Method for preparing high-performance lithium-ion battery diaphragm through vacuum ultraviolet grating modification

A lithium-ion battery, graft modification technology, applied in battery pack parts, circuits, electrical components and other directions, can solve the problems of difficult mass production, industrialized production, unfavorable production efficiency, long graft reaction time, etc. Achieve the effects of strong antioxidant capacity, improved affinity, and high cycle life

Active Publication Date: 2014-01-22
河南惠强新能源材料科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent application CN101735470A discloses that the polypropylene film to be treated is irradiated with electron beams, and grafted for 2 hours at 50°C to prepare a polypropylene battery separator grafted with glycidyl methacrylate. Constant current char

Method used

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  • Method for preparing high-performance lithium-ion battery diaphragm through vacuum ultraviolet grating modification

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Embodiment 1

[0018] A method for preparing a high-performance lithium-ion battery separator by vacuum ultraviolet grafting modification: the polyethylene lithium-ion battery separator is exposed to an irradiation intensity of 14mW / cm 2 In the vacuum ultraviolet ray, irradiate for 30 seconds, the total amount of radiation is 420mJ / cm 2 ; Immerse the irradiated diaphragm rapidly in the methyl methacrylate monomer solution, perform grafting reaction for 5 seconds, take it out, quickly volatilize the unreacted monomer at 80°C, and finally obtain the graft-modified methyl methacrylate polyethylene lithium-ion battery separator.

Embodiment 2

[0020] A method for preparing a high-performance lithium-ion battery separator by vacuum ultraviolet grafting modification: the polyethylene lithium-ion battery separator is exposed to an irradiation intensity of 14mW / cm 2 In the vacuum ultraviolet ray, irradiate for 20 seconds, and the total amount of radiation is 280mJ / cm 2 Immerse the irradiated separator rapidly in the methyl acrylate monomer solution, perform grafting reaction for 5 seconds, take it out, quickly volatilize the unreacted monomer at 90°C, and finally obtain the polyethylene lithium grafted with methyl acrylate Ion battery separator.

Embodiment 3

[0022] A method for preparing a high-performance lithium-ion battery separator by vacuum ultraviolet grafting modification: the polyethylene lithium-ion battery separator is exposed to an irradiation intensity of 14mW / cm 2 In the vacuum ultraviolet ray, irradiate for 20 seconds, and the total amount of radiation is 280mJ / cm 2 ; Immerse the irradiated diaphragm rapidly in the glycidyl methacrylate monomer solution, graft the reaction for 5 seconds, take it out, quickly volatilize the unreacted monomer at 90°C, and finally obtain the glycidyl methacrylate graft Modified polyethylene lithium ion battery separator.

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Abstract

The invention discloses a method for preparing a high-performance lithium-ion battery diaphragm through vacuum ultraviolet grating modification. The method comprises the steps of: irradiating a polyolefin diaphragm by using a vacuum ultraviolet lamp under the protection of nitrogen; after the irradiation, immediately placing in a monomer under pure nitrogen protection and carrying out a grafting reaction; and volatilizing un-grafted monomers to obtain the high-performance lithium-ion battery diaphragm subjected to grafting modification. According to the method for preparing the high-performance lithium-ion battery diaphragm through vacuum ultraviolet grating modification, disclosed by the invention, the defects of low efficiency and complicated preparation process of an existing grating method are overcome, a polar material is rapidly grafted on the surface of the polyolefin diaphragm, and the affinity and the oxidization resistance of an electrolyte of the diaphragm are improved, thus the high-performance lithium-ion battery diaphragm with high magnification, high cycle service life and strong oxidization resistance capacity is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing high-performance lithium-ion battery separators through vacuum ultraviolet grafting modification. Background technique [0002] At present, the separators widely used in lithium-ion batteries are mainly made of polyolefins (polyethylene, polypropylene, or a composite of the two). Polyolefin is a non-polar material, and the electrolyte usually uses polar substances such as dimethyl carbonate and ethylene carbonate as solvents. Therefore, the poor compatibility between the diaphragm and the electrolyte makes it difficult for the prepared membrane to be completely infiltrated by the electrolyte solution, resulting in poor liquid absorption. In addition, the polyethylene separator also has the disadvantage of poor oxidation resistance, and is easily oxidized in the battery to cause yellowing and blackening, and the battery capacity decreases. Th...

Claims

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Application Information

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IPC IPC(8): C08J7/18H01M2/16H01M50/403H01M50/414
CPCY02E60/12Y02E60/10
Inventor 李文锋吴耀根蔡朝辉廖凯明
Owner 河南惠强新能源材料科技股份有限公司
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