Electrolyte for chargeable lithium cell and chargeable lithium cell containing the same

A technology of rechargeable lithium battery and electrolyte, applied in the field of electrolyte of rechargeable lithium battery and rechargeable lithium battery containing it, can solve problems such as not being very compatible

Inactive Publication Date: 2009-02-04
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic fluoroethers have a high fluorine content, which leads to increased stability during decomposition, but they are not very compatible with other organic solvents used in electrolytes

Method used

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  • Electrolyte for chargeable lithium cell and chargeable lithium cell containing the same
  • Electrolyte for chargeable lithium cell and chargeable lithium cell containing the same
  • Electrolyte for chargeable lithium cell and chargeable lithium cell containing the same

Examples

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Embodiment 1-18 and comparative example 1-14

[0068] According to the composition shown in table 2 and table 3, prepare the electrolytic solution of embodiment 1-18 and comparative example 1-14, use fluorine-substituted ether compound and non-aqueous organic solvent as electrolytic solution solvent; Use LiPF 6 , BETI (manufactured by 3M) or a mixture thereof as the electrolyte salt; and using an optional compatibilizer. In Table 2 and Table 3, the electrolytic solution of Example 18 was prepared by gel polymerizing the electrolytic solution of Example 14 using a monomer and a polymerization initiator. Polyethylene glycol diacrylate (molecular weight: 258) in an amount of 5% by weight of the electrolyte solution of Example 14 was used as a monomer, and lauroyl peroxide in an amount of 1% by weight of the monomer was used as an initiator. Using the electrolyte solution of Example 18, a lithium polymer battery can be assembled by heating at 70° C. for 3 hours.

[0069] Table 2 gives the composition of the electrolyte, while...

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Abstract

Disclosed is an electrolyte for a rechargeable lithium battery including 5 to 40 volume % of at least one fluorine-substituted ether compound represented by R1-O-R2 (wherein R1 and R2 are alkyl groups substituted with fluorine), having a substitution ratio of hydrogen with fluorine of 57 to 86%, a viscosity of 0.9 to 2.3 cp, and a boiling point of at least 88° C., and 60 to 90 volume % of a non-aqueous organic solvent having a flash point of at least 80° C.

Description

[0001] Cross References to Related Applications [0002] This application is based on the Japanese Patent Application No. 2002-242299 filed with the Japan Patent Office on August 22, 2002, and the Korean Patent Application No. 2003-3968 filed with the Korean Intellectual Property Office on January 21, 2003. The disclosures thereof This article is incorporated by reference. technical field [0003] The present invention relates to an electrolyte solution for a rechargeable lithium battery and the rechargeable lithium battery, more particularly, the present invention relates to an electrolyte solution for a rechargeable lithium battery with good safety. Background technique [0004] Conventional solvents used in electrolytes of rechargeable lithium batteries include cyclic esters such as ethylene carbonate and propylene carbonate; chain esters such as dimethyl carbonate and propionate; and cyclic ethers such as tetrahydrofuran. However, conventional solvents are easily decom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/0525H01M10/0567H01M10/0569H01M10/36
CPCY02E60/12H01M10/0569H01M10/0525H01M2300/0025H01M10/0567Y02E60/10
Inventor 山口滝太郎清水竜一郑喆洙
Owner SAMSUNG SDI CO LTD
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