Composition for gel polymer electrolyte, gel polymer electrolyte prepared by means of same, and lithium secondary battery comprising same

A technology of gel polymer and composition, applied in non-aqueous electrolyte storage battery, electrolyte immobilization/gelation, secondary battery, etc. The effect of improving high temperature safety

Active Publication Date: 2020-04-21
LG ENERGY SOLUTION LTD
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  • Summary
  • 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 at high voltage, heat release may often occur in lithium secondary batteries as the internal temperature rises
Therefore, there is a problem that liquid electrolytes composed only of organic solvents and salts generally have low high-temperature safety, and once a fire starts, combustion proceeds spontaneously even if the external current supply is cut off

Method used

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  • Composition for gel polymer electrolyte, gel polymer electrolyte prepared by means of same, and lithium secondary battery comprising same
  • Composition for gel polymer electrolyte, gel polymer electrolyte prepared by means of same, and lithium secondary battery comprising same
  • Composition for gel polymer electrolyte, gel polymer electrolyte prepared by means of same, and lithium secondary battery comprising same

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specific Embodiment approach

[0245] Hereinafter, the present invention will be described in more detail through specific examples. However, the following examples are only for helping the understanding of the present invention, and should not be construed as limiting the scope of the present invention. It is obvious to those skilled in the art that various changes and modifications can be made within the scope of the specification and technical spirit, and they are of course included in the scope of the appended claims.

Embodiment 1

[0248] (1) Preparation of composition for gel polymer electrolyte

[0249] By mixing ethylene carbonate (EC) and ethyl methyl carbonate (EMC) at a volume ratio of 3:7 and adding 0.7MLiPF 6 and 0.5M LiFSI to prepare a mixed solvent, then add 2.5 g of oligomers represented by formula 1-5 (weight average molecular weight is 5,000), 2.5 g of oligomers represented by formula 2-1 in 100 g of prepared mixed solvents (weight-average molecular weight: 3,000), 0.02 g of a polymerization initiator (AIBN), and 1.5 g of VC, 0.5 g of PS, and 1 g of ESa as other additives to prepare a composition for a gel polymer electrolyte.

[0250] (2) Manufacture of lithium secondary batteries

[0251] By adding 97.5% by weight of (LiNi 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 thickness of about 20 μm as a cathode curren...

Embodiment 2

[0255] A lithium secondary battery including a gel polymer electrolyte was manufactured in the same manner as in Example 1 except that, unlike in Example 1, 2 g of the compound represented by Formula 2-1 was added.

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Abstract

The present invention provides a composition for gel polymer electrolyte, gel polymer electrolyte prepared by means of same, and a lithium secondary battery, the composition comprising: a first oligomer represented by chemical formula (1); a second oligomer comprising a first repeating unit represented by chemical formula (2a) and derived from a styrene monomer; a polymerization initiator; lithiumsalts; 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. 10-2017-0163677 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 comprising the gel polymer electrolyte, and more particularly, to a battery having improved high temperature stability A composition for a gel polymer electrolyte, a gel polymer electrolyte prepared from the composition, and a lithium secondary battery comprising the gel polymer electrolyte. Background technique [0004] With the technological development of mobile devices and the increase in demand for mobile devices, the demand for secondary batteries as energy sources has remarka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/0565H01M10/0525H01M2300/0085Y02E60/10Y02P70/50H01M10/052C08L25/12C08L83/06
Inventor 吴正友安庆昊李哲行李正勳
Owner LG ENERGY SOLUTION LTD
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