METHOD FOR PRODUCING SLURRY FOR HEAT-RESISTANT LAYER FOR LITHIUM ION SECONDARY BATTERY AND METHOD FOR PRODUCING ELECTRODE FOR LITHIUM ION SECONDARY BATTERY

摘要

A method for producing a slurry for a heat-resistant layer for a lithium ion secondary battery, including: a step of producing a polymer aqueous dispersion by polymerizing a monomer in an aqueous medium to give a polymer aqueous dispersion containing a polymer with a polymerization conversion rate of 90 to 100%, a step of obtaining a mixed solution by mixing N-methylpyrrolidone and the polymer aqueous dispersion, a step of obtaining a binder composition by removing an unreacted monomer and the aqueous medium from the mixed solution in a substitution tank, and a step of obtaining a slurry by dispersing non-conductive microparticles in the binder composition, wherein the step of obtaining the binder composition includes removing the aqueous medium and the unreacted monomer, while feeding the mixed solution to an external heating device and feeding a heat quantity to: the mixed solution that has been fed to the external heating device.

主权项

1. A method for producing a slurry for a heat-resistant layer for a lithium ion secondary battery, comprising:
a step of producing a polymer aqueous dispersion by polymerizing a monomer in an aqueous medium to give a polymer aqueous dispersion containing a polymer with a polymerization conversion rate of 90 to 100%, a step of obtaining a mixed solution by mixing N-methylpyrrolidone and the polymer aqueous dispersion, a step of obtaining a binder composition by removing an unreacted monomer and the aqueous medium from the mixed solution in a substitution tank, and a step of obtaining a slurry by dispersing non-conductive microparticles in the binder composition, wherein the step of obtaining the binder composition comprises removing the aqueous medium and the unreacted monomer under a reduced pressure so that the binder composition contains the unreacted monomer in an amount of 300 ppm or less and a water content in an amount of 5,000 ppm or less, while feeding the mixed solution to an external heating device that is disposed outside of the substitution tank and feeding a heat quantity to the mixed solution that has been fed to the external heating device.