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A crosslinked polymer electrolyte suitable for lithium secondary battery and a preparation method thereof

A cross-linked polymer, lithium secondary battery technology, applied in the field of electrolytes, can solve the problems of limited application, low room temperature ionic conductivity, etc., and achieve the effects of simple preparation, high room temperature conductivity, and good flexibility

Active Publication Date: 2018-12-18
HARBIN INST OF TECH WUXI RES INST OF NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polyoxyethylene and polyoxypropylene can be used as all-solid-state polymer electrolytes, however, their low room-temperature ionic conductivity due to their crystalline nature limits their applications.

Method used

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  • A crosslinked polymer electrolyte suitable for lithium secondary battery and a preparation method thereof
  • A crosslinked polymer electrolyte suitable for lithium secondary battery and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Polyethylene glycol diglycidyl ether (molecular weight 200) 4g, trimethylolpropane-tris(mercaptopropionate) 4g, add to the beaker, stir well, add 2.25g lithium trifluoromethanesulfonate, wait until completely dissolved Finally, 0.03 g of tetrabutylammonium fluoride was added, mixed evenly, coated on the glass surface, and heated at 70° C. for 4 hours to obtain a cross-linked polymer electrolyte membrane.

Embodiment 2

[0026] Polypropylene glycol diglycidyl ether (molecular weight 600) 5g, tetrakis (3-mercaptopropionate) pentaerythritol ester 3g, add to the beaker, after stirring evenly, add 4.7g of lithium perchlorate, after completely dissolving, add benzyl triethyl Mix 0.05 g of ammonium chloride evenly, apply it to the glass surface, and heat at 70° C. for 4 hours to obtain a cross-linked polymer electrolyte membrane.

Embodiment 3

[0028] Polyethylene glycol diglycidyl ether (molecular weight 1000) 5g, tetrakis (3-mercaptopropionate) pentaerythritol ester 4g, add to the beaker, after stirring evenly, add 8g of bistrifluoromethanesulfonimide lithium, after completely dissolving , add 0.08 g of triethylamine and mix evenly, apply it on the glass surface, and heat at 80°C for 2 hours to obtain a cross-linked polymer electrolyte membrane.

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Abstract

The invention discloses a crosslinked polymer electrolyte suitable for a lithium secondary battery and a preparation method thereof. The electrolyte is crosslinked by a low molecular weight polyetherderivative under the action of a crosslinking agent. The electrolyte has the advantages of simple preparation, high room temperature conductivity, good flexibility and oxidation decomposition potential of higher than 4.5 V.

Description

technical field [0001] The invention relates to the field of electrolytes, in particular to a cross-linked polymer electrolyte suitable for lithium secondary batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, large output power, high voltage, small self-discharge, wide operating temperature range, no memory effect, and environmental friendliness. They have been used in electric vehicles, rail transit, large-scale energy storage, and aerospace. field. At present, commercial lithium-ion batteries use organic liquid electrolytes. The electrolyte and electrode materials are prone to side reactions during charge and discharge, resulting in irreversible decline in battery capacity. Drying, leakage and other phenomena will affect the battery life. Solid electrolytes have higher safety and ease of operation due to non-leakage, easy packaging and wide operating temperature range, and solid elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/052H01M10/0565H01M2300/0082Y02E60/10
Inventor 白永平赵彦彪安茂忠陈国荣白杨李卫东殷晓芬
Owner HARBIN INST OF TECH WUXI RES INST OF NEW MATERIALS
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