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
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[0062] Example 1: Preparation of a functionalized modified separator and its application in lithium-ion batteries
[0063] Preparation of functionalized modified diaphragm:
[0064] Preparation of pH buffer solution: use water / ethanol with a volume ratio of 1:1 as a solvent, and configure a pH buffer solution of 10 mmol / L tris(hydroxymethylaminomethane) / hydrochloric acid with a pH of 8.5.
[0065] Prepare mixed monomer polymerization precursor solution: dissolve catechol in the prepared pH buffer solution to prepare a solution of 20 mmol / L. According to the molar ratio: catechol / tetraethylenepentamine=4 / 1, add quantitative tetraethylenepentamine. Fully stirring, dissolving and mixing to prepare a mixed monomer polymerization precursor solution.
[0066] Preparation of functionalized modified diaphragm: 100 cm of 16 μm polyethylene (PE) diaphragm sample (porosity = 41%, namely the organic diaphragm substrate to be modified) 2 Immerse in 50 mL of mixed monomer polymerization ...
Example Embodiment
[0074] Example 2: Preparation of a functionalized modified separator and its application in lithium-ion batteries
[0075] Preparation of functionalized modified diaphragm:
[0076] Prepare pH buffer solution: use water / methanol with a volume ratio of 1:1 as solvent, and configure a pH buffer solution of 10 mmol / L tris(hydroxymethylaminomethane) / hydrochloric acid with pH 10.
[0077] Prepare mixed monomer polymerization precursor solution: dissolve 3-methylcatechol in the prepared pH buffer solution to prepare a solution of 400 mmol / L. According to the molar ratio: 3-methylcatechol / polyethyleneimine (molecular weight 600)=10 / 1, quantitative polyethyleneimine (molecular weight 600) was added. Fully stirring, dissolving and mixing to prepare a mixed monomer polymerization precursor solution.
[0078] Preparation of functionalized modified diaphragm: 100 cm of polypropylene (PP) diaphragm sample (ie, the organic diaphragm substrate to be modified) 2 Immerse in 50 mL of mixed m...
Example Embodiment
[0083] Example 3: Preparation of a functionalized modified separator and its application in lithium ion batteries
[0084] Preparation of functionalized modified diaphragm:
[0085] Preparation of pH buffer solution: use water / dimethylacetamide with a volume ratio of 1:1 as a solvent, and configure a pH buffer solution of 10 mmol / L tris(hydroxymethylaminomethane) / hydrochloric acid with a pH of 12.
[0086] Prepare mixed monomer polymerization precursor solution: dissolve tannin in the prepared pH buffer solution to prepare a solution of 2 mmol / L. The molar ratio is: tannin / p-methylphenethylamine=1 / 5, and quantitative p-methylphenethylamine is added. Fully stirring, dissolving and mixing to prepare a mixed monomer polymerization precursor solution.
[0087] Preparation of functionalized modified diaphragm: use an automatic coater to scrape 500 mL of mixed monomer polymerization precursor solution on 1 m 2 The surface of the polyvinyl chloride membrane sample (ie, the organic...
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