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Nonaqueous electrolyte solution, electrochemical device, lithium ion secondary cell, and module

A non-aqueous electrolyte and lithium-ion technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, electrolytic capacitors, etc., can solve the problems of unrecorded impurities and reduced discharge capacity, and achieve excellent storage characteristics and high-voltage cycle characteristics Effect

Inactive Publication Date: 2015-06-03
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Patent Document 1 does not describe the impurities of its compounds
In addition, if such a non-aqueous electrolyte secondary battery is placed in a high-temperature environment, or is repeatedly charged and discharged, there will be a problem that the discharge capacity will decrease.

Method used

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  • Nonaqueous electrolyte solution, electrochemical device, lithium ion secondary cell, and module
  • Nonaqueous electrolyte solution, electrochemical device, lithium ion secondary cell, and module
  • Nonaqueous electrolyte solution, electrochemical device, lithium ion secondary cell, and module

Examples

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Embodiment

[0179] Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited to these Examples.

Synthetic example 1

[0180] Synthesis Example 1CF 3 CH 2 OCO 2 CH 3 synthesis method

[0181] A 10 L four-necked flask was provided with a reflux tube and a dropping funnel to prepare a reaction apparatus. Then, add CF under ice bath 3 CH 2 OH (750 g; 7.5 moles), methyl chloroformate (708.8 g; 7.5 moles) and diglyme (700 mL) as solvent and stirred. Then, using a dropping funnel, triethylamine (758.3 g; 7.5 mol) was added while paying attention to heat generation. Triethylamine hydrochloride gradually precipitated, and the reaction solution changed to milky white.

[0182] After the reaction was completed, the reaction solution was washed with 1N aqueous HCl solution.

[0183] The organic layer separated after washing was rectified using a distillation refining column with 10 trays. About 5% of the initial distillation was discarded, and roughly equal samples were taken in the order of distillation, thus obtaining CF 3 CH 2 OH (compound (I-1)), CH 3 OH (compound (II-1)), CH 3 Rectifica...

Synthetic example 2

[0187] Synthesis Example 2 CF 3 CH 2 OCO 2 C 2 h 5 synthesis method

[0188] A 10 L four-necked flask was provided with a reflux tube and a dropping funnel to prepare a reaction apparatus. Then, add CF under ice bath 3 CH 2 OH (750 g; 7.5 moles), ethyl chloroformate (813.3 g; 7.5 moles) and diglyme (1250 mL) as solvent and stirred. Then, using a dropping funnel, triethylamine (758.3 g; 7.5 mol) was added while paying attention to heat generation. Triethylamine hydrochloride gradually precipitated, and the reaction solution changed to milky white. After the reaction was completed, the reaction solution was washed with 1N HCl aqueous solution.

[0189] The organic layer separated after washing was rectified using a distillation refining column with 10 trays. About 5% of the initial distillation was discarded, and roughly equal samples were taken in the order of distillation, thus obtaining CF 3 CH 2 OH (compound (I-1)), C 2 h 5 OH (compound (II-2)), C 2 h 5 Recti...

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Abstract

The purpose of the present invention is to provide a nonaqueous electrolyte with which there can be obtained a lithium ion secondary cell having excellent high-temperature storage characteristics and high-voltage cycle characteristics. The present invention is a nonaqueous electrolyte containing a nonaqueous solvent and an electrolyte salt, wherein the nonaqueous electrolyte is characterized in that the nonaqueous solvent contains (A) a fluorine-containing chain carbonate represented by the general formula (1) RfOCOOR (wherein Rf is a C1-4 fluorinated alkyl group, and R is a C1-4 alkyl group) and (B) at least one cyclic carbonate selected from the group consisting of EC, PC, and FEC, the fluorine-containing chain carbonate (A) and the cyclic carbonate (B) respectively containing 5000 ppm or less and 50 ppm or less of a compound (α) and a compound (β) as impurities.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution containing a nonaqueous solvent and an electrolyte salt in which the content of a specific compound is reduced, an electrochemical device, a lithium ion secondary battery, and a module including the nonaqueous electrolytic solution. Background technique [0002] As a non-aqueous electrolyte solution for electrochemical devices such as lithium-ion secondary batteries, LiPF is generally used by dissolving LiPF in non-aqueous solvents such as ethylene carbonate, propylene carbonate, and dimethyl carbonate. 6 、LiBF 4 A non-aqueous electrolyte solution obtained from an electrolyte salt. However, since the hydrocarbon-based solvent has a low oxidation potential as described above, it is considered that the electrolytic solution will be decomposed when a high voltage is applied in the future. [0003] Patent Document 1 discloses that a non-aqueous electrolytic secondary battery using a fluo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01G9/035H01M10/052H01M10/0567
CPCH01G11/50H01G11/60H01G11/64H01M10/052H01M10/0567H01M10/0569H01M2300/0034H01M2300/0037Y02E60/10Y02E60/13H01G9/035H01G9/145H01M10/0525
Inventor 坂田英郎高明天山崎穣辉山内昭佳贺川米基璐中园葵
Owner DAIKIN IND LTD
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