ELECTROLYTE COMPOSITION WITH EXCELLENT HIGH-TEMPERATURE STABILITY AND PERFORMANCE AND ELECTROCHEMICAL ELEMENT INCLUDING SAME

摘要

An electrolyte composition according to the present invention includes: (i) a solvent; (ii) a lithium sa and (iii) 0.1 to 5% by weight of a pullulan series polymeric resin based on the total weight of the electrolyte composition, characterized in that the pullulan series polymeric resin is a polymer, oligomer or a mixture thereof containing at least one repeat unit represented by formula 1. The electrolyte composition according to the present invention has excellent durability at room temperature or higher temperature, and prevents generation of a gas due to the breakdown of the electrolyte at high temperature so as to improve the stability of an electrochemical element, thus effectively applied to manufacture the electrochemical element.