Method for manufacturing an active material layer for a battery, an active material layer for a battery, and a battery

Abstract

To provide a manufacturing method for an active material layer for a battery that can reduce battery resistance while suppressing the reduction of battery capacity in the battery.SOLUTION: A manufacturing method for an active material layer for a battery includes the steps for preparing an active material layer which includes a binder and active material, and irradiating the active material layer with a nanosecond pulsed laser at a heat input of 0.005 J / mm2 or more and 0.050 J / mm2 or less.SELECTED DRAWING: None

Claims

1. A method for manufacturing a battery comprising a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte, wherein at least one of the positive electrode active material layer and the negative electrode active material layer is an active material layer containing a binder and an active material which is a styrene-butadiene copolymer (SBR), A step of preparing an active material layer containing a binder and an active material, which is a styrene-butadiene copolymer (SBR), A nanosecond pulsed laser is applied to the active material layer with a heat output of 0.005 J / mm². ２ 0.040J / mm or more ２ A method for manufacturing a battery, comprising producing a battery active material layer by a method for manufacturing a battery active material layer having an irradiation step of irradiating under the following conditions.

2. The method for manufacturing a battery according to claim 1, wherein the irradiation step is a step of irradiating with a nanosecond pulse laser under the conditions of an output of 1.25 W or more and 5 W or less and an overlap rate of 0% or more and 63% or less.

3. A battery comprising a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte, wherein at least one of the positive electrode active material layer and the negative electrode active material layer is a battery active material layer comprising a binder and an active material which is a styrene-butadiene copolymer (SBR), A battery in which, in the active material layer for the battery, the average particle size of the binder in the surface image obtained by EPMA mapping after staining the binder is greater than the average particle size of the binder in the image of the cross section at a depth of 20 μm obtained by EPMA mapping, and the average particle size of the binder in the surface image obtained by EPMA mapping after staining the binder is 30 μm or more.

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