Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Lithium ion battery gel polymer electrolyte and preparation method thereof

A gel polymer and lithium-ion battery technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of delithiation cycle, lithium ions cannot be effectively intercalated, etc., and achieve good compatibility, electrochemical The effect of wide window and high charge-discharge cycle capacity

Inactive Publication Date: 2014-06-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
View PDF2 Cites 39 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical purpose of the present invention is to provide a gel polymer electrolyte for lithium-ion batteries in view of the shortcomings of the above-mentioned gel polymer electrolyte. The lithium-ion battery using this electrolyte not only has good electrical conductivity, but also greatly improves its high-temperature safety. At the same time, it also solves the problem that lithium ions in ionic liquids cannot perform effective intercalation and delithiation cycles.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium ion battery gel polymer electrolyte and preparation method thereof
  • Lithium ion battery gel polymer electrolyte and preparation method thereof
  • Lithium ion battery gel polymer electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this embodiment, the lithium-ion battery gel polymer electrolyte consists of the following components:

[0040] Polymer: polyvinylidene fluoride PVDF, polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP)

[0041]Ionic liquid: bis(trifluoromethylsulfonyl)imide 1-methyl-3-ethylimidazole (EmimTFSI)

[0042] Organic solvents: ethylene carbonate (EC), propylene carbonate (PC)

[0043] Lithium salt: lithium bis(trifluoromethylsulfonyl)imide (LiTFSI)

[0044] Film-forming additive: ethylene carbonate (VEC)

[0045] Wherein, the mass ratio of the ionic liquid, organic solvent, lithium salt and film-forming additive is 3:2:2:3:0.5; the quality of the high molecular polymer and the ionic liquid, organic solvent, lithium salt and forming additive The mass and ratio of membrane additives is 1:3.

[0046] The preparation method of above-mentioned lithium ion battery gel polymer electrolyte comprises the steps:

[0047] (1) Mix polyvinylidene fluoride (PVDF) with polyvinyli...

Embodiment 2

[0057] In this embodiment, the lithium-ion battery gel polymer electrolyte consists of the following components:

[0058] Polymer: polyvinylidene fluoride PVDF,

[0059] Ionic liquid: 1-methyl-3-ethylimidazole tetrafluoroborate (EmimBF4)

[0060] Organic solvent: propylene carbonate (PC)

[0061] Lithium salt: lithium tetrafluoroborate (LiBF 4 )

[0062] Film-forming additives: and vinylene carbonate (VC)

[0063] Wherein, the mass ratio of described ionic liquid, organic solvent, lithium salt and film-forming additive is 1:1:1:0.1; The mass sum ratio is 1:3.

[0064] The preparation method of above-mentioned lithium ion battery gel polymer electrolyte comprises the steps:

[0065] (1) Dissolve polyvinylidene fluoride PVDF in N-methylpyrrolidone (NMP) under heating and stirring (60°C), where the mass ratio of PVDF:NMP is 1:8, and stir and dissolve for 2 hours to obtain PVDF-based body fluids, the solution is clear and transparent;

[0066] (2) 1-methyl-3-ethylimidazole...

Embodiment 3

[0072] In this embodiment, the lithium-ion battery gel polymer electrolyte consists of the following components:

[0073] Polymer: polyvinylidene fluoride PVDF,

[0074] Ionic liquid: 1-methyl-3-ethylimidazole tetrafluoroborate (EmimBF4)

[0075] Organic solvent: propylene carbonate (PC)

[0076] Lithium salt: lithium tetrafluoroborate (LiBF 4 )

[0077] Film-forming additives: and vinylene carbonate (VC)

[0078] Wherein, the mass ratio of described ionic liquid, organic solvent, lithium salt and film-forming additive is 1:1:1:0.1; The ratio of the mass and sum is 1:2.5.

[0079] The preparation method of above-mentioned lithium ion battery gel polymer electrolyte comprises the steps:

[0080] (1) Dissolve polyvinylidene fluoride (PVDF) in acetone under heating and stirring (60°C), where the mass ratio of PVDF: acetone is 1:10, stir and dissolve for 2 hours to obtain a PVDF matrix liquid, which is clear and transparent;

[0081] (2) 1-methyl-3-ethylimidazole tetrafluo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
electrical conductivityaaaaaaaaaa
Login to View More

Abstract

The invention provides a lithium ion battery gel polymer electrolyte and a preparation method thereof. The lithium ion battery electrolyte is composed of a macromolecular polymer, an ionic liquid, an organic solvent, a lithium salt and a film-forming additive. Through preparation of the gel polymer electrolyte, the disadvantages of leakage, easy corrosion of electrode materials and the like can be eliminated. The high temperature performance of the electrolyte can be improved by using an ionic liquid. By adding the organic solvent, the viscosity of the ionic liquid is reduced and the conductivity is enhanced. And by adding the film-forming additive, the problem of poor compatibility between the ionic liquid and graphite or a lithium electrode material can be solved. Experiments prove that the lithium ion battery gel polymer electrolyte provided by the invention is an elastic self-supporting electrolyte membrane, which has ionic conductivity up to the 10<-3>S / cm magnitude order, good high temperature stability and safety, and has good compatibility with a lithium cathode or a graphite cathode material. Lithium ions can undergo effective lithium insertion and removal circulation, and can achieve high capacity when applied to lithium ion battery charge-discharge cycle.

Description

technical field [0001] The invention belongs to the field of preparation of polymer electrolytes for lithium ion batteries, and in particular relates to a gel polymer electrolyte for lithium ion batteries and a preparation method thereof. Background technique [0002] Due to the advantages of high power density, low self-discharge rate, no memory effect and stable discharge voltage, lithium-ion batteries have gradually replaced traditional lead-acid batteries and nickel-cadmium batteries and become the main choice of power batteries. [0003] At present, the operating temperature range of lithium-ion batteries is -20°C to 60°C, and the high-power output performance of power batteries poses a major challenge to the maximum operating temperature and working safety of lithium-ion batteries. The use of a safe electrolyte system is the most direct way to solve the safety problem of lithium-ion batteries. Therefore, it is a new requirement for power lithium batteries to research ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0525H01M10/0565Y02E60/10
Inventor 薛立新魏增斌聂锋陶慷盛建芳
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products