SLURRY COMPOSITION FOR NEGATIVE ELECTRODE FOR LITHIUM-ION SECONDARY BATTERY, NEGATIVE ELECTRODE FOR LITHIUM-ION SECONDARY BATTERY, AND LITHIUM-ION SECONDARY BATTERY

摘要

A slurry composition includes a negative electrode active material, a particulate binder, a water soluble polymer, and water. The particulate binder includes a first particulate binder and a second particulate binder. The first particulate binder includes a copolymer (A) including an aliphatic conjugated diene monomer unit and an aromatic vinyl monomer unit, has a degree of swelling in electrolysis solution of 110% to 200% by mass, has a glass transition temperature of −30° C. to 60° C., and has a gel content of 70% to 98% by mass. The second particulate binder includes a copolymer (B) including an aliphatic conjugated diene monomer unit and an aromatic vinyl monomer unit, has a degree of swelling in electrolysis solution of 250% to 600% by mass, and has a gel content of 70% to 98% by mass.

主权项

1. A slurry composition for a negative electrode for a lithium ion secondary battery, the slurry composition comprising:
a negative electrode active material, a particulate binder, a water soluble polymer, and water, wherein the particulate binder comprises a first particulate binder and a second particulate binder, the first particulate binder comprises a copolymer (A) including an aliphatic conjugated diene monomer unit and an aromatic vinyl monomer unit, has a degree of swelling in electrolysis solution of 110% by mass or more to 200% by mass or less, has a glass transition temperature of −30° C. or higher to 60° C. or lower, and has a gel content of 70% by mass or more to 98% by mass or less, and the second particulate binder comprises a copolymer (B) including an aliphatic conjugated diene monomer unit and an aromatic vinyl monomer unit, has a degree of swelling in electrolysis solution of 250% by mass or more to 600% by mass or less, and has a gel content of 70% by mass or more to 98% by mass or less.