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A kind of non-combustible solid polymer electrolyte and its application in solid secondary battery

A solid polymer and polymer technology, applied in secondary batteries, secondary battery repair/maintenance, electrolyte immobilization/gelation, etc., can solve the problem of inability to ensure solid-state battery combustion and explosion accidents, no popularization and application, and complex synthesis and other problems, to achieve the effect of good electrode interface stability, excellent mechanical properties, and high ionic conductivity

Active Publication Date: 2020-04-17
柔电(武汉)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, polymer electrolytes commonly used in polymer solid-state electrolytes, such as polyethylene oxide and polycarbonate, are combustible in flames, so it is impossible to ensure that the solid-state batteries made of them are extremely unlikely to cause combustion and explosion accidents.
Some people have studied polyphosphazene solid-state electrolytes, but they have not been widely used due to the complexity of synthesis and high price.

Method used

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  • A kind of non-combustible solid polymer electrolyte and its application in solid secondary battery
  • A kind of non-combustible solid polymer electrolyte and its application in solid secondary battery
  • A kind of non-combustible solid polymer electrolyte and its application in solid secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Diethylene glycol polymethylphosphonate: put 0.1mol (10.6g) diethylene glycol in a 100mL three-neck flask equipped with a spherical condenser, and place it under N at room temperature 2 Under the condition of protection, use a syringe to take 0.1mol (13.3g) of dichloromethylphosphine and slowly drop it into a three-necked bottle (about 0.5h). It was incubated at ℃ for 2h, and at 80℃ for 1h. After cooling, a light yellow solid was obtained.

[0031] The concrete structural formula of gained polymer is:

[0032]

Embodiment 2

[0034] Polymethyl triethylene glycol bisphosphonate: Put 0.1mol (15.0g) triethylene glycol bis in a 100mL three-neck flask equipped with a spherical condenser, and place at room temperature under N 2 Under the condition of protection, use a syringe to take 0.1mol (13.3g) of dichloromethylphosphine and slowly drop it into a three-necked bottle (about 0.5h). It was incubated at ℃ for 2 hours, and then kept at 80℃ for 1 hour, then cooled to obtain a light yellow solid.

[0035] The specific structural formula of the obtained polymer is

[0036]

Embodiment 3

[0038] Trimethylolpropane polymethylphosphonate: Put 0.12mol (16.08g) trimethylolpropane in a 100mL three-necked flask equipped with a spherical condenser, and melt at 60°C, N 2 Under protected conditions, use a syringe to draw 0.18mol (23.94g) of dichloromethylphosphine and slowly drop it into a three-necked flask (about 1h). Pale yellow solid.

[0039] The concrete structural formula of gained polymer is:

[0040]

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Abstract

The invention discloses a non-combustible solid polymer electrolyte, which is characterized in that it comprises a polyphosphate polymer and a metal salt compound, wherein the metal salt compound accounts for 10-90% by mass of the entire solid polymer electrolyte. The solid polymer electrolyte of the present invention has high phosphorus content, and has a methylphosphine structure, excellent flame retardancy, no combustion at all, excellent mechanical properties, high ion conductivity, wide electrochemical window and good electrode interface stability, especially It is suitable for high-safety and high-energy-density energy storage batteries, and has very broad application prospects in the fields of military, aerospace, electric vehicles, and large-scale energy storage power stations.

Description

technical field [0001] The invention relates to a solid polymer electrolyte, in particular to a non-combustible solid polymer electrolyte and its application in solid secondary batteries. Background technique [0002] The electrolytes of existing electrochemical energy storage batteries such as lithium ion batteries mainly include liquid organic carbonate solvents, lithium salts and polyolefin separators. The use of a large amount of organic electrolyte is easy to leak and volatilize, and it is easy to catch fire and burn, and even cause an explosion accident, which affects the safety performance of the battery. On the other hand, the thermal stability of the polyolefin separator is relatively poor. When the battery is heated or under extreme conditions, the separator will shrink or melt, resulting in a short circuit of the battery, resulting in a fire and explosion accident. The all-solid-state lithium battery that replaces the organic liquid electrolyte with a solid elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/42
CPCH01M10/0565H01M10/4235H01M2300/0085H01M2300/0091Y02E60/10
Inventor 刘继延刘学清刘志宏曹元成尤庆亮周敏邹立勇高淑豫
Owner 柔电(武汉)科技有限公司
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