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Electrolyte composition for lithium secondary battery and lithium secondary battery comprising same

A lithium secondary battery and electrolyte technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, electrolytes, etc., can solve problems such as side reactions, reduced wettability of batteries, and reduced overall performance of batteries

Active Publication Date: 2020-05-15
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The injection type method has an advantage in that the wetting of the electrolytic solution is superior to that of the coating type method, but the injection type method has a disadvantage in that the composition for the gel polymer electrolyte is injected before the secondary battery , a side reaction may be caused by the polymerization initiator, or pre-gelation may occur due to a reaction with the polymerization initiator at room temperature
[0013] Therefore, not only is it difficult to perform the liquid injection process, but also the wettability of the battery is reduced when pre-gelation occurs before curing, and therefore, the overall performance of the battery, such as high-temperature stability, may be reduced

Method used

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  • Electrolyte composition for lithium secondary battery and lithium secondary battery comprising same
  • Electrolyte composition for lithium secondary battery and lithium secondary battery comprising same
  • Electrolyte composition for lithium secondary battery and lithium secondary battery comprising same

Examples

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Embodiment 1

[0313] (Preparation of thermosetting electrolyte composition)

[0314] By adding 3 g of a polymer (weight average molecular weight: 95,000, k1: 750, m1: 150, n1: 50) containing the unit represented by formula 1a to 97 g of which 0.5 M LiPF was dissolved 6 And 0.7M LiFSI non-aqueous organic solvent (ethylene carbonate (EC): ethyl methyl carbonate (EMC) = volume ratio 3:7) to prepare a thermosetting electrolyte composition for a lithium secondary battery.

[0315] (Preparation of electrode assembly)

[0316] Li(Ni 0.8 Mn 0.1 Co 0.1 )O 2 (NCM), carbon black as a conductive agent, and polyvinylidene fluoride (PVDF) as a binder are added to N-methyl-2-pyrrolidone as a solvent in a weight ratio of 95:3:2 (NMP) to prepare positive electrode mixture slurry. An aluminum (Al) film with a thickness of about 12 μm as a positive electrode current collector was coated with the positive electrode mixture slurry and dried, and then the coated Al film was rolled to prepare a positive electrode.

[03...

Embodiment 2

[0322] A thermosetting electrolyte composition for a lithium secondary battery and a lithium secondary battery including a gel polymer electrolyte prepared therefrom were prepared in the same manner as in Example 1, except that, during the preparation of the thermosetting electrolyte composition, 5g of polymer containing the unit represented by formula 1a was added to 95g of which 0.5M LiPF was dissolved 6 And 0.7M LiFSI non-aqueous organic solvent (ethylene carbonate (EC): ethyl methyl carbonate (EMC) = volume ratio 3:7).

Embodiment 3

[0324] A thermosetting electrolyte composition for a lithium secondary battery and a lithium secondary battery including a gel polymer electrolyte prepared therefrom were prepared in the same manner as in Example 1, except that, during the preparation of the thermosetting electrolyte composition, 10g of polymer containing the unit represented by formula 1a was added to 90g of which 0.5M LiPF was dissolved 6 And 0.7M LiFSI non-aqueous organic solvent (ethylene carbonate (EC): ethyl methyl carbonate (EMC) = volume ratio 3:7).

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Abstract

The present invention relates to a thermosetting electrolyte composition for a lithium secondary battery, and the lithium secondary battery comprising the same. More particularly, the present invention relates to the thermosetting electrolyte composition comprising LiPF6 as a first lithium salt, a non-aqueous organic solvent, and a polymer or oligomer comprising a unit represented by formula 1 forthe lithium secondary battery, and the lithium secondary battery comprising the same, wherein the polymer or oligomer comprising the unit represented by formula 1 is contained in an amount of 0.6 to15% by weight on the basis of the total weight of the thermosetting electrolyte composition for the lithium secondary battery.

Description

Technical field [0001] Cross references to related applications [0002] This application claims the rights of Korean Patent Application No. 2017-0164113 filed at the Korean Intellectual Property Office on December 1, 2017 and Korean Patent Application No. 2018-0151896 filed at the Korean Intellectual Property Office on November 30, 2018 The disclosure of the aforementioned patent application is incorporated herein as a whole by reference. Technical field [0003] The present invention relates to an electrolyte composition for a lithium secondary battery and a lithium secondary battery including the electrolyte composition. Background technique [0004] Recently, with the rapid development of electrical, electronic, communication, and computer industries, the demand for high-performance, high-stability secondary batteries has been increasing. In particular, with the trend toward miniaturization and weight reduction of electronic (communication) devices, thin films and small lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052H01M4/525H01M4/505C08L29/10C08L33/14C08L29/04C08L35/02
CPCC08L33/14C08L35/02H01M10/0565C08F216/1458C09D129/10Y02E60/10H01M10/0525H01M2300/0085C08F218/10C08F220/08C08F218/12C08F216/06C08K3/32H01M10/052H01M4/525H01M4/505C08L29/10C08L29/04C08F218/08C08F220/36C08J3/075C08J2329/04C08J2329/10C08J2331/04C08J2333/14C08K2003/324H01M10/0567H01M10/0568H01M2300/0025H01M2300/0082H01M2300/0091
Inventor 李在原安庆昊李哲行李正勳申元景
Owner LG ENERGY SOLUTION LTD