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Activated gel state lithium ionic cell polymer electrolyte film, preparation and use thereof

A technology of lithium ion battery and electrolyte film, applied in the field of activated gel state lithium ion battery polymer electrolyte film and its preparation, can solve the problem that the electrochemical and interface stability cannot meet the requirements of large-scale application, difficult lithium ion battery, Problems such as poor mechanical properties and interface stability, to achieve the effects of excellent mechanical stability and film formation, simple process, and improved interface stability

Inactive Publication Date: 2009-01-28
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductivity of this type of electrolyte at room temperature can reach 10 -3 S / cm, although the synthesis of composite polymer electrolytes using methods such as blending, copolymerization, and adding nano-inorganic fillers in the prior art can improve the ionic conductivity and mechanical strength of the polymer film, but its electrochemical and interfacial stability performance is still relatively low. Can not meet the requirements of large-scale application
Therefore, although this type of polymer film meets the requirements of ionic conductivity, it still has problems such as poor mechanical properties and interfacial stability, which makes it difficult to apply to commercial lithium-ion batteries.

Method used

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  • Activated gel state lithium ionic cell polymer electrolyte film, preparation and use thereof
  • Activated gel state lithium ionic cell polymer electrolyte film, preparation and use thereof
  • Activated gel state lithium ionic cell polymer electrolyte film, preparation and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Synthetic method of activated gel state lithium ion battery polymer electrolyte:

[0026] (1) purification to obtain polymer monomer acrylonitrile (AN) and vinyl acetate (VAc) (AN: VAc=7: 3 molar ratio): the monomer AN and VAc used are analytically pure, and the polymerization inhibitor is removed by distillation Hydroquinone, wherein VAc distillation purification is carried out under normal pressure at a temperature of 72°C;

[0027] (2) in N 2 Under the atmosphere, dissolve 0.3% polyvinyl alcohol in mass percentage in 65% deionized water, stir at 500r / min for 10min, and disperse evenly; add 34% polymer monomer and mass The percentage is 0.4% of the crosslinking agent polyvinyl alcohol dimethacrylate, stir well, add the initiator azobisisobutyronitrile (AIBN) of 0.3% by mass at 65 ° C, and obtain a white emulsion after 6 hours of reaction ;

[0028] (3) Filter the white emulsion, wash it with water for 3 times, wash off the unreacted monomer with ethanol with a mass...

Embodiment 2

[0039] (1) purification to obtain polymer monomer acrylonitrile (AN) and vinyl acetate (VAc) (AN: VAc=9: 1 molar ratio): the monomer AN and VAc used are analytically pure, and the polymerization inhibitor is removed by distillation Hydroquinone, wherein VAc distillation purification is carried out under normal pressure at a temperature of 72°C;

[0040] (2) in N 2 Under atmosphere, dissolve 0.4% polyvinyl alcohol in mass percentage in deionized water with 69% mass percentage, stir for 15 min at 400r / min, and disperse evenly, then add 30% polymer monomer and 0.1% Cross-linking agent polyvinyl alcohol dimethacrylate, stir evenly, add 0.5% initiator azobisisobutyronitrile (AIBN) at 60° C.; react to obtain white emulsion after 6 hours;

[0041] (3) Filter the white emulsion, wash it with water for 3 times, and then use ethanol with a mass ratio of 1:1: deionized water and acetone: deionized water to wash away unreacted monomers, and wash the mixture under N at 60 ° C. 2 Purging ...

Embodiment 3

[0046] (1) Purification to obtain polymer monomer acrylonitrile and (AN) vinyl acetate (VAc) (AN: VAc=5: 5 molar ratio): the monomer AN and VAc used are analytically pure, and the polymerization inhibitor is removed by distillation Hydroquinone, wherein VAc distillation purification is carried out under normal pressure at a temperature of 72°C;

[0047] (2) in N 2 Under the atmosphere, dissolve 0.2% polyvinyl alcohol in mass percentage in 64% deionized water, stir at 450r / min for 12min, and disperse evenly; add 35% polymer monomer and mass The percentage is 0.5% of the crosslinking agent dipropylene phthalate, stir evenly, and add the initiator sodium persulfate with a mass percentage of 0.3% at 62 ° C, and react for 8 hours to obtain a white emulsion;

[0048] (3) Filter the white emulsion, wash it with water for 3 times, wash off the unreacted monomer with ethanol with a mass ratio of 1:1: deionized water and acetone with a mass ratio of 1:1: deionized water successively, a...

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Abstract

The invention provides an activated form gel type lithium ion battery polyelectrolyte film, a preparation method and application thereof. The invention prepares P(AN-VAc) powder by using monomer acrylonitrile and vinyl acetate or prepares P(AN-MMA) power by using acrylonitrile and methyl methacrylate; and prepares a P(AN-VAc) or P(AN-MMA) polymeric matrix film on the basis; an activated form polymer film is obtained by drying after the P(AN-VAc) or P(AN-MMA) polymeric matrix film is immersed into polymethyl methacrylate gel to be activated, and an activated form gel type lithium ion battery polyelectrolyte is obtained by immersing the activated form polymer film into an electrolytic solution. Compared with the unactivated P(AN-VAc) polyelectrolyte film, the activated form P(AN-VAc) / PMMA polyelectrolyte film obtained by adopting the technology of the invention has better absorbency, room-temperature conductivity, electrochemical stability and the interface stability of electrolyte and lithium electrode; the performance of a lithium secondary battery prepared by using activated electrolyte is obviously better than the performance of the lithium secondary battery prepared by using the unactivated polyelectrolyte; the invention has simple technology, short reaction time, and convenient and easy condition for technologized production.

Description

technical field [0001] The invention relates to an activated gel-state lithium-ion battery polymer electrolyte film and a preparation method thereof, belonging to the technical field of chemical power sources. Background technique [0002] Since Bellcore in the United States used high molecular polymers to develop polymer lithium-ion batteries (PLIB) in 1994, since its shape can be thinned and arbitrarily shaped, it can ensure full contact inside the battery and greatly Improving the flexibility of battery shape design, while polymer lithium-ion batteries have the advantages of light weight, high specific energy, and good safety performance, has become a research hotspot in lithium-ion batteries in recent years. A key component of a polymer lithium-ion battery is a polymer electrolyte. Polymer electrolytes can be divided into gel polymer electrolytes (GPE) and solid polymer electrolytes (SPE) according to their morphology. Gel polymer electrolytes have become a current rese...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J7/00C08L33/20C08F220/44C08F218/08C08F220/14H01M10/38H01M10/40H01M10/056H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 饶睦敏刘建生李伟善廖友好梁英赵灵智
Owner SOUTH CHINA NORMAL UNIVERSITY
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