Porous hyperbranched polyester graphite oxide membrane, and preparation method and application thereof

A technology of hyperbranched polyester and hyperbranched polyether, which is applied in the field of porous membrane materials, can solve the problems of melting, thermal shrinkage and melting of battery separators, and achieve high affinity, solve thermal shrinkage and melting, and superior heat resistance Effect

Active Publication Date: 2016-09-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects and deficiencies in the prior art of battery separators thermally shrinking and melting at high temperatures, and to provide a porous hyperbranched po

Method used

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  • Porous hyperbranched polyester graphite oxide membrane, and preparation method and application thereof
  • Porous hyperbranched polyester graphite oxide membrane, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Preparation:

[0042] S1. Dissolve 1.17g of metal potassium in methanol to form a 30wt% potassium methoxide solution, weigh 1.34g of trimethylolpropane and the above 30wt% potassium methoxide solution, reflux and condense under nitrogen and heat to 90°C , and then 46.62g of glycidol was slowly added dropwise to the above-mentioned solution by titration to react for 12h, the solution after the reaction was dissolved in 40mL of methanol, and 2wt% hydrochloric acid solution was added dropwise to the above-mentioned solution. properties, and then the solution was purified by co-precipitation in 250 mL of acetone to obtain light yellow transparent hyperbranched polyether polyol.

[0043] S2. Take 10 mL of styrene monomer that has been treated with basic alumina and add it to a three-necked flask filled with 100 mL of water and 0.01 g of sodium dodecylbenzenesulfonate, blow nitrogen gas, and pre-emulsify at 55 ° C for 30 min, then Weigh 0.1 g of potassium persulfate, diss...

Embodiment 2

[0051] Different from Example 1, the reaction time is 24h; the amount of sodium dodecylbenzenesulfonate in the emulsion polymerization reaction in the S2 is 0.02g, and the average particle diameter obtained is a polystyrene emulsion of 310nm; after determination, the above-mentioned preparation The porous hyperbranched polyester graphite oxide film has a thickness of 113 μm and a liquid absorption rate of 134%.

Embodiment 3

[0053] Different from Example 1, the reaction time is 24h; the amount of sodium dodecylbenzenesulfonate in the emulsion polymerization reaction in the S2 is 0.03g, and the polystyrene emulsion with an average particle diameter of 240nm is obtained; after determination, the above-mentioned preparation The porous hyperbranched polyester graphite oxide film has a thickness of 106 μm and a liquid absorption rate of 128%.

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Abstract

This invention discloses a porous hyperbranched polyester graphite oxide membrane, and a preparation method and an application thereof. The preparation method of the porous hyperbranched polyester graphite oxide membrane comprises the steps of utilizing polystyrene latex as a template and grafting hyperbranched polyether polyol on graphite oxide through an esterification reaction. The polystyrene latex is prepared by the polymerization reaction of styrene, potassium persulfate and sodium dodecyl benzene sulfonate; the hyperbranched polyether polyol is prepared by reacting potassium methoxide solution, trimethylolpropane and glycidol; the graphite oxide is prepared by reacting natural graphite, potassium permanganate, concentrated sulfuric acid and concentrated phosphoric acid. The prepared porous hyperbranched polyester graphite oxide membrane has excellent heat-resistance property, heat stability, mechanical strength and high lyophilic performance, and has a wide application prospect in the lithium-ion battery separator.

Description

technical field [0001] The invention belongs to the technical field of porous membrane materials, and more specifically relates to a porous hyperbranched polyester graphite oxide membrane and its preparation method and application. Background technique [0002] Due to the advantages of high energy density, low self-discharge, no memory effect and stable discharge voltage platform, lithium-ion batteries have gradually replaced traditional lead-acid batteries and nickel-cadmium batteries and become the main choice of power batteries. The diaphragm is a key component of the lithium-ion battery, known as the "third pole of the lithium-ion battery". The role of conduction is an important determinant of battery capacity, cycle capability and safety performance. During the high-power discharge process of the power battery, as the local temperature of the battery reaches 100°C, the solid electrolyte interface film of the negative electrode will decompose and release heat, resulting...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/446H01M50/489H01M50/491
CPCH01M10/0525H01M50/40H01M50/409H01M50/446H01M50/403Y02E60/10
Inventor 廖海洋张海燕洪浩群秦改
Owner GUANGDONG UNIV OF TECH
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