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Lithium ion battery electrode and preparation method thereof and lithium ion battery

A lithium-ion battery and electrode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrode carriers/current collectors, etc., can solve the problems of limited improvement, failure to integrate current collectors and electrode materials, etc., to reduce impedance , the effect of increasing the roughness and increasing the contact area

Active Publication Date: 2020-09-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used laser method is limited to improving the surface roughness of the current collector and drawing texture to increase the contact area. Compared with the traditional method, the improvement is limited, and the fitting of the current collector and the electrode material in the true sense has not been realized.

Method used

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  • Lithium ion battery electrode and preparation method thereof and lithium ion battery
  • Lithium ion battery electrode and preparation method thereof and lithium ion battery
  • Lithium ion battery electrode and preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Example 1: (positive electrode: laser treatment + vibration treatment)

[0038] A preparation method for a positive electrode of a lithium ion battery, specifically comprising the following steps:

[0039] Step 1: Select a commercially available aluminum foil (thickness is preferably 12 µm) as the current collector of the positive electrode of the lithium-ion battery, thoroughly clean the aluminum foil with ethanol, dry it, and press it flat with mechanical force. Among them, the purchased aluminum foil is called pure aluminum.

[0040] Step 2, using a laser to engrave a pattern on the surface of the current collector. Preferably, a femtosecond laser is used for laser patterning, and the specific process is: use a spherical lens (the focal length is preferably 170 mm) to focus the laser beam process into a point shape, and use a computer-controlled two-axis (x and y) array lens The composition process is executed in the system. The pattern of this example on the surf...

Embodiment 2

[0047] Example 2: (negative electrode: laser treatment + vibration treatment)

[0048]A preparation method of a lithium ion battery negative electrode, specifically comprising the following steps:

[0049] Step 1: Select a commercially available copper foil (thickness is preferably 12 µm) as the current collector of the positive electrode of the lithium-ion battery, thoroughly clean the copper foil with ethanol, dry it, and press it flat with mechanical force. Among them, the purchased copper foil is called pure copper.

[0050] Step 2, using a laser to engrave a pattern on the surface of the current collector. Preferably, a femtosecond laser is used for laser patterning, and the specific process is: use a spherical lens (the focal length is preferably 170 mm) to focus the laser beam process into a point shape, and use a computer-controlled two-axis (x and y) array lens The composition process is executed in the system. The pattern of this example on the copper foil surface...

Embodiment 3

[0057] Example 3: (positive electrode: laser treatment only)

[0058] The difference between Example 3 and Example 1 is that only the laser is used to engrave the pattern on the surface of the aluminum foil, and the acoustic wave generator is not used for vibration treatment, and the current collector after scraping the positive electrode material is directly placed in a vacuum at 80 ° C. Dry for 24 hours to obtain the lithium ion battery positive electrode. Other steps are with embodiment 1.

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Abstract

The invention provides a lithium ion battery electrode and a preparation method thereof and a lithium ion battery. The preparation method of the lithium ion battery electrode comprises the following steps: carrying out pattern engraving treatment on the surface of a current collector by adopting a laser device; spraying an electrode material slurry on the surface of the current collector subjectedto pattern engraving treatment; and drying the current collector sprayed with the electrode material slurry to obtain the lithium ion battery electrode, wherein in the step 1, when the laser device is adopted to perform pattern engraving treatment on the surface of the current collector, an included angle between the laser head of the laser device and the surface of the current collector is 30-60degrees. According to the invention, laser treatment enables a current collector to generate a groove forming an angle with the surface of the current collector, and an electrode material can be fully embedded into the designed groove, so that the electrode material is difficult to fall off from the surface of the current collector; and according to the electrode prepared by the method, the contact area of the current collector and the electrode material is greatly increased, the resistance interface impedance is reduced, and the assembled battery is low in interface internal resistance and high in cycling stability.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion battery electrode, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Traditional battery current collectors generally only undergo ordinary roughening treatment (such as chemical corrosion, grinding, etc.) or even coat electrode materials without any treatment to make electrodes. In this case, the contact area between the electrode material and the current collector is small, and the affinity is small, so the adsorption force of the current collector to the electrode material is also small, and the electrode material is easy to fall off from the surface of the current collector. As a result, a gap is easily formed between the current collector and the electrode material, and the coating method leads to poor contact, resulting in an increase in the internal resistance of the resistance interface and poor electrode stability. Re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/13H01M4/80H01M10/0525
CPCH01M4/13H01M4/139H01M4/80H01M10/0525H01M2004/028Y02E60/10
Inventor 朱建刘星伯王娅娅李镓睿
Owner HUNAN UNIV
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