Composition for gel polymer electrolyte, gel polymer electrolyte prepared therefrom, and lithium secondary battery comprising same

A technology of gel polymer and composition, which is applied in non-aqueous electrolyte batteries, electrolyte immobilization/gelation, secondary batteries, etc. It can solve the problems of low-temperature safety, heat release of lithium secondary batteries, etc., and achieve Effect of improving high temperature safety

Active Publication Date: 2020-04-17
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, when the secondary battery is driven at high temperature and high voltage, heat release may frequently occur in lithium secondary batteries as the internal temperature rises
Therefore, there is a problem that liquid electrolytes consisting only of organic solvents and salts generally have low high-temperature safety, and once a fire starts, combustion proceeds spontaneously even if the external supply current is cut off

Method used

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  • Composition for gel polymer electrolyte, gel polymer electrolyte prepared therefrom, and lithium secondary battery comprising same
  • Composition for gel polymer electrolyte, gel polymer electrolyte prepared therefrom, and lithium secondary battery comprising same
  • Composition for gel polymer electrolyte, gel polymer electrolyte prepared therefrom, and lithium secondary battery comprising same

Examples

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Effect test

Embodiment 1

[0239] (1) Preparation of composition for gel polymer electrolyte

[0240] The composition for the gel polymer electrolyte was prepared by mixing ethylene carbonate (EC) and ethylmethyl carbonate (EMC) at a volume ratio of 3:7, adding 0.7M LiPF 6 and 0.5M LiFSI to prepare mixed solvent, then add 4g of oligomer (weight average molecular weight is 4000) represented by formula 1-5, 1g of oligomer represented by formula 2-1 in 91.98g of prepared mixed solvent (weight-average molecular weight of 3000), 0.02 g of 2,2'-azobis (isobutyronitrile) (2,2'-Azobis (iso-butyronitrile, AIBN) as a polymerization initiator, and as other additives 1.5g of vinylene carbonate (Vinylene Carbonate, VC), 0.5g of propane sultone (PS) and 1g of vinyl sulfate (Ethylene sulfate, ESa).

[0241] (2) Manufacture of lithium secondary batteries

[0242] By adding 97.5% by weight of LiNi as a positive electrode active material to N-methyl-2-pyrrolidone (NMP) as a solvent 0.8 co 0.1 mn 0.1 o 2 (NCM), 1.5%...

Embodiment 2

[0246] A lithium secondary battery including a gel polymer electrolyte was fabricated in the same manner as in Example 1 except that, unlike Example 1, 2 g of the compound represented by Formula 2-1 was added.

Embodiment 3

[0248] A lithium secondary battery including a gel polymer electrolyte was fabricated in the same manner as in Example 1, except that, unlike Example 1, 1 g of the oligomer represented by formula 2-2 was added instead of 1 g of the oligomer represented by formula The oligomer represented by 2-1 was used as the second oligomer.

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Abstract

The present invention provides a composition for a gel polymer electrolyte, and a gel polymer electrolyte and a lithium secondary battery produced by using the same, the composition comprising: a first oligomer represented by formula 1; a second oligomer comprising a first repeating unit represented by formula 2a derived from a styrene monomer; a polymerization initiator; a lithium salt; and a non-aqueous solvent.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2017-0163676 filed in the Korean Intellectual Property Office on November 30, 2017, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a composition for a gel polymer electrolyte, a gel polymer electrolyte prepared from the composition, and a lithium secondary battery including the gel polymer electrolyte, and more particularly, to a battery having improved high temperature A stable composition for a gel polymer electrolyte, a gel polymer electrolyte prepared from the composition, and a lithium secondary battery including the gel polymer electrolyte. Background technique [0004] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources has remarkably increased, and among th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/0565H01M10/0525H01M2300/0091Y02E60/10Y02P70/50H01M10/052H01M2300/0085C08L25/08C08L33/08C08L33/24H01M2300/0082
Inventor 李正勳安庆昊吴正友李哲行
Owner LG ENERGY SOLUTION LTD
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