Lithium ion battery electrolyte with multistage structure and preparation method of lithium ion battery electrolyte

A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., to achieve the effects of improved cycle stability and safety, simple process, and easy industrialization

Inactive Publication Date: 2019-05-28
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts polyvinylidene fluoride-hexafluoropropylene, a fluorine-containing polymer having a co-solvent with aramid fiber, to be blended with aramid fiber, effectively solving the problem of solute precipitation in water-based fluorine-containing emulsions, and in polyvinylidene fluoride-hexafluoropropylene / Aramid system introduces a hydrophobic salt tetrabutylammonium hexafluorophosphate, which effectively avoids the interference of tetrabutylammonium chloride hydrophilicity on the performance of separators and batteries

Method used

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  • Lithium ion battery electrolyte with multistage structure and preparation method of lithium ion battery electrolyte
  • Lithium ion battery electrolyte with multistage structure and preparation method of lithium ion battery electrolyte
  • Lithium ion battery electrolyte with multistage structure and preparation method of lithium ion battery electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) the aramid fiber emulsion that concentration is 25wt% is dissolved in dimethylacetamide (the ratio of the two volumes is 1: 5) organic solvent, utilizes magnetic stirrer to stir 6 hours under normal temperature condition then to form the homogeneous mixing spinning solution.

[0024] (2) Slowly add the spinning solution configured in the above step (1) into the syringe, the inner diameter of the needle used is 0.3mm, and the extrusion rate of the needle solution is 0.2mL h -1 . A rotating cylinder covered with aluminum foil serves as a receiving device, and the receiving distance between the syringe tip and the collector is 11 cm. During the electrospinning process, the applied electrostatic voltage was 15KV. When the solvent evaporates, the aramid fiber membrane is obtained on the receiving device, and its fiber structure is as follows figure 1 shown.

[0025] (3) Place the aramid nanofiber membrane fiber membrane obtained in the above step (2) in a mixed solu...

Embodiment 2

[0027] (1) the aramid fiber emulsion that concentration is 25wt% is dissolved in dimethylacetamide (the ratio of the two volumes is 1: 5) organic solvent, utilizes magnetic stirrer to stir 6 hours under normal temperature condition then to form the homogeneous mixing solution, and on this basis, tetrabutylammonium hexafluorophosphate accounting for 1% of the mass fraction of the spinning solution was added and stirred at room temperature for 6 hours to form a uniform and stable spinning solution.

[0028] (2) Slowly add the spinning solution configured in the above step (1) into the syringe, the inner diameter of the needle used is 0.3mm, and the extrusion rate of the needle solution is 0.2mL h -1 . A rotating cylinder covered with aluminum foil serves as a receiving device, and the receiving distance between the syringe tip and the collector is 11 cm. During the electrospinning process, the applied electrostatic voltage was 15KV. After the solvent evaporates, the aramid pol...

Embodiment 3

[0031] (1) the aramid fiber emulsion that concentration is 25wt% is dissolved in dimethylacetamide (the ratio of the two volumes is 1: 5) organic solvent, utilizes magnetic stirrer to stir 6 hours under normal temperature condition then to form the homogeneous mixing solution, and on this basis, add tetrabutylammonium hexafluorophosphate accounting for 2% of the mass fraction of the spinning solution and stir at room temperature for 6 hours to form a uniform and stable spinning solution.

[0032] (2) Slowly add the spinning solution configured in the above step (1) into the syringe, the inner diameter of the needle used is 0.35mm, and the extrusion rate of the needle solution is 0.4mL h -1 . A rotating cylinder covered with aluminum foil serves as a receiving device, and the receiving distance between the syringe tip and the collector is 13 cm. During the electrospinning process, the applied electrostatic voltage is 20KV. After the solvent evaporates, the aramid polymer fibe...

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Abstract

The invention relates to a preparation method of a polymer electrolyte of a lithium ion battery. The electrolyte is prepared from a gelled polyvinylidene fluoride-hexafluoropropylene/aramid fiber composite film with a multistage structure and an electrolysis solution. The preparation method of the polymer electrolyte comprises the following steps: 1) uniformly stirring an aramid fiber emulsion, adimethylacetamide solvent and polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) according to a certain proportion, and adding a certain amount of hydrophobic salt tetrabutylammonium hexafluorophosphate to obtain a spinning solution; 2) preparing the polyvinylidene fluoride-hexafluoropropylene/aramid nanofiber composite film with a thickness of 30-50 [mu]m by utilizing an electrostatic spinning technology; and 3) immersing the composite film into a mixed solution of ethylene carbonate, lithium hexafluorophosphate and diethyl carbonate in a volume ratio of 1:1:1, and standing for 8 hours toprepare the polyvinylidene fluoride-hexafluoropropylene/aramid fiber polymer electrolyte. The prepared polymer electrolyte with the multistage structure for the lithium ion battery is good in lyophilic property, resistant to high temperature and high in strength, and has important significance for improving the electrochemical performance and the safety performance of the lithium ion battery.

Description

technical field [0001] The invention relates to lithium ion batteries, in particular to a hydrophobic polyvinylidene fluoride-hexafluoropropylene / aramid polymer electrolyte for lithium ion batteries and a preparation method thereof, belonging to the technical field of preparation of lithium ion battery diaphragms. technical background [0002] The emergence of energy crisis and the aggravation of environmental pollution make the development of safe, non-toxic and high specific energy green energy materials particularly necessary. The research and development of lithium-ion batteries are in line with this trend. It has the advantages of high specific energy, long cycle life, less environmental pollution, and no memory effect. It is widely used in new energy vehicles, aerospace, and various electric tools. fields are becoming more and more popular. Lithium-ion battery separator is a key component of lithium-ion batteries, and it is a vital component that affects the electroch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCY02E60/10
Inventor 康卫民赵慧娟程博闻邓南平闫静
Owner TIANJIN POLYTECHNIC UNIV
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