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Secondary battery

A secondary battery and conductive material technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of battery cycle characteristics deterioration, current collector deterioration, lithium consumption, etc., achieve good electronic conductivity and prevent deterioration , Improve the effect of cycle characteristics

Active Publication Date: 2014-01-08
SHOKO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it can be seen that not only lithium is consumed, but also the current collector itself is degraded, which significantly deteriorates the cycle characteristics of the battery.
Therefore, it is usually difficult to use aluminum foil in the negative electrode

Method used

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Examples

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Effect test

Embodiment

[0122] Examples and comparative examples are shown below to further describe the present invention in detail. In addition, the scope of the present invention is not limited by this embodiment. The secondary battery and the power supply system of the present invention can be appropriately modified and implemented without changing the gist of the present invention.

manufacture example

[0124] Disperse the raw materials shown in Table 1 for 10 minutes at a speed of 300 rpm using a Dissolver-type mixer, and further process them with a homogenizer (manufactured by Iada Trading Co., Ltd., product name PRO200) at 20,000 rpm for 30 seconds to fully disperse , to produce a coating solution.

[0125] Next, an aluminum foil made of an A1085 material and having a thickness of 30 μm (thickness of the oxide film: 3 nm) was prepared after alkali cleaning. Depending on the thickness of the film to be formed, the coating liquid was applied to one side of the aluminum foil by a bar coating method using a Meyer rod #0, #1, or #2. Then, it heat-dried at 180 degreeC in air|atmosphere for 3 minutes. The coating was similarly applied to the other surface in the same manner, followed by heating and drying to obtain current collectors 1 to 6 having a resin film.

Embodiment 1～6

[0143] (manufacturing of secondary batteries)

[0144] The aforementioned current collectors 1 to 6 were each cut out to a size of 10 cm×10 cm. 94 parts by mass of artificial graphite (manufactured by Showa Denko Co., Ltd., trade name SCMG-AR) as a negative electrode active material, acetylene black (manufactured by Denki Kagaku Kogyo Co., Ltd., trade name denka black (powder)) as a conductive additive ) 1 mass part, 5 mass parts of polyvinylidene fluoride (manufactured by Co., Ltd. Kureha, trade name KF Polymer #9130) as a binder, 94 N-methyl-2-pyrrolidone (industrial grade) as a dispersion solvent Parts by mass were mixed to obtain a slurry, and the slurry was applied to both surfaces of current collectors 1 to 6, dried and pressed to form a negative electrode active material layer with a thickness of 55 μm on one side, thereby producing a negative electrode.

[0145] On the other hand, 95 parts by mass of lithium cobaltate (manufactured by Nippon Chemical Industry Co., Ltd...

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Abstract

The invention discloses a secondary battery which is provided with a positive electrode and a negative electrode. The negative electrode comprises a negative electrode collector and a negative electrode active material layer, and the negative electrode collector comprises a base that is formed of an aluminum foil and a resin coating film that has a thickness of 0.01-5 [mu]m and does not allow permeation of a nonaqueous electrolyte solution.

Description

technical field [0001] The present invention relates to secondary batteries. The present invention more particularly relates to a secondary battery using aluminum foil as a negative electrode current collector. [0002] This application claims the priority of Japanese Patent Application No. 2011-098316 for which it applied to Japan on April 26, 2011, The content is used here. Background technique [0003] In recent years, there has been a demand to reduce the amount of carbon dioxide produced in order to suppress global warming. For example, in the automobile industry, the transition from gasoline vehicles to electric vehicles and hybrid vehicles equipped with secondary batteries that emit less carbon dioxide is expanding. Among them, the development of lithium-ion secondary batteries, which affect the mileage, safety, and reliability of vehicles, has attracted attention. A lithium ion secondary battery generally includes a positive electrode current collector and a negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525H01M10/0568H01M10/0569
CPCY02E60/12H01M4/661H01M10/0525H01M4/663H01M4/666H01M4/668H01M10/0569H01M4/667H01M4/133Y02E60/10H01M4/66H01M10/0568
Inventor 横内仁大森将弘国泽政智
Owner SHOKO CO LTD
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