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Functional modified diaphragm as well as preparation method and application thereof

A functional and diaphragm technology, applied in electrochemical generators, electrical components, circuits, etc., can solve problems such as poor rate and cycle performance, poor electrolyte retention capacity, and polyolefin diaphragms that cannot absorb electrolyte well. Achieve the effects of strong liquid absorption and liquid retention, low price, and good industrial application prospects

Active Publication Date: 2017-06-06
厦门益舟新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the functionalized modified diaphragm prepared by the present invention has the advantages of high ion conductivity, superior rate performance, high safety, etc., and can well solve the problem that the polyolefin diaphragm in the prior art cannot absorb the electrolyte well and maintain the electrolyte. The technical problems of poor capacity, poor rate and cycle performance; and the product of the present invention is relatively cheap compared to polydopamine modified diaphragms, and is easy to popularize and apply

Method used

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  • Functional modified diaphragm as well as preparation method and application thereof
  • Functional modified diaphragm as well as preparation method and application thereof
  • Functional modified diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1: Preparation of a functionalized modified diaphragm and its application in lithium-ion batteries

[0063] Preparation of functionalized modified separator:

[0064] Prepare a pH buffer solution: use water / ethanol with a volume ratio of 1:1 as a solvent to prepare a 10 mmol / L tris / hydrochloric acid pH buffer solution with a pH of 8.5.

[0065] Preparation of mixed monomer polymerization precursor solution: dissolving catechol in the prepared pH buffer solution to prepare a 20 mmol / L solution. The molar ratio is: catechol / tetraethylenepentamine=4 / 1, and a certain amount of tetraethylenepentamine is added. Thoroughly stir, dissolve and mix to prepare a mixed monomer polymerization precursor.

[0066] Preparation of functionalized modified diaphragm: 100cm 2 Immerse in 50mL mixed monomer polymerization precursor solution, and soak and react at room temperature for 24h under the condition of oxygen flow. Afterwards, the diaphragm was pulled out, washed repeated...

Embodiment 2

[0074] Example 2: Preparation of a functionalized modified diaphragm and its application in lithium-ion batteries

[0075] Preparation of functionalized modified separator:

[0076] Prepare a pH buffer solution: use water / methanol with a volume ratio of 1:1 as a solvent to prepare a 10 mmol / L tris / hydrochloric acid pH buffer solution with a pH of 10.

[0077] Preparation of mixed monomer polymerization precursor: 3-methylcatechol was dissolved in the prepared pH buffer solution to prepare a 400 mmol / L solution. The molar ratio is: 3-methylcatechol / polyethyleneimine (molecular weight: 600)=10 / 1, and quantitative polyethyleneimine (molecular weight: 600) is added. Thoroughly stir, dissolve and mix to prepare a mixed monomer polymerization precursor.

[0078] Preparation of functionalized modified diaphragm: the polypropylene (PP) diaphragm sample (that is, the organic diaphragm substrate to be modified) was 2 Immerse in 50mL mixed monomer polymerization precursor solution, an...

Embodiment 3

[0083] Example 3: Preparation of a functionalized modified diaphragm and its application in lithium-ion batteries

[0084] Preparation of functionalized modified separator:

[0085] Prepare a pH buffer solution: use water / dimethylacetamide with a volume ratio of 1:1 as a solvent to prepare a 10 mmol / L tris / hydrochloric acid pH buffer solution with a pH of 12.

[0086] Prepare mixed monomer polymerization precursor solution: dissolve tannic acid in the prepared pH buffer solution to make a 2 mmol / L solution. The molar ratio is: tannic acid / p-methylphenethylamine=1 / 5, and a quantitative amount of p-methylphenethylamine is added. Thoroughly stir, dissolve and mix to prepare a mixed monomer polymerization precursor.

[0087] Preparation of functionalized modified diaphragm: Scrape-coat 500mL of mixed monomer polymerization precursor solution on 1m 2 The surface of the polyvinyl chloride diaphragm sample (that is, the organic diaphragm substrate to be modified) is placed in an o...

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Abstract

The invention relates to a functional modified diaphragm which comprises an organic diaphragm base material, wherein composite monomer copolymerization polymer layers are arranged on the surface and internal pores of the organic diaphragm base material; each composite monomer copolymerization polymer layer is formed by a monomer A with polyphenol functional groups and a monomer B with amino functional groups in a copolymerization manner. The invention further relates to a preparation method of the functional modified diaphragm, and the application of the functional modified diaphragm in a secondary battery. As the diaphragm is modified in a mode that the composite monomer copolymerization polymer layers are formed on the surface and internal pores of the organic diaphragm base material in situ, the functional modified diaphragm is excellent in comprehensive property, strong in liquid absorption and retention property, high in ionic conductivity, excellent in rate capability and high in security when being compared with a polyolefin diaphragm. The functional modified diaphragm is simple to operate, low in environment requirement and small in pollution, and has good industrial application prospect since substances used in the production process are low in price and green and environmental-friendly.

Description

technical field [0001] The invention belongs to the technical field of new energy, is applied to products such as batteries and capacitors, and specifically relates to a functionalized modified diaphragm and a preparation method thereof. More specifically, the method for functionally modified lithium-ion battery diaphragms of the present invention relates to organic diaphragms The substrate, and the composite monomer copolymerized polymer layer formed in situ on the surface and internal pores of the organic membrane substrate. The invention also relates to an application of the functionalized modification method in chemical power systems such as lithium ion batteries, and a battery containing the functionalized modified diaphragm. Background technique [0002] Lithium-ion battery is a kind of secondary battery, which is composed of positive electrode, negative electrode, separator and electrolyte. . During the charging and discharging process, Li + Intercalation and deint...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525C08J9/42H01M50/403H01M50/411
CPCH01M10/0525C08J9/42C08J2323/12C08J2323/06C08J2333/20C08J2327/06H01M50/403H01M50/411Y02E60/10
Inventor 肖冰
Owner 厦门益舟新能源科技有限公司
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