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Stretchable electrode of lithium ion battery and preparation method of stretchable electrode

A lithium-ion battery and electrode technology, applied in the field of lithium-ion battery stretchable electrodes and their preparation, can solve problems such as the influence of adhesion, and achieve the effects of low interface resistance, low process equipment requirements, and easy availability of raw materials

Active Publication Date: 2018-01-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after the existing water-based binder swells the electrolyte, its binding force will be greatly affected

Method used

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  • Stretchable electrode of lithium ion battery and preparation method of stretchable electrode
  • Stretchable electrode of lithium ion battery and preparation method of stretchable electrode
  • Stretchable electrode of lithium ion battery and preparation method of stretchable electrode

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preparation example Construction

[0050] A method for preparing a stretchable electrode for a lithium ion battery according to any one of the above claims, the specific steps are as follows:

[0051] Step 1: Add 1.0-1.5 parts by weight of thickener, 0.3-2.5 parts by weight of conductive agent, 15.0-20.0 parts by weight of positive or negative active materials in the ball mill, and mill for 60-180 minutes at a ball milling speed of 150-600 rev / min;

[0052] Step 2: Transfer the material obtained in Step 1 to a vacuum mixer with a vacuum degree of 0.3-0.5 bar, add 1.0-8.0 parts by weight of binder and 70.0-80.0 parts by weight of dispersion medium into the vacuum mixer, and stir 60-240 minutes, the stirring speed is 150-600 rpm to obtain positive electrode slurry or negative electrode slurry;

[0053] Step 3: Coat the positive electrode slurry or negative electrode slurry obtained in step 2 on the composite conductive elastomer, and dry in a vacuum oven at 60°C to 150°C for 5 to 15 hours to obtain a stretchable...

Embodiment 1

[0064] Step 1: Add 1 part by weight of carbon nanotubes and 1 part by weight of aqueous surfactant to 1000 parts by weight of water, and stir for 10 minutes at a stirring rate of 30 rpm to obtain a carbon nanotube aqueous dispersion.

[0065] The second step: 1 weight part of polystyrene-polyacrylate n-butyl acrylate-polystyrene latex and 10 weight parts of carbon nanotube aqueous dispersion were stirred for 10 minutes at a stirring speed of 30 rpm to obtain polystyrene Styrene-poly(n-butyl acrylate)-polystyrene / carbon nanotube blend. Then put the polystyrene-poly(n-butyl acrylate-polystyrene / carbon nanotube mixture) in a container, and evaporate the water to dryness at 20°C to obtain polystyrene-poly(n-butyl acrylate-polystyrene) / carbon nanotube composite film. Subsequently, the obtained polystyrene-n-butyl polyacrylate-polystyrene / carbon nanotube composite film was washed with water to remove the water-based surfactant remaining in the composite film. Put the cleaned pol...

Embodiment 2

[0079] Step 1: Add 20 parts by weight of carbon nanotubes and 100 parts by weight of an aqueous surfactant into 10,000 parts by weight of water, and stir for 120 minutes at a stirring rate of 600 rpm to obtain an aqueous dispersion of carbon nanotubes.

[0080] The second step: 10 parts by weight of polystyrene-isobutyl polyacrylate-polystyrene latex and 10 parts by weight of carbon nanotube aqueous dispersion were stirred for 120 minutes at a stirring rate of 600 rpm to obtain polystyrene Styrene-isobutyl polyacrylate-polystyrene / carbon nanotube blend. Then put the polystyrene-isobutyl polyacrylate-polystyrene / carbon nanotube mixture in a container, and evaporate the water to dryness at 80°C to obtain polystyrene-isobutyl polyacrylate-polystyrene / carbon nanotube composite film. Subsequently, the obtained polystyrene-isobutyl polyacrylate-polystyrene / carbon nanotube composite film was washed with water to remove the water-based surfactant remaining in the composite film. P...

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Abstract

The invention relates to a stretchable electrode of a lithium ion battery and a preparation method of the stretchable electrode. The stretchable electrode of the lithium ion battery is prepared by coating lithium ion battery positive or negative paste on a segmented copolymer / carbon nanotube composite conductive elastic body. The prepared stretchable electrode can maximum bear stretching deformation exceeding 100% and possesses electrochemical performance equivalent to that of a metal electrode. A segmented copolymer is employed as a lithium ion battery binding agent, and favorable adhesive property on an active substance and a conductive agent of the battery is achieved, the stretchable electrode has high elasticity after a liquid electrolyte is swelled, close contact of a substance on asurface of the electrode and a current collector still can be maintained after the electrode is substantially stretched and deformed for many times, and the favorable electrochemical performance of the stretchable electrode can be further favorably maintained. The stretchable electrode is available in raw material, and the process is simple and environmental-friendly.

Description

technical field [0001] The invention relates to an electrode of a lithium ion battery, in particular to a stretchable electrode of a lithium ion battery and a preparation method thereof. Background technique [0002] Recently, with the development of stretchable electronic devices, people have also put forward stretchable requirements for the energy storage devices in them. Due to the advantages of high energy density and good cycle performance, lithium-ion batteries as energy storage devices have been widely studied and applied. However, the existing lithium-ion batteries are too rigid to meet the needs of stretchable electronic devices to withstand deformations such as bending, twisting, and stretching. It is imperative. In order to realize the stretchability of lithium-ion batteries, finding and preparing stretchable battery materials is a feasible method. These battery materials not only need to meet mechanical flexibility, some of them also have good electrical condu...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/66H01M4/139H01M4/04C09D153/00C09D7/61
CPCY02E60/10
Inventor 高翔周遨罗英武
Owner ZHEJIANG UNIV
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