SLURRY COMPOSITION FOR NEGATIVE ELECTRODES OF LITHIUM ION SECONDARY BATTERIES, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY

摘要

The purpose of the present invention is to provide a slurry composition for negative electrodes of lithium ion secondary batteries, which has excellent coatability and is capable of increasing battery capacity, while suppressing expansion and shrinkage of a silicon-based negative electrode active material, said expansion and shrinkage accompanying charge and discharge of a battery. A slurry composition for negative electrodes of lithium ion secondary batteries according to the present invention contains a negative electrode active material, a polyacrylic acid and water. The negative electrode active material contains a silicon-based negative electrode active material in an amount of 5-40% by mass. The ratio of the viscosity of a 1% by mass aqueous solution of the polyacrylic acid to the viscosity of a 0.5% by mass aqueous solution of the polyacrylic acid is 2.0 or more.