ADDITIVE FOR ELECTROCHEMICAL ELEMENT, BINDER COMPOSITION FOR ELECTROCHEMICAL ELEMENT, SLURRY COMPOSITION FOR ELECTROCHEMICAL ELEMENT, ELECTRODE FOR ELECTROCHEMICAL ELEMENT, AND ELECTROCHEMICAL ELEMENT

摘要

Provided is an additive for an electrochemical element, the additive being capable of ensuring a high degree of safety in an electrochemical element. An additive for an electrochemical element, the additive being used in an electochemical element, wherein: the temperature at which the volume expansion rate is increased by a factor of 2 or more is greater than 150°C and less than 400°C; the contained amount of (A) elements belonging to group 2 of the periodic table is less than 100 mass ppm; the contained amount of (B) elements belonging to group 17 of the periodic table is less than 100 mass ppm; and the contained amount of (C) the elements Cr, Mn, Fe, Co, Ni, Cu, and Zn is less than 5 mass ppm.