Composition for gel polymer electrolyte and gel polymer electrolyte

A technology of gel polymer and electrolyte, which is applied in the direction of electrolyte immobilization/gelation, composite electrolyte, non-aqueous electrolyte battery, etc., and can solve the problems of low lithium ion conductivity and reduced mechanical strength

Active Publication Date: 2021-04-02
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the disadvantage of gel polymer electrolytes is that their Li-ion conductivity is lower than that of liquid electrolytes formed only from electrolytes.
To solve this problem, a method of reducing the thickness of the gel polymer electrolyte has been proposed, but in this case, since the mechanical strength is reduced, and the gel polymer electrolyte is short-circuited during battery generation, the There are problems with the performance and safety of secondary batteries

Method used

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  • Composition for gel polymer electrolyte and gel polymer electrolyte
  • Composition for gel polymer electrolyte and gel polymer electrolyte
  • Composition for gel polymer electrolyte and gel polymer electrolyte

Examples

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Embodiment approach

[0194] Hereinafter, the present invention will be described in detail by way of specific examples. However, the descriptions set forth herein are only preferred embodiments for illustrative purposes and are not intended to limit the scope of the present invention, so it should be understood that these embodiments are provided for the purpose of clearer explanation to those of ordinary skill in the art.

Embodiment 1

[0198] 1M LiPF 6 Dissolved in a nonaqueous electrolyte solvent having a composition of ethylene carbonate (EC): ethylmethyl carbonate (EMC): dimethyl carbonate (DMC) in a volume ratio of 2:3:5 to prepare 98.7 g of nonaqueous electrolyte. With 0.3g polymer A (o 1 :p 1 The molar ratio is 50:50, the weight average molecular weight (Mw) is 50,000) and 1 g of polymer B represented by formula 2a (q 1 :p 1 :r 1 is 45:45:10, and the weight average molecular weight (Mw) is 50,000) is added in this non-aqueous electrolyte, thus prepares the composition for gel polymer electrolyte (the weight ratio of polymer A: polymer B is 0.3:1).

[0199] A gel polymer electrolyte was prepared by subjecting the composition for a gel polymer electrolyte to a polymerization reaction at 65° C. using a thermal curing method.

Embodiment 2

[0201] The composition for gel polymer electrolyte of the present invention (the weight ratio of polymer A: polymer B is 0.5:2) is prepared in the same manner as in Example 1, except that 0.5 g is obtained by formula 1a Polymer A represented and 2.0 g of polymer B represented by Formula 2a were added to 97.5 g of the nonaqueous electrolyte.

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Abstract

The present invention relates to a composition for gel polymer electrolyte and a gel polymer electrolyte prepared by using the composition, and specifically provides a composition for gel polymer electrolyte, including: lithium salt, Organic solvent, and the polymer A with epoxy group represented by formula 1, and the polymer B with amino group and cyano group represented by formula 2, wherein the amount of polymer A and polymer B is based on the The composition of the polymer electrolyte is 1% by weight to 20% by weight of the total weight, and a gel polymer electrolyte for a secondary battery can be prepared, which includes the polymer A having an epoxy group represented by Formula 1 A polymer network formed by combining with a polymer B represented by Formula 2 having an amino group and a cyano group in a three-dimensional structure.

Description

technical field [0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority and benefit from Korean Patent Application No. 10-2016-0038575 filed on March 30, 2016, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a composition for gel polymer electrolyte and gel polymer electrolyte prepared by polymerizing the composition. Background technique [0004] With the development of technology and increase in demand for mobile devices, the demand for secondary batteries as energy sources has been rapidly increasing. Among these secondary batteries, lithium secondary batteries having high energy density and voltage have been commercialized and widely used. [0005] Generally, a lithium secondary battery can be prepared using a positive electrode and a negative electrode including an electrode active material that can intercalate and deintercalate lithium ions, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/052H01M10/0525
CPCC08G61/10C08G2261/312C08G2261/51C08L2203/20C09D133/068H01M10/052H01M10/0565H01M10/0568H01M10/4235H01M2300/0068H01M2300/0085H01M2300/0088Y02E60/10C08G61/025C08G2261/12C08G2261/1426C08G2261/143C08G2261/149C08G2261/90C08L33/12C08L33/14C08L33/20C08L75/04H01M2300/0091H01M10/0525H01M10/056H01M2300/0082
Inventor 安庆昊李正勳李哲行吴正友郑理珍朴卛智
Owner LG ENERGY SOLUTION LTD
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