Method for manufacturing an electrode active material layer and method for manufacturing a battery

Abstract

This disclosure provides a method for manufacturing an electrode active material layer that can improve the capacity retention rate of a battery, and a method for manufacturing such an electrode active material layer, thereby providing a battery with improved capacity retention rate. [Solution] The present disclosure provides a method for producing an electrode active material layer, comprising the following steps (a) to (d): (a) Prepare an electrode mixture slurry containing an electrode active material, a sulfide solid electrolyte, and a dispersion medium. (b) Apply the electrode mixture slurry to the substrate. (c) Drying and removing the dispersion medium to form an electrode active material layer, and (d) Densifying the electrode active material layer. The method of the present disclosure involves performing one, two, or three of steps (a) to (d) in a first environment with an oxygen concentration of 1 volume% or more, and performing the other steps (a) to (d) in a second environment with an oxygen concentration of less than 1 volume%. The method of manufacturing a battery of the present disclosure includes manufacturing an electrode active material layer by the method of the present disclosure.

Claims

1. The following steps (a) to (d) are included: (a) Prepare an electrode mixture slurry containing an electrode active material, a sulfide solid electrolyte, and a dispersion medium. (b) Applying the electrode mixture slurry to the substrate, (c) Drying and removing the dispersion medium to form an electrode active material layer, and (d) Densifying the electrode active material layer, One, two, or three of the above steps (a) to (d) are carried out in a first environment with an oxygen concentration of 1 volume percent or more, and The other steps among steps (a) to (d) above are carried out in a second environment where the oxygen concentration is less than 1 volume percent. A method for manufacturing an electrode active material layer.

2. The dew point of the first environment is -65°C or higher, and / or The dew point of the second environment is less than -65°C. The method according to claim 1.

3. The method according to claim 1, wherein one of the steps (a) to (d) is performed in the first environment.

4. The method according to claim 3, wherein step (b) is performed in the first environment.

5. A method for manufacturing a battery, comprising manufacturing an electrode active material layer by the method according to any one of claims 1 to 4.

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