Electrode stack, battery, method for manufacturing an electrode stack, and method for manufacturing a battery

Abstract

The present disclosure aims to provide an electrode stack, a battery, a method for manufacturing an electrode stack, and a method for manufacturing a battery that can improve the diffusivity of the electrolyte and the gas discharge during charging and discharging while maintaining the opposing area between the positive electrode active material layer and the negative electrode active material layer. [Solution] The electrode laminate of the present disclosure is an electrode laminate 100 having an active material layer 140 and a current collector layer 120 in contact with the active material layer 140, wherein the active material layer 140 has a void 160 with a maximum dimension of 10 μm or more on the surface of the active material layer 140 on the current collector layer 120 side and / or within the layer of the active material layer 140.

Claims

1. An electrode laminate having an active material layer and a current collector layer in contact with the active material layer, The surface of the active material layer facing the current collector layer, and / or within the active material layer, has voids with a maximum dimension of 10 μm or more. Electrode stack.

2. The electrode laminate according to claim 1, wherein the maximum dimension is 10 mm or more.

3. The electrode laminate according to claim 1, wherein the density of the active material layer on the stacking direction side of the void is substantially the same as the density of the active material layer in the area without the void.

4. The electrode laminate according to claim 1, wherein at least a portion of the surface of the current collector layer on the active material layer side is subjected to chemical conversion treatment.

5. The electrode laminate according to claim 1, wherein the void has at least one of the following structures: (i) A structure in which the void extends in the planar direction so as to spread substantially radially from the end face side near the injection hole of the active material layer toward the other end face side of the active material layer. (ii) A structure in which the void forms a branched channel that extends in the planar direction, (iii) A structure in which the void does not reach at least one edge of the active material layer, (iv) The void has a spiral or spiderweb-like structure.

6. A battery having an electrode stack according to any one of claims 1 to 5.

7. (a) Applying ethylene carbonate in a predetermined pattern to the surface of the current collector layer or the surface of the electrode mixture layer on the current collector layer. (b) Applying the electrode mixture layer to the surface of the current collector layer or the electrode mixture layer to which ethylene carbonate is applied, thereby forming an active material layer, (c) Dissolve and / or melt the ethylene carbonate contained in the active material layer to form the voids corresponding to the predetermined pattern. A method for manufacturing an electrode stack according to any one of claims 1 to 5, or a method for manufacturing a battery according to claim 6.

8. The method according to claim 7, wherein in step (c), an electrolyte is injected into the active material layer to dissolve the ethylene carbonate.

9. The method according to claim 8, wherein the electrolyte does not contain ethylene carbonate.

10. The method according to claim 7, comprising heating the current collector layer, or the electrode mixture layer on the current collector layer, at least partially, before step (a).

11. The method according to claim 7, comprising cooling the current collector layer after step (a) and before step (b).

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