Gel polymer electrolyte and lithium secondary battery containing same

一种凝胶聚合物、锂二次电池的技术，应用在非水电解质蓄电池、二次电池、锂蓄电池等方向，能够解决电极表面不能发生电极反应、电池性能降低、差电池性能等问题，达到优异高温可存储性、增强电池寿命、增强电池容量性能的效果

Active Publication Date: 2017-05-31
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Gel polymer electrolyte and lithium secondary battery containing same
  • Gel polymer electrolyte and lithium secondary battery containing same
  • Gel polymer electrolyte and lithium secondary battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Embodiment 1: Preparation of the composition for gel polymer electrolyte

[0075] By adding LiPF 6 The liquid electrolyte was prepared by dissolving in a non-aqueous liquid electrolyte solvent having a composition of ethylene carbonate (EC):ethyl methyl carbonate (EMC)=1:2 (volume ratio) so that the concentration was 1M. 0.25% by weight of tert-butyl peroxy-2-ethylhexanoate as a polymerization initiator, and 2% by weight of poly(ethyleneimine)-glucose based on the total weight of the composition for electrolytes having the liquid electrolyte weight Branch-poly(ethylene glycol) (PEI-PEG) as the first compound and 1 / 3% by weight polyethylene glycol diglycidyl ether relative to the first compound were added to the liquid electrolyte as the second compound to prepare a gel Composition for gel polymer electrolyte.

Embodiment 2

[0076] Embodiment 2: Preparation of the composition for gel polymer electrolyte

[0077] A composition for a gel polymer electrolyte was prepared in the same manner as in Example 1, except that poly(ethyleneimine)-graft-poly(ethylene glycol) (PEI-PEG) was used in an amount of 5% by weight as the second One compound and polyethylene glycol diglycidyl ether was used as the second compound in an amount of 1 / 3% by weight relative to the first compound.

Embodiment 3

[0078] Embodiment 3: Preparation of the composition for gel polymer electrolyte

[0079] A composition for gel polymer electrolyte was prepared in the same manner as in Example 1, except that poly(ethyleneimine) (PEI) was used instead of poly(ethyleneimine)-graft-poly(ethylene glycol) (PEI-PEG) as the first compound.

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/052Y02E60/10C08G73/024C08G2220/00H01M4/525H01M4/587H01M2300/0085
Inventor 朴卛智安庆昊吴正友李哲行郑理珍
Owner LG ENERGY SOLUTION LTD
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