Storing method of vinylene carbonate

A vinylene carbonate and storage method technology, applied in the direction of organic chemistry and the like, can solve the problems of low vinylene carbonate deterioration rate, high vinylene carbonate deterioration rate, long storage time, etc., so as to reduce the preparation process and storage time. Extend and avoid spoilage effect

Active Publication Date: 2008-10-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of high vinylene carbonate deterioration rate and short storage time in existing vinylene carbonate storage methods, and provide a vinylene carbonate with low vinylene carbonate deterioration rate and long storage time How to store esters

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment is used to illustrate the storage method of vinylene carbonate provided by the present invention.

[0021] In the stainless steel airtight jar of 3000 milliliters of volumes, feed nitrogen 3 minutes with the speed of 10 liters / minute, then under nitrogen protection, 1000 grams of vinylene carbonate pure products (through GC-MS gas chromatography-mass spectrometry instrument The detection purity reaches 99.9%), 1000 grams of diethyl carbonate and a magnetic stirrer are added in the stainless steel airtight tank, after the addition is completed, feed nitrogen with a speed of 1 liter / min for 0.5 minutes, and then seal the airtight tank. A CD-3 magnetic stirrer (Shanghai Leici Xinjing Instrument Co., Ltd.) was used to stir at room temperature (25° C.) for 30 minutes to obtain a mixture of 2000 g of vinylene carbonate and ethylene carbonate in the sealed tank. The water content of the mixture of vinylene carbonate and ethylene carbonate was measured to be 200...

Embodiment 2

[0030] This embodiment is used to illustrate the storage method of vinylene carbonate provided by the present invention.

[0031] In the stainless steel airtight tank with stirring of 3000 milliliters of volume, feed nitrogen 3 minutes with the speed of 10 liters / minute, then under nitrogen protection, 1000 grams of vinylene carbonate pure product identical with embodiment 1, 1000 grams of carbonic acid Diethyl ester and a magnetic stirring bar were added into the stainless steel airtight tank, and after the addition, nitrogen gas was introduced at a rate of 1 liter / min for 0.5 minutes to seal the airtight tank. A CD-3 magnetic stirrer (Shanghai Leici Xinjing Instrument Co., Ltd.) was used to stir at room temperature (25° C.) for 30 minutes to obtain a mixture of 2000 g of vinylene carbonate and ethylene carbonate in the sealed tank. The mixture of vinylene carbonate and ethylene carbonate was taken as carrier gas with nitrogen, and passed through a drying column with a diamet...

Embodiment 3-6

[0033] Store vinylene carbonate according to the method of embodiment 2, the difference is, take the mixture of vinylene carbonate and organic solvent as the content of vinylene carbonate, the type of organic solvent and its content, the vinylene carbonate and The water content of the organic solvent mixture, as well as the storage temperature. See Table 1 for specific differences.

[0034] Table 1

[0035] Example 3

[0036] Respectively on the 60th day, the 90th day, the 120th day, the 150th day and the 180th day after storage, each sealed tank of embodiment 3-6 is sampled respectively, according to national standard GB 11903-89 " water quality chromaticity Determination of "Determination" method to measure the chromaticity of each sample, the chromaticity is higher than 50 degrees as deterioration, deterioration rate=100% × number of sealed cans deteriorated / total number of sealed cans, the test results are shown in Table 2.

[0037] Table 2

[0038] ...

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Abstract

Disclosed is a vinylene carbonate storage method. The method pressurizes the mixture of vinylene carbonate and organic solvent out of the sun; the organic solvent is one or more organic solvents which are in liquid state at normal temperature and do not react with vinylene carbonate at 0-25 DEG C. Storing the vinylene carbonate in the mixture of organic solvent, the method greatly reduces the deterioration rate of the vinylene carbonate under room temperature, thus remarkably prolonging storage time.

Description

technical field [0001] The invention relates to a method for storing carbonates, in particular to a method for storing vinylene carbonate. Background technique [0002] Vinylene carbonate (VC) is an ideal organic film-forming additive for lithium-ion secondary batteries. It can undergo free radical polymerization on the surface of the carbon negative electrode of lithium-ion secondary batteries to generate polyalkyllithium carbonate compounds, forming a solid electrolyte interphase (SEI) film with a compact structure but without increasing impedance, thereby effectively inhibiting the electrolyte solvent. The co-intercalation reaction of molecules has no side effects on the positive electrode, thereby improving the electrode capacity, cycle performance and service life of the lithium-ion secondary battery. [0003] Vinylene carbonate is a colorless transparent liquid at room temperature (20-25°C), with a melting point of 19-22°C, a boiling point of 165°C, a density (20°C) o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/40
Inventor 陆艳玲胡翼飞
Owner BYD CO LTD
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