Metal foil for current collector, current collector, and method for manufacturing metal foil for current collector

A current collector and metal foil technology, which is applied in the manufacture of hybrid/electric double layer capacitors, non-aqueous electrolyte battery electrodes, battery electrodes, etc., can solve problems such as difficulty in maintaining equipment performance for a long time, reduced charge and discharge characteristics, and reduced equipment performance , to achieve the effect of reducing electrode resistance, improving charge and discharge characteristics, and reducing contact resistance

Inactive Publication Date: 2017-02-15
FURUKAWA SKY ALUMINUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, if the active material falls off from the metal foil, it will cause problems such as a decrease in capacity, a decrease in charge and discharge characteristics, or a short circuit between electrodes, which will cause a decrease in the performance of the device.
In addition, it may be difficult to maintain the performance of the device for a long time in the case where the active material is easily detached from the metal foil

Method used

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  • Metal foil for current collector, current collector, and method for manufacturing metal foil for current collector
  • Metal foil for current collector, current collector, and method for manufacturing metal foil for current collector
  • Metal foil for current collector, current collector, and method for manufacturing metal foil for current collector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A pair of roughening rollers 6 are prepared in advance in the following procedure. First, a pair of rolling rolls 60 are subjected to shot peening processing using projection grid particles with a particle size of 40 μm, and the surfaces 600 of the two rolling rolls 60 are image 3 The surface is roughened as shown. Next, the surface 600 of the rolling roll 60 is subjected to chromium plating treatment to form a chromium plating film 61. The chromium plating treatment is carried out in a Sargent bath containing 250g / L of chromic anhydride and 2.5g / L of sulfuric acid at a temperature of 50℃ and a current density of 30A / dm 2 Conditions. The film thickness of the chromium plating film 61 is 5 μm. Such as Figure 4 As shown, the chromium plating film 61 has a plurality of substantially spherical convex portions 610 by preferentially adhering to the sharp portion of the surface 600.

[0071] After that, the pair of rolling rolls 60 on which the chromium plating film 61 was fo...

Embodiment 2

[0075] Except that the particle size of the projection grid particles and the rolling load in the step of crushing the top of the chrome plating film 61 were changed to the conditions shown in Table 1, a pair of roughening rollers 6 were produced in the same manner as in Example 1. Using the obtained roughened roll 6, the surface shape was transferred to a rolled copper foil having a thickness of 10 μm under the same conditions as in Example 1 to obtain a metal foil E2. The average L of the Fret diameter of the concave part 4 on the metal foil E2 ave It is 10.1 μm, and the depth of the concave portion 4 is 2.0 μm at the deepest.

Embodiment 3

[0077] Except that the particle size of the projection grid particles and the rolling load in the step of crushing the top of the chrome plating film 61 were changed to the conditions shown in Table 1, a pair of roughening rollers 6 were produced in the same manner as in Example 1. Using the obtained roughened roll 6, the surface shape was transferred to a rolled copper foil having a thickness of 10 μm under the same conditions as in Example 1 to obtain a metal foil E3.

[0078] As an example of the metal foil 1 having a plurality of concave portions, Image 6 It shows the SEM (scanning line electron microscope) image of the roughened surface of the metal foil E3. Such as Image 6 It can be seen that the roughened surface of the metal foil E3 is formed with a plurality of concave portions 4 having a substantially circular shape, a substantially elliptical shape, or a shape in which these are overlapped. In addition, the presence of rolling traces or oil pits during foil rolling i...

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Abstract

The invention relates to a metal foil for a current collector, a current collector, and a method for manufacturing a metal foil for a current collector. A metal foil (1) for a current collector has at least one surface that is roughened. The roughened surface has a plurality of recessed sections (4) having a bottom-surface part (2) and edge parts (3) that surround the bottom-surface part (2) and protrude beyond the bottom-surface part (2). The average of the Feret diameter of the recessed sections (4) (Lave) is 0.5-50 [mu]m. The metal foil (1) for a current collector is suitable for a lithium-ion secondary cell, a sodium secondary cell, an electric double-layer capacitor, or an electrode collector for a lithium-ion capacitor.

Description

Technical field [0001] The present invention relates to a method of manufacturing metal foil for a current collector, a current collector, and a metal foil for a current collector. Background technique [0002] Current collectors used in devices such as secondary batteries and capacitors are constructed by fixing electrode active materials on the surface of metal foil. [0003] For example, for the negative electrode current collector of a lithium ion secondary battery, a slurry obtained by mixing and dispersing a negative electrode active material containing carbon powder, a binder, and a conductive agent in a solvent, is applied to a metal foil, After the coating layer is formed, the coating layer is dried to remove the solvent. Thereafter, in order to increase the inner density of the negative electrode active material, a pressure bonding step is performed as necessary. In this way, a negative electrode current collector having an active material-containing layer on the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/70H01M4/13H01M4/64H01M4/66B21D33/00B30B3/00C25D7/00H01G11/70H01G11/86
CPCC25D7/00H01G11/70H01G11/86H01M4/64H01M4/70Y02E60/13C25D1/04C25D3/08C25D5/48H01G11/68H01M4/661Y02E60/10B21D33/00B30B3/00H01M4/13C25D7/0614C25D3/56H01M10/0525H01M10/054H01M2004/021
Inventor 芦泽公一本居徹也小石川敦史船户宁
Owner FURUKAWA SKY ALUMINUM CORP
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