134H01M4/136H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M10/0525Y02E60/10
Inventor 符宽赖旭伦孙先维陈杰杨山
Owner HUIZHOU LIWINON ELECTRONIC TECH CO LTD
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