Battery, vehicle, electronic device and battery manufacturing method
A negative-electrode active material layer formed between a negative-electrode current collector and a solid electrolyte layer has a line-and-space structure in which a plurality of stripe-shaped pattern elements extending in a Y direction are arranged while being separated from each other. A gradient at each contact point where the stripe-shaped pattern element, the negative-electrode current collector and the solid electrolyte layer are in contact with each other is made smaller than 90°.
1. A battery comprising a first current collector layer, a first active material layer, an electrolyte layer, a second active material layer and a second current collector layer laminated in this order, wherein,
the first active material layer has a line-and-space structure in which a plurality of stripe-shaped pattern elements containing an active material, extending in an extending direction along a surface of the first current collector layer and being parallel to each other are arranged on the surface of the first current collector layer; wherein the first current collector layer and the electrolyte layer are in contact with each other at the contact points of the stripe-shaped pattern elements and the first current collector layer; and
an angle formed between the surface of the first current collector layer and a tangent drawn to the first active material layer at a contact point of each stripe-shaped pattern element and the first current collector layer is smaller than 90°.
2. The battery according to claim 1 , wherein the stripe-shaped pattern elements extend continuously along the surface of the first current collector layer.
3. The battery according to claim 1 , wherein a cross-sectional shape of each stripe-shaped pattern element along a section orthogonal to the extending direction is such that a width of a portion in contact with the first current collector layer is 20 μm to 300 μm, a maximum height taken orthogonal to the first current collector layer is 10 μm to 300 μm and a ratio of the height to the width is equal to or larger than 0.5.
4. The battery according to claim 1 , wherein:
the electrolyte layer contains a solid electrolyte material; and
surfaces of the stripe-shaped pattern elements except the portions in contact with the first current collector layer are smooth curved surfaces.
5. The battery according to claim 1 , wherein the first active material layer includes connecting parts connecting the plurality of stripe-shaped pattern elements to each other.
6. A vehicle, comprising:
a motor; and
the battery according to claim 1 arranged for supplying power to the motor.
7. An electronic device, comprising:
the battery according to claim 1 ; and
a circuit unit which operates using the battery as a power supply.
8. The electronic device according to claim 7 , further comprising a card type housing for holding the battery and the circuit unit.
9. A battery manufacturing method, the battery comprising:
a first current collector layer, a first active material layer, an electrolyte layer, a second active material layer and a second current collector layer laminated in this order, wherein,
the first active material layer has a line-and-space structure including a plurality of stripe-shaped pattern elements containing an active material extending in an extending direction along a surface of the first current collector layer and being parallel to each other;
wherein the first current collector layer and the electrolyte layer are in contact with each other at the contact points of the stripe-shaped pattern elements and the first current collector layer; and
an angle formed between the surface of the first current collector layer and a tangent drawn to the first active material layer at a contact point of each stripe-shaped pattern element and the first current collector layer is smaller than 90°; the method comprising:
a first step of forming a first active material layer, which has a line-and-space structure composed of a plurality of stripe-shaped pattern elements extending in an extending direction along a surface of a base material which will become a first current collector layer; and
a second step of laminating an electrolyte layer covering exposed surfaces of the base material not covered by the first active material layer and a surface of the first active material layer, a second active material layer and a second current collector layer;
wherein, in the first step, an angle formed between the surface of the first current collector layer and a tangent drawn to the first active material layer at a contact point of each stripe-shaped pattern element and the first current collector layer is smaller than 90°,
wherein, in the first step, the first active material layer is formed by applying an application liquid that contains an active material, discharged from a nozzle by a plurality of dispense openings thereof to the surface of the base material so as to form said plurality of stripe-shaped elements; and
the application liquid is applied in stripes on the surface of the base material by relatively moving the nozzle in a predetermined direction with respect to the surface of the base material so that the first active material layer has the line-and-space structure in which the plurality of the stripe-shaped pattern elements are parallel to each other.
10. The battery manufacturing method according to claim 9 , wherein, in the first step, the application liquid is continuously discharged from the dispense openings of the nozzle to the surface of the base material so as to form said plurality of stripe-shaped pattern elements.
11. A battery, comprising a first current collector layer, a first active material layer, a electrolyte layer, a second active material layer and a second current collector layer, wherein,
the first current collector layer, the first active material layer, the electrolyte layer, the second active material layer and the second current collector layer are laminated in this order and manufactured by the manufacturing method according to claim 9 .
12. The battery according to claim 3 , wherein said width is about 170 μm and said maximum height is about 100 μm.
13. The battery according to claim 12 , wherein said angle is about 60°.
14. The battery according to claim 1 , wherein said angle is about 60°.
15. The battery according to claim 1 , wherein a length of the stripe-shaped pattern elements in the extending direction is larger than both a width of a portion in contact with the first current collector layer and a height of the stripe-shaped pattern elements.
16. The battery according to claim 1 , wherein in the first active material layer, one stripe-shaped pattern element which extends longitudinally and continuously in the extending direction is disposed in the extending direction, and plural stripe-shaped pattern elements are arranged in orthogonal direction to the extending direction.
17. The battery according to claim 16 , wherein each stripe-shaped pattern element extends continuously from one end to another end of the first current collector layer in the extending direction.
18. The battery according to claim 16 , wherein a width of a portion in contact with the first current collector layer is constant in the extending direction.