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Method for modifying polymer diaphragm by using polymethyl methacrylate

A polymethyl methacrylate, polymer film technology, applied in electrical components, circuits, battery pack parts and other directions, can solve the problem of the electrolyte matching of the coating film, affecting the safety performance of the battery system and the discharge capacity of the battery Difficult to play and other problems, to achieve the effect of improving cycle performance, easy operation, and improved matching

Active Publication Date: 2018-11-30
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the coating layer will increase the internal resistance of the battery, making it difficult to exert the discharge capacity of the battery
Powder falling will affect the safety performance of the battery system
There are still problems with the compatibility of the coating film with the positive electrode, negative electrode, and electrolyte

Method used

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  • Method for modifying polymer diaphragm by using polymethyl methacrylate
  • Method for modifying polymer diaphragm by using polymethyl methacrylate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the reaction kettle, mix acetone and dimethylformamide in a volume ratio of 4:1 to obtain a mixed solution. Condensed aluminum phosphate with a particle size of 20nm and 1.25% of the weight of the mixed solution was added, and ultrasonically oscillated for 15 minutes to obtain a uniformly mixed suspension. Add polymethyl methacrylate with 1.25% by weight of the mixed solution and an average molecular weight of 800,000 to the suspension, and ultrasonically shake for 25 minutes. Stir at 50°C for 9 h to make the solution in the reaction kettle turn into a viscous liquid. After laying the polypropylene single-layer film (thickness 20μm), place it under glow discharge conditions, and treat one surface of the single-layer film for 60 seconds, and coat the viscous liquid on the discharge-treated polypropylene single-layer film. The surface is coated with a thickness of 12 µm and dried in a vacuum at 60°C and a pressure of 0.01 atm to prepare a coating film modified by polym...

Embodiment 2

[0028] In the reaction kettle, acetone and dimethylformamide were mixed in a volume ratio of 0.1:1 to obtain a mixed solution. Add 0.5% by weight of the mixed solution weight and aluminum metaphosphate with a particle size of 1 nm, and ultrasonically shake for 1 min to obtain a uniformly mixed suspension. Add 0.5% by weight of the mixed solution weight and polymethyl methacrylate with an average molecular weight of 600,000 to the suspension, and vibrate ultrasonically for 10 minutes. Stir at 40°C for 8 h to make the solution in the reactor turn into a viscous liquid. After laying the polyethylene monolayer film flat, place it under corona discharge conditions to discharge an outer surface of the monolayer film for 10 minutes, and coat the viscous liquid on an outer surface of the treated polyethylene monolayer film. Vacuum drying was performed at 50°C and 0.071 atm pressure to prepare a coating film modified by polymethyl methacrylate.

Embodiment 3

[0030] In the reaction kettle, acetone and dimethylformamide were mixed in a volume ratio of 12:1 to prepare a mixed solution. 2.5% by weight of the mixed solution weight and aluminum dihydrogen phosphate with a particle size of 1 μm are added, and ultrasonically shaken for 30 minutes to obtain a uniformly mixed suspension. Add 2.5% by weight of the mixed solution weight and an average molecular weight of 1.6 million polymethyl methacrylate to the suspension, and vibrate ultrasonically for 50 minutes. Stir at 80°C for 12 h to turn the solution in the reaction kettle into a viscous liquid. After laying the PP / PE / PP multilayer film flat, place it under radio frequency low-temperature plasma conditions, and treat the two surfaces of the multilayer film separately for 1 second, and coat the viscous liquid on the discharge-treated multilayer film. The two outer surfaces were vacuum dried at 110° C. and 0.0099 atm pressure to prepare a coating film in which the polymer film was modi...

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Abstract

The invention relates to a method for modifying a polymer diaphragm by using polymethyl methacrylate. The method is characterized by comprising the following steps: mixing acetone with dimethylformamide according to a volume ratio (0.1-12): 1 so as to obtain a mixed solution, adding a coating agent accounting for 0.5 to 2.5 wt% of the weight of the mixed solution, then adding polymethyl methacrylate accounting for 0.5 to 2.5 wt% of the weight of the mixed solution, and carrying out stirring at 40 to 80 DEG C for 8 to 12 h so as to prepare a viscous liquid; and coating a base film having undergone radiation treatment with viscous liquid, and carrying out vacuum drying or forced air drying so as to obtain the coated diaphragm. Raw materials used in the invention are low in cost; the method is simple in preparation process, easy to operate and short in consumed time; and as the prepared coated diaphragm is used for a battery system, the internal resistance of a battery is obviously reduced, compatibility of the diaphragm with materials such as positive electrodes, negative electrodes and electrolytes is obviously improved, the discharge capacity of the battery is enhanced, the cycle performance of the battery is improved, and a good foundation is laid for industrialization.

Description

Technical field [0001] The invention relates to a method for modifying polymer films by using polymethyl methacrylate, in particular to a method for preparing coated polymer films that can be used in lithium batteries, lithium ion batteries, polymer batteries and supercapacitors. It belongs to the technical field of battery separator preparation. technical background [0002] Lithium-ion batteries have the advantages of high voltage, large capacity, no memory effect, and long life. They are widely used in digital products such as mobile phones, digital cameras, notebook computers, and power tools such as electric vehicles and hybrid electric vehicles. The separator is an important part of lithium-ion batteries. In the battery system, the separator plays a role in preventing electronic communication and conducting ions between the positive electrode and the negative electrode. The separator plays an important role in battery performance and safe use. According to different prod...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/411Y02E60/10
Inventor 童庆松陈方圆李颖胡志刚高峰席强朱德钦祖国晶马莎莎王彤
Owner FUJIAN NORMAL UNIV
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