Electrode paste production method
Provided is an electrode paste production method that can produce a low-viscosity electrode paste which can be readily applied even if the solid content concentration is high, for example in excess of 65% by mass. The electrode paste production method, in which the paste contains an active material and a solvent, includes a micromixing treatment step in which a mixture of a solid fraction containing an active material blended at a high solid content concentration and a solvent is kneaded using a micromixer.
1. A production method for an electrode paste comprising an active material and a solvent,
the production method comprising a micromixing treatment step in which a mixture of a solid fraction containing the active material blended at a high solid content concentration and the solvent is kneaded using a micromixer, wherein
the solid content concentration of the mixture exceeds 65% by mass, and
the micromixer is a kneading device that feeds a slurry into a nozzle portion by a pump, and that performs kneading with a shear energy from not less than 4,000 kJ/L to not more than 16,000 kJ/L which is generated as the slurry passes through the nozzle portion, wherein a diameter of the nozzle portion for the kneading is at a microscale level from 30 μm to 100 μm.
2. The production method for an electrode paste according to claim 1 , wherein the production method further comprises a coating treatment step of coating the active material with an additive prior to the micromixing treatment step.
3. The production method for an electrode paste according to claim 1 , wherein an additive is added and kneaded in the micromixing treatment step.
4. The production method for an electrode paste according to claim 1 , wherein
the active material comprises a lithium-nickel-manganese complex oxide, and
the electrode paste also comprises a substance having lithium ion conductivity as an additive.