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

A technology of gel polymer and electrolyte, which is applied in the direction of non-aqueous electrolyte storage battery, electrolyte immobilization/gelation, secondary battery, etc. It can solve the problems of low and high temperature safety, heat release of lithium secondary battery, etc., and achieve improvement The effect of high temperature safety

Active Publication Date: 2020-04-21
LG ENERGY SOLUTION LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

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Embodiment 1

[0236] (1) Preparation of composition for gel polymer electrolyte

[0237] By mixing ethylene carbonate (EC) and ethyl methyl carbonate (EMC) at a volume ratio of 3:7, and adding 0.7M LiPF 6 and 0.5M LiFSI to prepare a mixed solvent, then add 5 g of oligomers (weight average molecular weight is 4,000) represented by formula 1-5 in the prepared mixed solvent of 76.98 g, as additives 10 g represented by formula 2-1 The compound, 0.02g polymerization initiator (AIBN), and as other additives 1.5g VC, 0.5g PS, and 1g ESa, to prepare the composition for gel polymer electrolyte:.

[0238] (2) Manufacture of lithium secondary batteries

[0239] 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% by weight of carbon black (carbon black) as a conductive agent, and 1% by weight of PVDF as a binder to prepare a positive electrode mixture slurry. An aluminum (Al) thin film having a th...

Embodiment 2

[0243] A lithium secondary battery including a gel polymer electrolyte was produced in the same manner as in Example 1, except that, unlike Example 1, 10 g of the compound represented by Formula 3-1 was added instead of 10 g of the compound represented by Formula 2- The compound represented by 1 was used as an additive.

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Abstract

The present invention provides a composition for gel polymer electrolytes, a gel polymer electrolyte prepared by using the same, and a lithium secondary battery, the composition for gel polymer electrolytes comprising: an oligomer represented by chemical formula 1; an additive; a polymerization initiator; a lithium salt; and a non-aqueous solvent, wherein the additive comprises at least one compound selected from the group consisting of a substituted or unsubstituted phosphoric acid-based compound and a substituted or unsubstituted benzene-based compound.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2017-0163716 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 safe 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
CPCH01M10/0565H01M10/0567H01M2300/0085H01M10/0525Y02E60/10Y02P70/50H01M10/052C08G69/02C08K5/524H01M2004/027H01M2004/028H01M2300/0065
Inventor 李正勳安庆昊李哲行吴正友
Owner LG ENERGY SOLUTION LTD
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