Method for producing all solid state battery and all solid state battery
A method for producing an all solid state battery including a first current collector, a first active material layer, a solid electrolyte layer, a second active material layer and a second current collector stacked in this order, the method comprising: a transferring step of transferring a transfer layer onto the first current collector by using a transfer member including a transfer foil and the transfer layer, the transferring step being included in a step of forming at least one layer of the first active material layer, the solid electrolyte layer, and the second active material layer, and the transfer layer includes a binder, and in a thickness direction, a binder concentration of a surface portion on opposite side to the transfer foil is higher than a binder concentration of a surface portion on the transfer foil side.
1. A method for producing an all solid state battery including a first current collector, a first active material layer, a solid electrolyte layer, a second active material layer and a second current collector stacked in this order, the method comprising:
a transferring step of transferring a transfer layer onto the first current collector by using a transfer member including a transfer foil and the transfer layer, the transferring step being included in a step of forming at least one layer of the first active material layer, the solid electrolyte layer, and the second active material layer, and
the transfer layer includes a binder, and in a thickness direction, a binder concentration of a surface portion on opposite side to the transfer foil is higher than a binder concentration of a surface portion on the transfer foil side.
2. The method for producing an all solid state battery according to claim 1 , wherein in the transferring step, the transfer layer is transferred onto a transfer receiving layer formed on the first current collector, and
the transfer receiving layer includes a binder, and in a thickness direction, a binder concentration of a surface portion on opposite side to the first current collector is higher than a binder concentration of a surface portion on the first current collector side.
3. The method for producing an all solid state battery according to claim 2 , wherein the transfer receiving layer is the first active material layer, and
the transfer layer is a layer including the solid electrolyte layer as an outermost layer.
4. The method for producing an all solid state battery according to claim 2 , wherein the first active material layer is a stacked body including at least two layers or more of active material constituting layers,
the transfer receiving layer is a n th active material constituting layer wherein n is an integer of one or more, and
the transfer layer is a (n+1) th active material constituting layer.
5. The method for producing an all solid state battery according to claim 1 , wherein, in a thickness direction of the transfer layer, when a region from a midportion to a surface portion on the transfer foil side is regarded as a first region and a region from the midportion to a surface portion on opposite side to the transfer foil is regarded as a second region, a proportion of a binder concentration of the second region to a binder concentration of the first region is 105% or more and 190% or less.