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Method for preparing lithium ion battery membrane via radiation grafting modification by using polypropylene film

A polypropylene film and lithium-ion battery technology, which is applied to battery pack components, circuits, electrical components, etc., can solve problems such as difficult electrolyte solution soaking, and achieve low cost, convenient operation, and high ion conductivity.

Inactive Publication Date: 2011-11-23
JINYOUNG XIAMEN ADVANCED MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polyolefin films exhibit good electrochemical stability in lithium batteries, they are difficult to be completely wetted by electrolyte solutions due to their inherent hydrophobicity.

Method used

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  • Method for preparing lithium ion battery membrane via radiation grafting modification by using polypropylene film
  • Method for preparing lithium ion battery membrane via radiation grafting modification by using polypropylene film
  • Method for preparing lithium ion battery membrane via radiation grafting modification by using polypropylene film

Examples

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Embodiment 1

[0020] The preparation process and steps in the examples are as follows:

[0021] (1) first prepare the grafting reaction solution of volume ratio GMA:DMF=15:85; Add ferrous ammonium sulfate 0.02wt% in addition;

[0022] (2) Then clean the polypropylene film with acetone and dry it to constant weight, put the weighed film into a polyethylene film bag, and fill the bag with high-purity nitrogen to drive away the air, seal it Placed in an electron irradiation room for irradiation; the electron beam current intensity is 2mA, and the total irradiation dose is 100kGy;

[0023] (3) Roll the irradiated film on a glass rod, place it in a graft tube filled with GMA and DMF after tying it up, fill the graft tube with nitrogen and seal it, place the graft tube in a constant temperature water-dissolving tank at 50°C, and graft After 2 hours of reaction, the grafted membrane was taken out from the graft tube, washed with DMF, and then soaked in DMF for 8 hours to remove the homopolymer on...

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Abstract

The present invention relates to a method for preparing lithium ion battery membrane via radiation grafting modification by using a polypropylene film, belonging to the technical field of high polymer material modification. The method comprises the main processes of: (1) preparing a grafting reaction reagent system and using methacrylic acid shrinkage glyceride with the volume ratio of 15 percent, solvent N,N-dimethylformamide with the volume ratio of 85 percent and a proper amount of inhibitor ammonium ferrous sulfate to form the reagent system; (2) placing a polypropylene film to be processed in a polyethylene bag, filling with nitrogen and placing in an electron irradiation room after being sealed for irradiation, wherein the electron beam intensity is 2mA and the irradiation dose is 100kGy; and (3) placing the irradiated polypropylene film in the mixed solution of the reaction reagent system, performing grafting reaction for 2 hours under the condition of constant-temperature water bath at 50 DEG C, washing and drying to obtain the polypropylene battery membrane via grafting modification. The membrane has favorable electrochemistry property via constant-current charging and discharging test in the lithium ion battery.

Description

technical field [0001] The invention relates to a method for preparing a lithium-ion battery diaphragm by radiation grafting modification of a polypropylene film, belonging to the technical field of polymer material modification. Background technique [0002] Microporous films made of polyolefins (polyethylene, polypropylene, or a composite of both) are widely used as lithium battery separators. Although polyolefin films exhibit good electrochemical stability in lithium batteries, they are difficult to be completely wetted by electrolyte solutions due to their inherent hydrophobicity. Therefore, it is very necessary to modify the polyolefin film to improve its affinity to the electrolyte solution. The modification of such polyolefin films can be achieved by using different methods including physical and chemical means. Grafting functional groups such as ester groups onto polypropylene film can greatly improve its ability to absorb and retain electrolyte solutions, and impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/18C08L23/12C08L51/06H01M2/16H01M50/403H01M50/417H01M50/489H01M50/497
CPCY02E60/12Y02E60/10
Inventor 俎建华张剑秋罗文芸严峰吴铮
Owner JINYOUNG XIAMEN ADVANCED MATERIALS TECH CO LTD
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