Method for producing a carbon nanotube dispersion for electrode slurry, method for producing a negative electrode slurry, and method for producing a non-aqueous electrolyte secondary battery

Abstract

This invention provides a carbon nanotube dispersion for electrode slurries that improves charge-discharge cycle characteristics. [Solution] A method for producing a carbon nanotube dispersion for electrode slurry, according to one aspect of the present disclosure, comprises 0.1 to 1.5 mass% of carbon nanotubes, a dispersion medium, and 100 s of a 3% aqueous solution at 25°C. -1 The process includes a mixing step of preparing a mixture by mixing carboxymethylcellulose having a viscosity of 2 to 200 mPa·s with a dispersion step of dispersing carbon nanotubes contained in the mixture, wherein a high-pressure homogenizer is used in the dispersion step, and the carbon nanotube dispersion for electrode slurry is heated at 25°C for 100 seconds. -1 The viscosity is 50-200 mPa·s, and the particle size distribution of carbon nanotubes in the electrode slurry dispersion, as determined by laser diffraction, is D10 0.3-1.0 μm, D50 3-10 μm, and D90 60 μm or less.

Claims

1. 0.1 to 1.5 mass% of carbon nanotubes, a dispersion medium, and a 3% aqueous solution at 25°C for 100 seconds. －１ A mixing step in which a mixture is prepared by mixing carboxymethylcellulose having a viscosity of 2 to 200 mPa·s with a carboxymethylcellulose, The method includes a dispersion step of dispersing the carbon nanotubes contained in the aforementioned mixture, A method for producing a carbon nanotube dispersion for electrode slurry, wherein a high-pressure homogenizer is used in the dispersion step, The carbon nanotube dispersion for the electrode slurry was heated to 25°C for 100 seconds. －１ The viscosity is 50 to 200 mPa·s. A method for producing a carbon nanotube dispersion for electrode slurry, wherein the particle size distribution of carbon nanotubes in the carbon nanotube dispersion for electrode slurry, as determined by laser diffraction, is such that D10 is 0.3 to 1.0 μm, D50 is 3 to 10 μm, and D90 is 60 μm or less.

2. A method for producing an anode slurry, comprising the step of mixing a carbon nanotube dispersion for electrode slurry prepared by the method for producing a carbon nanotube dispersion for electrode slurry described in claim 1 with a carbon-based anode active material and a Si-based anode active material.

3. A step of preparing a negative electrode using a negative electrode slurry prepared by the negative electrode slurry manufacturing method described in claim 2, The steps include: preparing a non-aqueous electrolyte secondary battery using the aforementioned negative electrode; A method for manufacturing a non-aqueous electrolyte secondary battery.

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