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

A non-aqueous electrolyte and lithium secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, electrolytes, etc., can solve problems such as difficulty in ensuring the working voltage, achieve the effects of preventing side reactions and improving high-temperature storage characteristics

Pending Publication Date: 2021-11-12
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, since carbonate-based organic solvents are mainly used as electrolyte solution solvents, when batteries are stored at high temperatures for a long time or operated at high voltages, side reactions with electrodes or irreversible capacity due to oxidative decomposition occur, making it difficult to ensure Satisfactory working voltage

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0135] (Preparation of non-aqueous electrolyte solution for lithium secondary battery)

[0136] Mix 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether and fluoroethylene carbonate at a weight ratio of 7:3 and dissolve LiPF6 makes LiPF 6 The concentration was 1.2M, thus preparing a fluorine-containing solvent. 0.1 g of the compound represented by Formula 2a was added to 99.9 g of the fluorine-containing organic solvent to prepare a nonaqueous electrolyte solution for lithium secondary batteries (see Table 1 below).

[0137] (preparation of lithium secondary battery)

[0138] The cathode active material (LiNi 0.6 co 0.2 mn 0.2 o 2 ; NCM), conductive agent (carbon black) and binder (polyvinylidene fluoride) were added to N-methyl-2-pyrrolidone (NMP) in a weight ratio of 97.5:1:1.5 to prepare positive electrode slurry ( Solid content: 50% by weight). A 12 μm thick aluminum (Al) thin film as a positive electrode collector was coated with the positive electrode slurry, ...

Embodiment 2

[0143] A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery comprising the non-aqueous electrolyte solution were prepared in the same manner as in Example 1, except that 1 g of a compound represented by formula 2a was added to 99 g of a fluorine-containing solvent To prepare a non-aqueous electrolyte solution for a lithium secondary battery (see Table 1 below).

Embodiment 3

[0145] A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery comprising the non-aqueous electrolyte solution were prepared in the same manner as in Example 1, except that 3 g of a compound represented by formula 2a was added to 97 g of a fluorine-containing solvent To prepare a non-aqueous electrolyte solution for a lithium secondary battery (see Table 1 below).

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Abstract

The present invention relates to a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery comprising same and, more specifically to: a non-aqueous electrolyte for a lithium secondary battery, the electrolyte comprising a lithium salt, a fluorine-based linear ether solvent, a fluorine-based cyclic carbonate solvent, and a fluorine-based lithium compound, wherein the fluorine-based linear ether solvent and the fluorine-based cyclic carbonate solvent are contained at a weight ratio of 6:4 to 9:1; and a lithium secondary battery comprising same, which thus has improved high temperature storage properties.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0032472 filed on March 21, 2019, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a nonaqueous electrolyte solution for a lithium secondary battery in which side reactions with electrodes are suppressed by securing oxidation stability, and a lithium secondary battery in which high-temperature storage characteristics are improved by containing the nonaqueous electrolyte solution . Background technique [0004] With the development of the information society, the development of personal IT equipment and computer networks, and the consequent increase in the dependence of society as a whole on electric energy, it is necessary to develop technologies that efficiently store and utilize electric energy. [0005] Among the technologies developed for this purpose, the technology bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/052
CPCH01M10/0569H01M2300/0034H01M2300/0037H01M10/0567H01M10/0525Y02E60/10H01M10/052C07F5/04
Inventor 李政旻林永敏李哲行
Owner LG ENERGY SOLUTION LTD
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