Solid-state lithium battery polymer electrolyte containing PEO side chain segment and preparation method thereof

An electrolyte and solid-state lithium technology, which is applied in the field of solid-state lithium battery polymer electrolyte and preparation, can solve the problems of large internal resistance of batteries, high ion conductivity, and low lithium ion conductivity, so as to improve lithium ion conductivity and improve lithium ion conductivity. Effect of ion concentration and transfer efficiency improvement

Inactive Publication Date: 2020-11-24
CHENDU NEW KELI CHEM SCI CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] According to the above, the solid polymer electrolytes used in lithium batteries in the existing schemes often have the problem of high ion conductivity. Among them, the crystallinity of the PEO solid polymer electrolyte is high, and the mobility of lithium ions is low. The low lithium ion conductivity, large battery internal resistance, and poor rate performance restrict the development of PEO solid polymer electrolytes. The present invention proposes a solid lithium battery polymer electrolyte containing PEO side chain segments and a preparation method. Can effectively solve the above technical problems

Method used

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  • Solid-state lithium battery polymer electrolyte containing PEO side chain segment and preparation method thereof

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Embodiment 1

[0027] (1) Add dimercaptobutane, acrylate and polyoxyethylene chloride-terminated macromonomers with a molecular weight of 1000 to toluene, then raise the temperature, keep warm in a water bath and stir evenly to obtain a mixed material; dimercaptobutyl The alkane is 1,4-dimercaptobutane; the acrylate is methyl acrylate; the temperature of the water bath is 67°C, the speed of constant stirring is 170r / min, and the time is 36min;

[0028] (2) First add azobisisobutyronitrile to the mixed material obtained in step (1), then keep the water bath at a constant temperature and increase the speed of stirring for 2.5 minutes, then stop adding azobisisobutyronitrile, and continue stirring for 1 hour to obtain PMMA -g-PEO material; the lifting speed is 270r / min;

[0029] (3) First add N,N-diethylethylamine to the PMMA-g-PEO material obtained in step (2), continue the reaction for 3.5 hours, then add lithium salt electrolyte, mix and stir for 1 hour, and then use a centrifuge for solidif...

Embodiment 2

[0033] (1) Add dimercaptobutane, acrylate and polyoxyethylene chloride-terminated macromonomers with a molecular weight of 1000 to toluene, then raise the temperature, keep warm in a water bath and stir evenly to obtain a mixed material; dimercaptobutyl The alkane is 2,2-dimercaptobutane; the acrylate is ethyl acrylate; the temperature of the water bath is 66°C, the speed of constant stirring is 160r / min, and the time is 38min;

[0034] (2) First add azobisisobutyronitrile to the mixture obtained in step (1), then keep the water bath at a constant temperature and increase the speed of stirring for 2 minutes, then stop adding azobisisobutyronitrile, continue stirring for 1.5 hours to obtain PMMA -g-PEO material; the lifting speed is 260r / min;

[0035] (3) First add N,N-diethylethylamine to the PMMA-g-PEO material obtained in step (2), continue the reaction for 3 hours, then add lithium salt electrolyte, mix and stir for 1.5 hours, and then use a centrifuge for solidification T...

Embodiment 3

[0039] (1) Add dimercaptobutane, acrylate and polyoxyethylene chloride-terminated macromonomers with a molecular weight of 1000 to toluene, then raise the temperature, keep warm in a water bath and stir evenly to obtain a mixed material; dimercaptobutyl The alkane is 2,3-dimercaptobutane; the acrylate is 2-methyl methacrylate; the temperature of the water bath is 69°C, the speed of constant stirring is 190r / min, and the time is 32min;

[0040] (2) First add azobisisobutyronitrile to the mixture obtained in step (1), then keep the water bath at a constant temperature and increase the speed of stirring for 3 minutes, then stop adding azobisisobutyronitrile, continue stirring for 1 hour, and obtain PMMA- g-PEO material; the lifting speed is 290r / min;

[0041] (3) First add N,N-diethylethylamine to the PMMA-g-PEO material obtained in step (2), continue the reaction for 4 hours, then add lithium salt electrolyte, mix and stir for 1 hour, and then use a centrifuge for solid-liquid ...

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Abstract

The invention relates to the field of lithium battery electrolytes, and discloses a solid-state lithium battery polymer electrolyte containing a PEO side chain segment and a preparation method. The preparation method comprises the following steps: (1) adding Butanedithiol, acrylate and polyoxyethylene macromonomers into toluene, and heating and stirring to obtain a mixed material; (2) adding azodiisobutyronitrile into the mixed material obtained in the step (1), and carrying out a constant-temperature stirring reaction to obtain a PMMA-g-PEO material; and (3) firstly adding N, N-diethylethylamine for reaction, then adding a lithium salt electrolyte for mixing and centrifugal separation, and finally drying a solid product to obtain the solid-state lithium battery polymer electrolyte containing the PEO side chain segment. The solid-state lithium battery polymer electrolyte containing the PEO side chain segment has the advantages of low crystallinity, high lithium ion migration efficiency, good lithium salt adsorbability, increase of the lithium ion concentration, and substantial increase of the lithium ion conductivity of the polymer electrolyte.

Description

technical field [0001] The invention relates to the field of lithium battery electrolytes, and discloses a solid lithium battery polymer electrolyte containing PEO side chain segments and a preparation method thereof. Background technique [0002] Lithium batteries have the absolute advantages of high working voltage, high energy density, high power density, long cycle life, low self-discharge rate, fast charge and discharge, no memory effect, green environmental protection and no pollution. It is an ideal chemical power source recognized internationally today. It is widely used in electronic products, vehicles, military fields and energy storage. At present, most lithium batteries at home and abroad use liquid electrolytes. The liquid electrolyte itself is extremely unstable, and it is easy to decompose and cause battery inflation. At the same time, it is easy to burn and explode under high temperature, short circuit, overcharge or physical collision, posing a great safety ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/052H01M10/42C08F283/06C08F220/14
CPCC08F283/06H01M10/052H01M10/0565H01M10/058H01M10/4235C08F220/14Y02E60/10Y02P70/50
Inventor 陈庆李国松司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD
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