JP2013008523A5

JP2013008523A5 - BATTERY ELECTRODE, METHOD FOR MANUFACTURING THE SAME, AND SECONDARY BATTERY

Info

Publication number: JP2013008523A5
Application number: JP2011139665A
Authority: JP
Filing date: 2011-06-23
Publication date: 2014-07-24
Anticipated expiration: 2031-06-23

Claims

A battery electrode, wherein a mixture layer containing an active material is formed on the surface of a current collector,
The mixture layer, porosity have a different configuration depending on the direction of the position along the surface of the current collector,
The mixture layer has a plurality of regions different in porosity from one another,
The current collector is made of a strip of metal foil,
In the mixture layer, the plurality of regions are disposed in the width direction of the current collector,
The mixture layer has a first mixture layer region and a second mixture layer region having a lower porosity than the first mixture layer region, and the first mixture layer region And the second mixture layer regions are alternately arranged in the width direction of the metal foil .

2. The battery electrode according to claim 1 , wherein in the mixture layer, an arrangement interval of the second mixture layer region is 1 or more and less than 10 times a thickness of the mixture layer.

The battery electrode according to claim 1, wherein the mixture layer has a concavo-convex shape in cross section, and the void ratio of the recess and the void ratio of the protrusion are different.

The battery electrode according to claim 3 , wherein a porosity of the convex portion of the mixture layer is higher than a porosity of the concave portion.

A secondary battery comprising the battery electrode according to any one of claims 1 to 4.

Applying a mixture containing an active material on the surface of the current collector to form a mixture layer having irregularities on the surface;
Compressing the mixture layer to flatten the surface of the mixture layer;
A method of manufacturing a battery electrode comprising:

In the step of forming the mixture layer having irregularities on the surface, the current collector is moved in a direction along the surface of the current collector, and the current collector is disposed so as to face the surface of the current collector. The mixture slurry containing the mixture is discharged from a slit die which extends in a direction perpendicular to the moving direction of the second pair and has a slit width narrowed at a predetermined interval in the extension direction,
In the step of flattening the surface of the mixture layer, the battery according to claim 6, characterized in that the outer peripheral surface to pass by sandwiching the mixture layer and the current collector between the pair of flat rollers Method of manufacturing electrodes.

Applying a mixture containing an active material on the surface of the current collector to form a mixture layer having a flat surface;
Pressure-compressing the mixture layer to form asperities on the surface of the mixture layer;
A method of manufacturing a battery electrode comprising:

In the step of forming the mixture layer having a flat surface, the current collector is moved in a direction along the surface of the current collector, and is disposed so as to face the surface of the current collector. The mixture slurry containing the mixture is discharged from a slit die extending with a constant slit width in a direction orthogonal to the moving direction,
In the step of forming irregularities on the surface of the mixture layer, according to claim 8, characterized in that passing by sandwiching the mixture layer and the current collector between the pair of rollers having an uneven outer peripheral surface Method of producing a battery electrode.