Gelling agent for batteries

摘要

The present invention has its objective to provide a gelling agent for a battery, which forms a paste gel in a short period of time on dissolution in an alkaline electrolyte. The gel has less bubbles and a high gel density. The gelling agent for a battery comprises granular carboxyl group-containing polymer particles having a median particle diameter of 100 to 800 μm and a bulk density of 0.30 g/ml or more, and has a gel turbidity of 200 ppm or less and a gel density of 1.37 g/ml or more in a gel. The gel is prepared by adding 2 parts by mass of the granular carboxyl group-containing polymer particles to 98 parts by mass of 40% by mass of an aqueous potassium hydroxide solution.