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Lithium ion battery diaphragm, lithium ion battery and preparation method of lithium ion battery diaphragm

A lithium-ion battery and diaphragm technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of increased internal impedance of the battery, contact short circuit between the positive and negative poles of the battery, and puncture of the diaphragm to improve thermal shrinkage performance , heat shrinkage reduction, and the effect of improving puncture strength

Pending Publication Date: 2021-11-02
SUZHOU GREEN POWER NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main problems of the ceramic diaphragm are: 1. During the use of the battery, due to the high heat release temperature, the diaphragm will close the pores by itself, but as the temperature rises further, the thermal shrinkage of the diaphragm will cause the positive and negative poles of the battery to 2. During the repeated charging and discharging process, the dendrites generated on the surface of the electrode will cause the diaphragm to be damaged and cause a short circuit; at the same time, due to the uneven surface of the electrode and the technological level in the assembly process, the diaphragm will be stabbed 3. During the battery manufacturing process, the peeling strength between the coating and the base film is too small, which will firstly cause the powder to fall from the separator during the winding process of the battery; At the end of the battery cycle, the internal impedance of the battery will increase and the cycle performance of the battery will be reduced.

Method used

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  • Lithium ion battery diaphragm, lithium ion battery and preparation method of lithium ion battery diaphragm
  • Lithium ion battery diaphragm, lithium ion battery and preparation method of lithium ion battery diaphragm
  • Lithium ion battery diaphragm, lithium ion battery and preparation method of lithium ion battery diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A high-safety diaphragm for lithium-ion batteries, which is prepared through the following steps:

[0052] (1) Disperse ammonium polyacrylate with water, then add alumina to disperse and stir for 70 minutes at a speed of 1500rpm, stir and disperse evenly before grinding, the ratio of dispersant to alumina by weight is 0.005:1.

[0053] (2), add solution-type polyacrylate to the mixed solution obtained in step (1), and disperse for 30 minutes with a stirring rate of 30rpm, grind after stirring evenly, the weight and number ratio of solution-type polyacrylate and aluminum oxide is 0.01:1.

[0054] (3) Add sodium carboxymethyl cellulose to the mixed liquid obtained in step (2), and disperse for 30 minutes at a stirring speed of 30 rpm, and the ratio by weight of thickener to aluminum oxide is 0.015:1.

[0055] (4) Add emulsion-type polyacrylate to the mixed solution obtained in step (3), and disperse for 30 minutes at a stirring rate of 30 rpm, stir evenly, and the weight-n...

Embodiment 2

[0059] A high-safety diaphragm for lithium-ion batteries, which is prepared through the following steps:

[0060] (1) Disperse ammonium polyacrylate with water, then add alumina to disperse and stir for 70 minutes at a speed of 1400rpm, stir and disperse evenly before grinding, the weight-number ratio of dispersant to alumina is 0.005:1.

[0061] (2), add solution type polyacrylate in the mixed solution that step (1) obtains, and disperse 40 minutes with the stirring rate of 20rpm, grind after stirring evenly, the weight and number ratio of solution type polyacrylate and aluminum oxide is 0.008:1.

[0062] (3) Add sodium carboxymethyl cellulose to the mixed liquid obtained in step (2), and disperse for 40 minutes at a stirring rate of 20 rpm, and the ratio by weight of thickener to aluminum oxide is 0.01:1.

[0063] (4) Add emulsion-type polyacrylate to the mixed solution obtained in step (3), and disperse for 20 minutes at a stirring rate of 40 rpm, stir evenly, and the weig...

Embodiment 3

[0067] A high-safety diaphragm for lithium-ion batteries, which is prepared through the following steps:

[0068] (1) Disperse ammonium polyacrylate with water, then add alumina to disperse and stir for 50 minutes at a speed of 1600rpm, stir and disperse evenly before grinding, the weight-number ratio of dispersant to alumina is 0.005:1.

[0069] (2), add solution type polyacrylate in the mixed solution that step (1) obtains, and disperse 40 minutes with the stirring rate of 20rpm, grind after stirring evenly, the weight and number ratio of solution type polyacrylate and aluminum oxide is 0.012:1.

[0070] (3) Add sodium carboxymethyl cellulose to the mixed liquid obtained in step (2), and disperse for 20 minutes at a stirring speed of 40 rpm, and the weight-number ratio of the thickener and aluminum oxide is 0.02:1.

[0071] (4) Add emulsion-type polyacrylate to the mixed solution obtained in step (3), and disperse for 20 minutes at a stirring rate of 40 rpm, stir evenly, an...

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Abstract

The invention provides a lithium ion battery diaphragm, a lithium ion battery and a preparation method of the lithium ion battery diaphragm. The lithium ion battery diaphragm comprises a base membrane and a ceramic coating covering the surface of the base membrane, and the ceramic coating comprises the following raw materials in parts by weight: 1 part of aluminum oxide; 0.01 to 0.02 part of a thickening agent; 0.008 to 0.012 part of a solution type water-based adhesive; 0.03 to 0.05 part of an emulsion type water-based adhesive; 0.001 to 0.01 part of a dispersing agent; and 0.0001 to 0.0005 part of a wetting agent. The lithium ion battery diaphragm disclosed by the invention has relatively good thermal shrinkage performance and puncture strength, and the safety of the battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium battery separators, and relates to a lithium ion battery separator, a lithium ion battery and a preparation method of the lithium ion battery separator, in particular to a safer lithium ion battery separator and a preparation method thereof. Background technique [0002] Lithium-ion battery separators are mainly porous polyolefins. At present, polyethylene or polypropylene is widely used, which can maintain thermal stability (-20°C to 60°C) during battery use. At the same time, the separator plays a role in the positive and negative electrodes of the battery. Electronic insulation also provides channels for the free migration of ions in the electrolyte. [0003] With the advancement of science and technology, people have higher and higher requirements for high-power and portable electronic equipment, especially for high-current, high-rate discharge, high heat resistance, and good ability to absorb and maint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/451H01M50/446H01M50/434H01M50/403H01M50/489H01M10/0525
CPCH01M50/451H01M50/446H01M50/434H01M50/403H01M50/489H01M10/0525Y02E60/10
Inventor 赵晓晁党安汪星光
Owner SUZHOU GREEN POWER NEW ENERGY MATERIALS CO LTD
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