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Non-aqueous electrolytic solution, and non-aqueous electrolyte battery comprising same

A non-aqueous electrolyte, non-aqueous technology, applied in non-aqueous electrolyte batteries, electrolytes, lithium batteries, etc., can solve problems such as no clear records, and achieve the effect of improving continuous charging characteristics and improving overcharging characteristics.

Inactive Publication Date: 2012-05-30
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, Patent Document 2 describes aromatic compounds such as 1-acetoxy-2-fluorobenzene, 1-acetoxy-3-fluorobenzene, and 1-acetoxy-4-fluorobenzene as additives for batteries. It is effective, but it is not clearly documented which characteristics can be improved

Method used

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  • Non-aqueous electrolytic solution, and non-aqueous electrolyte battery comprising same
  • Non-aqueous electrolytic solution, and non-aqueous electrolyte battery comprising same
  • Non-aqueous electrolytic solution, and non-aqueous electrolyte battery comprising same

Examples

Experimental program
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Effect test

Embodiment 1

[0398] In a mixed solvent of ethylene carbonate (EC) as a saturated cyclic carbonate, dimethyl carbonate (DMC) as a chain carbonate, and ethyl methyl carbonate (EMC) (mixing volume ratio 2:7:1) In the 1mol / L ratio, LiPF as the electrolyte 6 After dissolving, 4-fluorophenyl acetate and vinylene carbonate (VC) were added so as to make them 2% by weight with respect to the total weight of the electrolytic solution, respectively, to prepare a non-aqueous electrolytic solution. Using the obtained non-aqueous electrolytic solution, a lithium secondary battery was manufactured according to the above-mentioned method, and a capacity evaluation test, an overcharge characteristic evaluation test, and a storage characteristic evaluation test were performed. The results are shown in Table 1.

Embodiment 2

[0400] In a mixed solvent of ethylene carbonate (EC), propylene carbonate (PC) as a saturated cyclic carbonate, and dimethyl carbonate (DMC) as a chain carbonate (mixing volume ratio 2:1:7 ), LiPF as electrolyte is made at a ratio of 1mol / L 6 After dissolving, 4-fluorophenyl acetate and vinylene carbonate (VC) were added so as to make them 2% by weight with respect to the total weight of the electrolytic solution, respectively, to prepare a non-aqueous electrolytic solution. Using the obtained non-aqueous electrolytic solution, a lithium secondary battery was manufactured according to the above-mentioned method, and a capacity evaluation test, an overcharge characteristic evaluation test, and a storage characteristic evaluation test were performed. The results are shown in Table 1.

Embodiment 3

[0402] In a mixed solvent of ethylene carbonate (EC) as a saturated cyclic carbonate, dimethyl carbonate (DMC) as a chain carbonate, and ethyl methyl carbonate (EMC) (mixing volume ratio 2:7:1) In the 1mol / L ratio, LiPF as the electrolyte 6 After dissolving, 4-fluorophenyl acetate and vinylene carbonate (VC) were added so as to make them respectively 4% by weight and 2% by weight relative to the total weight of the electrolyte solution to prepare a non-aqueous electrolyte solution. Using the obtained non-aqueous electrolytic solution, a lithium secondary battery was manufactured according to the above-mentioned method, and a capacity evaluation test, an overcharge characteristic evaluation test, and a storage characteristic evaluation test were performed. The results are shown in Table 1.

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Abstract

Disclosed are: a non-aqueous electrolytic solution which comprises a lithium salt and a non-aqueous organic solvent, and which is characterized in that the non-aqueous organic solvent contains at least one component selected from the group consisting of a saturated cyclic carbonate, a linear carbonate and an aliphatic carboxylic acid ester in the total amount of more than 90 vol%, and a fluorine-substituted aromatic ester compound represented by general formula (1) is additionally contained in an amount of 0.01 to 10 wt% relative to the total weight of the non-aqueous electrolytic solution; and a non-aqueous electrolyte battery comprising the non-aqueous electrolytic solution. Xn-Ph-OCOR (1) [In general formula (1), Ph represents a phenylene group; R represents a hydrocarbon group which has 1 to 12 carbon atoms and may be substituted by a fluorine atom; X represents a fluorine atom, or a fluorine-substituted alkyl group having 1 to 12 carbon atoms; and n represents an integer of 1 to 4.] Also disclosed are: a non-aqueous electrolytic solution which comprises an electrolyte and a non-aqueous solvent, and which is characterized by additionally containing a compound represented by general formula (3); and a non-aqueous electrolyte battery comprising the non-aqueous electrolytic solution. [In general formula (3), R1 represents a hydrocarbon group which has 1 to 12 carbon atoms and may be substituted by a fluorine atom; R2 to R6 independently represent a hydrogen atom, a fluorine atom, or an alkyl group which has 1 to 12 carbon atoms and may be substituted by a fluorine atom, wherein at least one of R2 to R6 represents an alkyl group which has 2 or more carbon atoms and may be substituted by a fluorine atom; and n represents an integer of 0 or 1, wherein at least one of R2 to R6 represents an alkyl group which has 5 or more carbon atoms and may be substituted by a fluorine atom when n is 1.]

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution and a nonaqueous electrolyte battery using the nonaqueous electrolytic solution. Background technique [0002] Lithium secondary batteries have the advantages of high energy density and low self-discharge. Therefore, in recent years, it has been widely used in power supplies for consumer portable devices such as mobile phones, notebook computers, and PDAs. [0003] A common electrolytic solution for a lithium secondary battery contains a lithium salt as a supporting electrolyte and a non-aqueous solvent as main components. For the non-aqueous solvent used, it is required to have a high dielectric constant to dissociate the lithium salt, to exhibit high ionic conductivity in a wide temperature range, and to be stable in batteries, etc. Wait. [0004] Because it is difficult to realize the above-mentioned requirement by a kind of solvent, therefore, generally high boiling point solven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052H01M10/0569
CPCY02E60/122H01M10/056H01M10/0569H01M10/0568H01M10/0525H01M10/0567Y02E60/10H01M10/0563H01M10/052H01M2300/002
Inventor 大贯正道古田土稔深水浩二町田裕美子大桥洋一
Owner MITSUBISHI CHEM CORP
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