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

A lithium secondary battery, gel polymer technology, applied in the direction of electrolyte immobilization/gelation, electrolyte battery manufacturing, non-aqueous electrolyte battery, etc. problem, to achieve the effect of preventing pre-gelation

Active Publication Date: 2020-12-11
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of liquid electrolytes are: low stability, for example, not only the possibility of organic solvent volatilization is high, but also due to decomposition of carbonate organic solvent and / or side reactions between organic solvent and electrodes during charge and discharge Gas generation in the battery causes the thickness of the battery to also increase
[0011] Regarding the injection type method, the wettability (wetting) of the electrolyte solution to the electrode is improved compared with the coating type method, but the injection type method has a disadvantage in that since the composition for the gel polymer electrolyte is injected into the Before entering the secondary battery, it reacts with a polymerization initiator at room temperature to cause pre-gelation (pre-gel)
Therefore, since the wettability of the battery is lowered when pregelation occurs before curing, not only the overall performance of the battery will be lowered, but also the liquid injection process may not be easily performed. In addition, the interfacial resistance between the electrode and the separator may increase, resulting in degraded cycle performance

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0181] (Preparation of Thermosetting Electrolyte Composition)

[0182] LiPF 6 and LiFSi(LiN(SO 2 f) 2 ) was dissolved in 94g of non-aqueous organic solvent in which ethylene carbonate (EC) and dimethyl carbonate (DMC) were mixed in a volume ratio of 15:85, so that LiPF 6 and LiFSi each at a concentration of 1.0 M, and then by adding 5.0 g of a compound represented by formula 1a (k: 30 mol, m: 1 mol, n: 69 mol, weight average molecular weight (Mw): 51,000) and 1.0 g of subcarbonate as an additive Vinyl ester (VC) to prepare thermosetting electrolyte composition.

[0183] (Preparation of Electrode Assembly)

[0184] The positive electrode active material (Li(Ni 0.8 mn 0.1 co 0.1 )O 2 ), a conductive agent (carbon black) and a binder (polyvinylidene fluoride: PVDF) were added to N-methyl-2-pyrrolidone (NMP) as a solvent in a weight ratio of 94:3:3 to prepare Positive electrode active material slurry (solid content: 48% by weight). A 100 μm thick positive electrode curre...

Embodiment 2

[0190] A lithium secondary battery comprising a gel polymer electrolyte was prepared in the same manner as in Example 1, except that LiPF 6 and LiFSi(LiN(SO 2 F) 2 ) is dissolved in 94g of non-aqueous organic solvent, making LiPF 6 and LiFSi each at a concentration of 1.0 M, and then by adding 5.0 g of a compound represented by formula 1a (k: 30 mol, m: 15 mol, n: 55 mol, weight average molecular weight (Mw): 45,000) and 1.0 g of subcarbonate as an additive Vinyl ester (VC) to prepare thermosetting electrolyte composition.

Embodiment 3

[0192] A lithium secondary battery comprising a gel polymer electrolyte was prepared in the same manner as in Example 1, except that LiPF 6 and LiFSi(LiN(SO 2 F) 2 ) is dissolved in 94g of non-aqueous organic solvent, making LiPF 6 and LiFSi at a concentration of 1.0M, and then by adding 5.0 g of the compound represented by formula 1a (k: 10 mol, m: 10 mol, n: 80 mol, weight average molecular weight (Mw): 62,000) and 1.0 g of subcarbonate as an additive Vinyl ester (VC) to prepare thermosetting electrolyte composition.

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Abstract

The present invention relates to a thermosetting electrolyte composition for a lithium secondary battery, a gel polymer electrolyte prepared therefrom, and a lithium secondary battery comprising sameand, specifically, to: a thermosetting electrolyte composition for a lithium secondary battery, comprising LiPF6, which is a first lithium salt, a second lithium salt excluding LiPF6, a nonaqueous organic solvent, and a polymer or an oligomer comprising a unit represented by chemical formula 1; a gel polymer electrolyte prepared therefrom; and a lithium secondary battery comprising same.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 2018-0107916 filed with the Korean Intellectual Property Office on September 10, 2018, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a thermosetting electrolyte composition for a lithium secondary battery, a gel polymer electrolyte prepared from the thermosetting electrolyte composition, and a lithium secondary battery including the gel polymer electrolyte, and more particularly, to A thermosetting electrolyte composition for a lithium secondary battery including a polymer or oligomer having a thermally polymerizable functional group, a gel polymer electrolyte prepared from the thermosetting electrolyte composition, and a gel polymer electrolyte comprising the gel polymer electrolyte lithium secondary battery. Background technique [0004] Rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/052
CPCH01M10/0565Y02E60/10H01M10/0568H01M10/0567H01M10/0525H01M2300/0082H01M2300/0085H01M10/4235Y02P70/50H01M10/058H01M10/052H01M2300/0025
Inventor 安庆昊李正勳申元景李在原朴卛智李哲行
Owner LG ENERGY SOLUTION LTD