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Ion conducting polymer electrolyte and secondary battery using the same

An ion-conducting, polymer-based technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, solid electrolytes, etc., can solve the problems of high volatility, insufficient compressive strength, and inability to obtain stable and reliable batteries, and achieve excellent formability and processability, good safety and reliability, and good chemical stability

Inactive Publication Date: 2009-10-21
NOF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these liquid electrolytes have high volatility and low chemical stability
Therefore, there may be a case that when the battery is used in a high temperature environment, it may expand, and in the worst case, it may explode / burn
In addition, especially when using LiMn in the cathode 2 o 4 When the active material is used, for example, there is a problem that the battery capacity rapidly deteriorates due to the dissolution of manganese
However, such a polymer electrolyte has insufficient compressive strength, for example, in the case of application to a laminate type battery using a flexible case
In addition, there are the following problems: the electrical properties of the electrolyte are significantly lowered in a high-temperature environment, and a battery with high stability and high reliability cannot be obtained

Method used

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  • Ion conducting polymer electrolyte and secondary battery using the same
  • Ion conducting polymer electrolyte and secondary battery using the same
  • Ion conducting polymer electrolyte and secondary battery using the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0100] Add 207.6 g (2.0 moles) of trimethyl borate to 350 g (2.0 moles) of polyethylene glycol (the average number of moles introduced is 2.2) monomethacrylate and 203 g (1.0 moles) of polypropylene glycol (the average number of moles introduced is 2.4) In monomethacrylate. The resulting mixture was kept at 60° C. for 1 hour, and stirred in a dry air atmosphere. Thereafter, the mixture was heated to 75°C, and then the internal pressure of the system was gradually lowered. The system was kept at a pressure of 2.67 kPa (20 mmHg) or lower for 6 hours, thereby removing volatile substances and excess trimethyl borate generated along with the progress of the transesterification reaction of the boric acid ester. Thereafter, the reaction mixture was filtered, thereby obtaining 557 g of a polymerizable boron-containing compound A represented by formula (1). The obtained infrared absorption spectrum of the polymerizable boron-containing compound A was examined. The results confirmed ...

preparation example 2

[0102] 207.6 g (2.0 moles) of trimethyl borate were added to 1,539 g (3.0 moles) of polyethylene glycol (average number of moles incorporated was 9.8) monoacrylate. The resulting mixture was kept at 60° C. for 1 hour, and stirred in a dry air atmosphere. Thereafter, the mixture was heated to 75°C, and then the internal pressure of the system was gradually lowered. The system was kept at a pressure of 2.67 kPa (20 mmHg) or lower for 6 hours, thereby removing volatile substances and excess trimethyl borate generated along with the progress of the transesterification reaction of the boric acid ester. Thereafter, the reaction mixture was filtered, thereby obtaining 1,486 g of a polymerizable boron-containing compound B represented by formula (1). The obtained infrared absorption spectrum of the polymerizable boron-containing compound B was examined. The results confirmed that at 3,300cm -1 The absorption band attributable to the hydroxyl group disappears. The molecular structu...

preparation example 3

[0104] 207.6 g (2.0 moles) of trimethyl borate were added to 525 g (3.0 moles) of polyethylene glycol (average number of moles incorporated was 2.2) monomethacrylate. The resulting mixture was kept at 60° C. for 1 hour, and stirred in a dry air atmosphere. Thereafter, the mixture was heated to 75°C, and then the internal pressure of the system was gradually lowered. The system was kept at a pressure of 2.67 kPa (20 mmHg) or lower for 6 hours, thereby removing volatile substances and excess trimethyl borate generated along with the progress of the transesterification reaction of the boric acid ester. Thereafter, the reaction mixture was filtered, thereby obtaining 520 g of a polymerizable boron-containing compound C represented by formula (1). The obtained infrared absorption spectrum of the polymerizable boron-containing compound C was examined. The results confirmed that at 3,300cm -1 The absorption band attributable to the hydroxyl group disappears. The molecular structu...

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Abstract

Disclosed is an ion conducting polymer electrolyte for electrical devices which has low volatility, excellent formability and workability, high compression strength and good ion conductivity over a wide temperature range from normal temperature to high temperature, while exhibiting good chemical stability under high temperature conditions. Also disclosed is a secondary battery using such an ion conducting polymer electrolyte, which has a practically sufficient output over a wider temperature range, while exhibiting good safety and reliability under high temperature conditions. Specifically disclosed are an ion conducting polymer electrolytefor electrochemical devices and a secondary battery using the ion conducting polymer electrolyte, which comprise a polymerizable boron-containing compound represented by the formula (1) below, a polymer compound represented by the formula (2) below and an electrolyte salt. In the formula (1), B represents a boron atom; Z, Z and Z independently represent a polymerizable functional group having an unsaturated double bond; AO, AO and AO independently represent an oxyalkylene group having 2-6 carbon atoms; and h, i and j independently represent an average mole number of added oxyalkylene groups that is a number of 1-10. RO-(AO)k-R (2) In the formula (2), R and R independently represent a hydrocarbon group having 1-10 carbon atoms; AO represents an oxyalkylene group having 2-6 carbon atoms; and k represents an average mole number of added oxyalkylene groups that is a number of 4-20; and the plurality of AO's may be the same or different from one another.

Description

technical field [0001] The present invention relates to an ion-conductive polymer electrolyte and a secondary battery using the same. Background technique [0002] In recent years, market demands for performance / function improvement or size / weight / thickness reduction of various electronic / electrical devices have been remarkably increased. In order to achieve this requirement, batteries as energy supply devices need to have higher energy density and higher output density. [0003] Therefore, conventional lead storage batteries, nickel-cadmium storage batteries, and hydrogen-nickel storage batteries are rapidly being replaced with lithium ion secondary batteries having higher energy density and higher output density. [0004] From the viewpoint of ion conductivity, a liquid electrolyte prepared by dissolving an electrolyte salt in a nonaqueous solvent such as carbonate is used as an electrolyte for a lithium ion secondary battery. However, these liquid electrolytes have high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/052H01M10/0565H01M10/36
CPCY02E60/122H01M10/052H01M2300/0082H01M10/0565C08F230/06Y02E60/10C08F230/065H01M10/0525
Inventor 伊藤哲哉德中健真水谷雅人一宫谦吾
Owner NOF CORP