Gel polymer electrolyte and lithium secondary battery containing same

Abstract

The invention discloses a gel polymer electrolyte and a lithium secondary battery containing the same. The present invention relates to a composition for a gel polymer electrolyte containing an electrolyte solvent, lithium salt, a polymerisation initiator and a mixed compound of a first compound and a second compound; and a lithium secondary battery comprising a positive electrode, a negative electrode, a separation membrane and a gel polymer electrolyte. A lithium secondary battery is provided, wherein the gel polymer electrolyte is formed by polymerising the gel polymer electrolyte composition. The gel polymer electrolyte composition of the present invention includes a mixed compound of a first compound and a second compound, wherein the first compound is an amine-based compound including polyethylene glycol as a functional group and the second compound is an epoxy-based compound; and can thereby easily induce a hopping phenomenon when applied to a lithium secondary battery, improve battery life, exhibit excellent storage at high temperatures and improve battery capacity.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2014-0133469 filed with the Korean Intellectual Property Office on October 2, 2014 and Korean Patent Application No. 10-2015-0138643 filed with the Korean Intellectual Property Office on October 1, 2015 the priority and interest of , the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to a gel polymer electrolyte and a secondary battery including the same. Background technique [0004] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources has increased dramatically. Among these secondary batteries, lithium secondary batteries having high energy density and high voltage have been commercialized and widely used. [0005] Lithium metal oxide is used as a positive electrode active material of a lith...

AI Technical Summary

Problems solved by technology

[0008] The gas continuously generated as described above causes the internal pressure of the battery to increase, and causes the center of a specific surface in the battery to deform, such as a square battery that expands in a specific direction, and due to local differences in the adhesion of the electrode surface inside the battery, resulting in The problem that the same electrode reaction cannot occur on the electrode surface

Therefore, it inevitably leads to the degradation of battery performance and safety

[0009] Generally, battery safety increases in the following order: liquid electrolyte < gel polymer electrolyte < solid polymer electrolyte, but battery performance decreases in the same order

Batteries using solid polymer electrolytes have not been commercialized so far due to poor battery performance

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