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Process for producing boric acid ester compound, electrolyte for electrochemical device, and secondary battery

A boron compound and compound technology, which are applied in the field of producing boronic acid ester compounds with oxyalkylene groups, and can solve the problems of reduced potential stability, deterioration of electrolyte properties, and reduced charge-discharge cycle performance, etc.

Inactive Publication Date: 2007-01-10
NOF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like this, still keep above-mentioned restriction when obtaining high-purity boric acid ester
[0013] Thus, when such a borate ester containing a large amount of impurities is used as a raw material of an electrolyte, there is a high possibility of occurrence of problems leading to deterioration of electrolyte properties, such as an increase in solid electrolyte interfacial (SEI) resistance, charge-discharge cycle Performance reduction, and reduction in potential stability, etc.
In particular, as far as electrolytes are concerned as lithium ion secondary batteries, there is a large tendency that impurities contained in borate compounds react with lithium to generate gas, thereby causing a problem of lowering the safety of secondary batteries.

Method used

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  • Process for producing boric acid ester compound, electrolyte for electrochemical device, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Add 34.6 grams (0.333 moles) of trimethyl borate to 550 grams (1.0 moles) of methoxypolyethylene glycol raw material with a molecular weight of 550, and the mixture is heated to 60° C. under stirring and a nitrogen atmosphere. After keeping the mixture at 60°C for 1 hour, the temperature was gradually raised to 120°C over 1 hour. When reaching 120° C., the system was gradually evacuated and maintained at a pressure of 2.67 kPa or lower (below 20 mmHg) for 3 hours, while removing volatile substances generated during the reaction. Filtration was then carried out to give 520 g of borate ester compound.

Embodiment 2

[0118] To 654 g (1.5 mol) of polyethylene glycol (350) monomethacrylate (BLEMMER PE-350 manufactured by NOF Corporation) as a raw material was added 51.9 g (0.5 mol) of trimethyl borate, and the mixture was stirred and dried Heat to 60°C under air protection. After keeping the mixture at 60°C for 1 hour, the temperature was raised to 75°C. When the temperature reached 75° C., the system was gradually evacuated and the pressure was maintained at or below 2.67 kPa for a total of 6 hours, while removing volatile substances generated during the reaction. Filtration was then carried out to give 625 g of a borate ester compound which could be polymerized.

Embodiment 3

[0120] Add 51.9 g (0.5 mol) of trimethyl borate to 708 g (1.5 mol) of polyethylene glycol (400) monoacrylate (BLEMMER PE-350 manufactured by NOF Corporation) as a raw material, and stir and dry the air The mixture was heated to 60°C. After the mixture was maintained at 60°C for 1 hour, the temperature was raised to 70°C. When the temperature reaches 70° C., the system is gradually evacuated and the system pressure is maintained at 2.67 kPa or lower for 6 hours, while removing volatile substances produced during the reaction. Filtration was then carried out to give 670 g of polymerizable borate ester compound.

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Abstract

A process for producing a boric acid ester compound which comprises esterifying a compound represented by the formula (1): X-[O(AO)n-H]a (1) wherein X represents a group independently selected from a residue of a compound having 1 to 6 hydroxyl groups, an acryloyl group and a methacryloyl group with a boron-containing compound represented by the formula (2): (RO)3-B (2) wherein R represents an alkyl group having 1 to 4 carbon atoms. The present invention can provide a boric acid ester compound which has a high ion conductivity, which is useful as a material for an electrochemical device, such as a secondary battery or a capacitor, having excellent safety and which is low in water and impurity contents, a polymer electrolyte containing the boric acid ester compound, and a secondary battery using the polymer electrolyte.

Description

Technical field: [0001] The present invention relates to a method for producing borate compounds having oxyalkylene groups, to using such borate compounds or polymers thereof as electrolytes in electrochemical devices, and to accumulators. Background technique: [0002] In recent years, there has been a strong demand for high-performance and compact electronic devices. Thus, storage battery materials such as lithium ion storage batteries, which are energy sources for such electronic devices, are also required to be compact, light in weight, and have high electric capacity and high energy density. As a result, various researches and developments have been conducted on secondary batteries. Generally, lithium-ion batteries have a configuration of a positive electrode containing metal oxides, a negative electrode containing carbonaceous materials, a separator and an electrolyte liquid sandwiched between the two electrodes. Such a secondary battery having a high energy density ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F5/04H01B1/06H01M10/40H01M10/052H01M10/0565H01M10/36
CPCY02E60/122H01M2300/0025H01M10/0565H01M2300/0082H01M10/052C08G65/328C07F5/04C08G65/3322Y02E60/10
Inventor 横山晶一矢部健
Owner NOF CORP