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Double-lithium salt type polymer composite electrolyte and preparation method thereof

A composite electrolyte and polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of poor rate performance of lithium batteries, low room temperature ion conductivity, etc., to improve ion conductivity and lithium ion content High, crystallinity reduction effect

Inactive Publication Date: 2020-03-06
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the current low room temperature ionic conductivity of PEO polymer electrolytes, resulting in poor rate performance of lithium batteries and other defects, the present invention proposes a double lithium salt polymer composite electrolyte and a preparation method, thereby improving the ionic conductivity of PEO polymer electrolytes , effectively promoting the development and application of PEO polymer electrolytes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add 20g of ethylenediaminetetraacetic acid and 30g of N-methylpyrrolidone into 100mL of deionized water to prepare a solution, then add it into a water bath, and stir evenly at a temperature of 90°C at a stirring speed of 60rpm for 30min to obtain a solution system;

[0032] (2) Add 90g of polyethylene oxide and 10g of lithium acetate into the solution system, then increase the rotation speed to 250rpm, and extend the glass catheter into the solution along the inner wall of the container, then slowly add 20% of the mass fraction at a rate of 5mL / min Copper chloride solution, while adding ammonia water to adjust the pH value to 8.5, the addition of copper chloride is 20g, after adding the copper chloride solution, continue to stir for 30min, naturally cool to room temperature after the stirring is completed, and obtain a mixed solution;

[0033] (3) Add 10g of lithium hexafluorophosphate and 5g of polyvinylpyrrolidone into the mixed solution, then use a glass rod to s...

Embodiment 2

[0035] (1) Add 30g of ethylenediaminetetraacetic acid and 50g of N-methylpyrrolidone into 100mL of deionized water to prepare a solution, then add it into a water bath, and stir evenly at a temperature of 95°C at a stirring speed of 120rpm for 30min to obtain a solution system;

[0036] (2) Add 100g of polyethylene oxide and 10g of lithium acetate into the solution system, then increase the speed to 280rpm, and extend the glass catheter into the solution along the inner wall of the container, and then slowly add 30% of the mass fraction at a rate of 3mL / min Copper chloride solution, while adding ammonia water to adjust the pH value to 8, the addition of copper chloride is 30g, after adding the copper chloride solution, continue to stir for 37min, naturally cool to room temperature after the stirring is completed, and obtain a mixed solution;

[0037] (3) Add 18g of lithium tetrafluoroborate and 8g of polyvinylpyrrolidone into the mixed solution, then use a glass rod to stir and...

Embodiment 3

[0039] (1) Add 22g of ethylenediaminetetraacetic acid and 35g of N-methylpyrrolidone into 120mL of deionized water to prepare a solution, then add it into a water bath, and stir evenly at a temperature of 92°C at a stirring speed of 70rpm for 36min to obtain a solution system;

[0040] (2) Add 85g of polyethylene oxide and 8g of lithium acetate into the solution system, then increase the speed to 270rpm, and extend the glass catheter into the solution along the inner wall of the container, then slowly add 35% of the mass fraction at a rate of 3mL / min Copper chloride solution, while adding ammonia water to adjust the pH value to 9, the addition of copper chloride is 35g, after adding the cupric chloride solution, continue to stir for 36min, and naturally cool to room temperature after stirring to obtain a mixed solution;

[0041] (3) Add 13g of lithium hexafluoroarsenate and 9g of polyvinylpyrrolidone into the mixed solution, then use a glass rod to stir and mix evenly, then use...

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Abstract

The invention provides a double-lithium salt type polymer composite electrolyte and a preparation method thereof. The polymer composite electrolyte is prepared by the following steps: mixing ethylenediamine tetraacetic acid, N-methyl pyrrolidone and deionized water and uniformly stirring in a water bath; then adding polyoxyethylene and lithium acetate and increasing the rotating speed for stirring, then adding a copper chloride solution and ammonia water for reaction, then adding a second lithium salt and polyvinylpyrrolidone and stirring uniformly, then coating the surface of a polytetrafluoroethylene substrate with the mixture by using a blade coating machine and finally drying to obtain the electrolyte. According to the double-lithium salt type polymer composite electrolyte, the complexing reaction of ethylenediamine tetraacetic acid and copper in a polyoxyethylene mixed system is utilized so that the crystallinity of a polymer can be reduced, lithium ions can be uniformly dispersedand adsorbed, the conductivity of the composite electrolyte is improved, and the ionic conductivity of the electrolyte is improved due to the double-lithium-salt characteristic and the rate capability of the lithium battery is improved.

Description

technical field [0001] The invention relates to the technical field of polymer solid electrolytes, in particular to a double lithium salt type polymer composite electrolyte and a preparation method thereof. Background technique [0002] With the development of high technology, lithium-ion batteries have been widely used in many fields such as electric vehicles, smart phones, and energy storage. People's requirements for the safety and energy density of lithium-ion batteries for consumer electronics and electric vehicles continue to increase. Lithium-ion batteries with traditional liquid organic electrolytes have electrolyte leakage and volatilization. Safety hazards such as explosions. Polymer electrolytes have been a research hotspot in the field of polymer materials in the past 20 years. They not only have good electrical conductivity, but also have the characteristics of light weight, good flexibility and elasticity, and easy film formation that are unique to polymer mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0565H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 陈庆李国松吕亚南曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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