Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery comprising same

A non-aqueous electrolyte, lithium secondary battery technology, applied in non-aqueous electrolyte batteries, secondary batteries, electrolytes, etc., can solve the problems of high-temperature storage characteristics degradation of secondary batteries, inability to be effectively charged, etc., to improve high-temperature storage. Characteristics and capacity characteristics, reduction of battery swelling, effect of suppressing gas generation

Pending Publication Date: 2022-06-07
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] With currently used non-aqueous electrolyte solutions, battery swelling occurs due to gas generation during rapid charging at a rate above 2C, or because it cannot be efficiently charged, the high-temperature storage characteristics of the secondary battery deteriorate while lithium is precipitated from the negative electrode

Method used

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  • Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery comprising same
  • Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery comprising same

Examples

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Effect test

Embodiment 1

[0127] (Preparation of non-aqueous electrolyte solution)

[0128] Ethylene carbonate and ethyl propionate are mixed in a volume ratio of 1:9 and then LiPF is dissolved 6 Make LiPF 6 the concentration is 1.6 M, from which an electrolyte solution (A-1) is prepared. 1 g of 1,4-dicyanobutene and 2 g of vinylene carbonate were added as additives to 97 g of electrolyte solution (A-1) to prepare a non-aqueous electrolyte solution (B-1).

[0129] (Preparation of electrode assembly)

[0130] The positive electrode active material (LiCoO 2), conductive agents (carbon black) and adhesives (polyvinylidene fluoride; PVDF) was added as a solvent in n-methyl-2-pyrrolidinone (NMP) as a solvent in a 94:3:3 weight ratio to prepare a cathode slurry. A film of approximately 20 μm thick aluminum (Al) that is used as a cathode collector is coated with a cathode slurry, dried, and then rolled to prepare the positive electrode.

[0131] The negative electrode active material (graphite), conductive agent ...

Embodiment 2

[0136] 3g of 1,4-dicyanobutene and 2g of vinylene carbonate were added to 95g of electrolyte solution (A-1) to prepare a non-aqueous electrolyte solution of the present invention (B-2).

[0137] Subsequently, a pouch type lithium secondary battery is prepared in the same manner as Example 1, the difference is that a non-aqueous electrolyte solution (B-2) is injected instead of a non-aqueous electrolyte solution of Example 1 (B-1).

Embodiment 3

[0139] 0.5g of 1,4-dicyanobutene and 2g of vinylene carbonate were added to 97.5g of electrolyte solution (A-1) to prepare a non-aqueous electrolyte solution of the present invention (B-3).

[0140]Subsequently, a pouch type lithium secondary battery is prepared in the same manner as Example 1, the difference is that a non-aqueous electrolyte solution (B-3) is injected instead of a non-aqueous electrolyte solution (B-1) of Example 1.

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Abstract

The present invention relates to a non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery comprising the same, and more specifically, to a non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery comprising the same, the non-aqueous electrolyte solution comprising 1.5 M to 2.0 M of a lithium salt; an organic solvent containing ethylene carbonate and ethyl propionate; and a nitrile-based compound represented by Formula 1, wherein the volume ratio of ethylene carbonate and ethyl propionate contained in the nitrile-based compound is 1: 9 to 1.5: 8.5.

Description

[0001] Cross-references to relevant applications [0002] This application claims priority in Korean Patent Application No. 10-2020-0021730 filed on February 21, 2020 and Korean Patent Application No. 10-2021-0020837 filed on February 17, 2021, the disclosure of which is incorporated herein by reference. Technical field [0003] The present invention relates to a lithium secondary battery with a non-aqueous electrolyte solution and a lithium secondary battery comprising thereof, and relates to a lithium secondary battery may inhibit the gas generated during high voltage operation of a non-aqueous electrolyte solution, and by comprising the non-aqueous electrolyte solution to improve the high temperature storage characteristics of the lithium secondary battery. Background [0004] With the increase in technological development and demand for mobile devices, the demand for secondary batteries as energy sources has increased significantly, and in these secondary batteries, lithium se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M2300/0037Y02E60/10Y02P70/50H01M10/4235H01M50/46
Inventor 李政旻林永敏李哲行郑理珍廉澈殷
Owner LG ENERGY SOLUTION LTD
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