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Positive electrode current collector for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and positive electrode current collector for lithium ion secondary battery

A positive current collector, secondary battery technology, applied in secondary batteries, electrode carriers/current collectors, battery electrodes, etc., can solve problems such as poor adhesion, reduced battery life, peeling, etc., to improve adhesion and battery life. Enhanced, easy and sure-to-manufacture effects

Inactive Publication Date: 2016-02-17
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, such an oxide film is generally poor in adhesion to carbon (C), so even if a carbon intermediate film is formed on the surface of the current collector as in the inventions of Patent Document 1 and Patent Document 2, the carbon (C) film will still occur along with charging and discharging. The problem of peeling off the carbon interlayer from the current collector
In addition, if the carbon intermediate film is peeled off from the current collector in this way, the active material layer covered on it is also peeled off at the same time, so it also becomes a factor of reduced battery life.
Therefore, the inventions of Patent Document 1 and Patent Document 2 cannot improve the adhesion of the interface between the current collector and the active material layer.

Method used

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  • Positive electrode current collector for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and positive electrode current collector for lithium ion secondary battery
  • Positive electrode current collector for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and positive electrode current collector for lithium ion secondary battery
  • Positive electrode current collector for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and positive electrode current collector for lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0088] Next, an example of comparing the adhesion force at the interface between the current collector and the positive electrode active material layer will be shown with respect to a positive electrode satisfying the requirements of the present invention and a positive electrode not satisfying the requirements of the present invention. First, the positive electrode used in this example will be described along the manufacturing process. In addition, Comparative Example 4 of this embodiment assumes a positive electrode in which a carbon interlayer film is formed on a current collector made of a conductive material described in Patent Document 1 above.

[0089] (1) Aluminum foil manufacturing process

[0090] In the aluminum foil manufacturing process, the same treatment was performed in Examples 1-12 and Comparative Examples 1-10. That is, an aluminum plate was rolled to produce an aluminum foil having a length of 50 mm x a width of 50 mm x a thickness of 15 μm.

[0091] (2) ...

no. 2 example

[0108] Next, in order to investigate more preferable forms of the current collector and the positive electrode of the present invention, an example of comparing the wettability of the surface of the current collector will be shown. In addition, this characteristic is merely a desired characteristic of the present invention, so even if this characteristic is not satisfied, the minimum object of the present invention can be achieved if the adhesive force of the first embodiment is satisfied. In this example, using Examples 1-12 and Comparative Examples 1-3, 5-8 manufactured by the same manufacturing process as the said 1st Example, the following measurement and evaluation were performed.

[0109] (1) Measurement of the composition of the surface layer

[0110] After the aforementioned surface layer forming process, the composition of the surface layer was measured by AES.

[0111] (2) Measurement and evaluation of water contact angle

[0112] After the aforementioned surface l...

no. 3 example

[0120] Next, in order to investigate more preferable forms of the current collector and positive electrode of the present invention, examples of comparative corrosion resistance will be shown. In addition, this characteristic is merely a desired characteristic of the present invention, so even if this characteristic is not satisfied, the minimum object of the present invention can be achieved if the adhesive force of the first embodiment is satisfied. In this example, the following treatments were performed using Examples 3 to 5, 8, 9, and 13 and Comparative Examples 8 to 10 manufactured by the same manufacturing steps as in the first example described above.

[0121] (1) Measurement of the composition of the surface layer

[0122] After the aforementioned surface layer forming process, the composition of the surface layer was measured by AES.

[0123] (2) Evaluation of corrosion resistance

[0124] Using the positive electrode produced by the above method, a battery cell wa...

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Abstract

Disclosed is a positive electrode current collector for a lithium ion secondary battery, which is characterized by comprising an aluminum foil comprising pure aluminum or an aluminum alloy and a surface layer formed on one surface or both surfaces of the aluminum foil, wherein the surface layer contains C in an amount of 10 to 95 at.% and additionally contains at least one element selected from Group 4 to Group 6 elements in an amount of 5 to 90 at.%. Also disclosed is a positive electrode for a lithium ion secondary battery, which is characterized by having a positive electrode active material layer that covers the surface layer of the positive electrode current collector for a lithium ion secondary battery. It becomes possible to prevent the elution of the current collector into an electrolytic solution to improve the adhesion between the current collector and the active material in the interface therebetween and increase the service life of a battery.

Description

technical field [0001] The invention relates to a positive electrode current collector used in a lithium ion secondary battery, a positive electrode and a method for manufacturing the positive electrode current collector. Background technique [0002] In recent years, due to the downsizing and high performance of mobile devices, there has been an increasing demand for energy density (charge and discharge capacity) of secondary batteries mounted on the mobile devices. Among them, lithium-ion secondary batteries (hereinafter, referred to as secondary batteries for short) are compared with nickel-cadmium secondary batteries and nickel-hydrogen secondary batteries, etc., so they show higher voltage and higher energy density, so they are widely used Used as a power source for mobile devices. In addition, with the improvement of environmental awareness, it is expected to switch from the current fossil fuel vehicles to CO 2 Electric vehicles and hybrid vehicles with low emissions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/70
CPCH01M4/661H01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 桂翔生佐藤俊树铃木顺细川护大西隆
Owner KOBE STEEL LTD
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