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High-safety ceramic diaphragm for lithium ion battery and preparation method

A lithium-ion battery, high-safety technology, applied in the direction of battery pack parts, circuits, electrical components, etc., can solve the problems of battery positive and negative pole contact short circuit, diaphragm damage, easily punctured diaphragm, etc., to improve thermal shrinkage performance , Enhanced puncture strength, not easily damaged

Inactive Publication Date: 2019-03-01
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

At present, the main problems of lithium-ion battery separators are: 1. During the use of the battery, due to the high heat release temperature, the separator will close the pores by itself, but as the temperature rises further, the heat shrinkage of the separator will cause the battery to be normal The negative poles contact short circuit and cause explosion; 2. During the repeated charge and discharge process, the sharp crystals produced on the surface of the electrode are easy to cause damage to the diaphragm and cause short circuit
In addition, considering the stretching and curling of the separator during the production process and the assembly of the battery, it is also easy to puncture the separator

Method used

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  • High-safety ceramic diaphragm for lithium ion battery and preparation method
  • High-safety ceramic diaphragm for lithium ion battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method for a high-safety ceramic diaphragm for lithium-ion batteries, comprising the following steps:

[0031] (1) Use solvent water to disperse the ammonium polyacrylate dispersant, then add alumina to disperse and stir for 60 minutes at a speed of 1500rpm, stir and disperse evenly before grinding, the weight ratio of dispersant to alumina is 0.0125:1.

[0032] (2) Add a carboxymethyl cellulose thickener to the solution obtained in step (1), and disperse for 30 minutes at a stirring rate of 30 rpm, and the weight-number ratio of the thickener to alumina is 0.4 :1.

[0033] (3) Add polyacrylate water-based adhesive to the mixed solution in step (2), and disperse for 30 minutes at a stirring rate of 30rpm, stir evenly, the weight parts of water-based adhesive and aluminum oxide The ratio is 0.2:1.

[0034] (4) Add a wetting agent and disperse for 30 minutes at a stirring rate of 30 rpm, stirring evenly. The weight-to-number ratio of the wetting agent to...

Embodiment 2

[0036] A preparation method for a high-safety ceramic diaphragm for lithium-ion batteries, comprising the following steps:

[0037] (1) Disperse the ammonium polyacrylate dispersant with solvent water, then add alumina to disperse and stir for 50 minutes at a speed of 1400rpm, stir and disperse evenly before grinding, the weight ratio of dispersant to alumina is 0.0125:1.

[0038] (2) Add carboxymethyl cellulose thickener to the solution obtained in step (1), and disperse for 40 minutes at a stirring rate of 20 rpm, and the weight-number ratio of thickener to alumina is 0.3 :1.

[0039] (3) Add polyacrylate water-based adhesive to the mixed solution in step (2), and disperse for 40 minutes at a stirring rate of 20rpm, stir evenly, the weight parts of water-based adhesive and aluminum oxide The ratio is 0.1:1.

[0040] (4) Add a wetting agent and disperse for 40 minutes at a stirring rate of 20 rpm, stirring evenly. The weight-to-number ratio of the wetting agent to the mix...

Embodiment 3

[0042] A preparation method for a high-safety ceramic diaphragm for lithium-ion batteries, comprising the following steps:

[0043] (1) Use solvent water to disperse the ammonium polyacrylate dispersant, then add alumina to disperse and stir for 70 minutes at a speed of 1600rpm, stir and disperse evenly before grinding, the weight ratio of dispersant to alumina is 0.0125:1.

[0044] (2) Add a carboxymethyl cellulose thickener to the solution obtained in step (1), and disperse for 20 minutes at a stirring rate of 40 rpm. The weight-number ratio of the thickener to aluminum oxide is 0.35 :1.

[0045] (3) Add polyacrylate water-based adhesive to the mixed solution in step (2), and disperse for 20 minutes at a stirring rate of 40rpm, stir evenly, the weight parts of water-based adhesive and aluminum oxide The ratio is 0.15:1.

[0046] (4) Add a wetting agent and disperse for 20 minutes at a stirring rate of 40rpm, stirring evenly. The weight-to-number ratio of the wetting agen...

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Abstract

The invention provides a high-safety ceramic diaphragm for a lithium ion battery. The high-safety ceramic diaphragm comprises a base membrane and ceramic slurry which is coated on the surface of the base membrane, wherein the ceramic slurry is prepared from the following components in parts by weight: 1 part of aluminum oxide, 0.0125 part of a dispersant, 0.3 to 0.4 part of a thickening agent, 0.1to 0.2 part of a waterborne adhesive and a wetting agent, wherein the mass part ratio of the wetting agent to a mixed solution containing the aluminum oxide, the dispersant, the thickening agent andthe waterborne adhesive is 0.001 to 1. The high-safety ceramic diaphragm has the advantages that the gram weight is enhanced, the thermal shrinkage performance of the diaphragm is improved, the puncture strength of the diaphragm is enhanced and the diaphragm is not easy to damage.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a high-safety ceramic diaphragm for lithium-ion batteries and a preparation method. Background technique [0002] Lithium-ion battery separators are mainly porous polyolefins. Currently, polyethylene or polypropylene is widely used, which plays an electronic insulating role in the positive and negative electrodes of the battery, and also provides channels for the free migration of ions in the electrolyte. At present, the main problems of lithium-ion battery separators are: 1. During the use of the battery, due to the high heat release temperature, the separator will close the pores by itself, but as the temperature rises further, the heat shrinkage of the separator will cause the battery to be normal 2. During the repeated charging and discharging process, the sharp crystals produced on the surface of the electrodes are likely to cause damage to the diaphragm and cause a short ci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14C09D1/00H01M50/403H01M50/434H01M50/451H01M50/457H01M50/489
CPCC09D1/00H01M50/431H01M50/403H01M50/449Y02E60/10
Inventor 汪星光杨盈利尹鑫飞
Owner SUZHOU GREEN POWER NEW ENERGY MATERIALS CO LTD
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