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Lithium ion battery electrolyte and preparation method thereof

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems that pure aramid nanofibers cannot be gelled, aramid solutes are precipitated, and the polymerization process is complicated, etc., and achieve excellent thermal stability. The effect of stability and mechanical properties, high production efficiency and simple process

Inactive Publication Date: 2019-05-21
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure aramid nanofibers cannot achieve gelation
In order to improve its gel properties, the applicant team used fluorine-containing molecular polymerization (CN103258978A) and small-molecule fluorine-containing emulsion (Olifubao) (ZL201610889960.7) to modify pure aramid nanofibers in the early stage. The polymerization process is complicated and the operation is difficult, and the fluorine-containing emulsion is a water-based emulsion. When mixed with the aramid emulsion of the organic system, a slight excess of the fluorine-containing emulsion will easily cause aramid solute precipitation.

Method used

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  • Lithium ion battery electrolyte and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] (1) the aramid fiber emulsion that concentration is 15wt% is dissolved in dimethylacetamide (the ratio of the two volumes is 1: 5) in the organic solvent, utilizes magnetic stirrer to stir 6 hours under normal temperature condition then to form the homogeneous mixing solution, and then add a certain amount of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) powder (ratio to the mass of aramid fiber is 1:0) in the aramid / dimethylacetamide mixture, and then the formed The polyvinylidene fluoride-hexafluoropropylene / aramid fiber mixture was stirred at high speed for 12 hours at room temperature to form a uniform and stable spinning solution.

[0023] (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...

Embodiment 2

[0026] (1) the aramid fiber emulsion that concentration is 20wt% is dissolved in dimethylacetamide (the ratio of the two volumes is 1: 5) in the organic solvent, utilizes magnetic stirrer to stir 6 hours under normal temperature condition then to form the homogeneous mixing solution, and then add a certain amount of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) powder (ratio to the mass of aramid fiber is 20:1) in the aramid / dimethylacetamide mixture, and then the formed The polyvinylidene fluoride-hexafluoropropylene / aramid fiber mixture was stirred at high speed for 12 hours at room temperature to form a uniform and stable spinning solution.

[0027] (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 syrin...

Embodiment 3

[0030](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 then add a certain amount of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) powder (ratio to the mass of aramid fiber is 10:1) in the aramid / dimethylacetamide mixture, and then the formed The polyvinylidene fluoride-hexafluoropropylene / aramid fiber mixture was stirred at high speed for 12 hours at room temperature to form a uniform and stable spinning solution.

[0031] (2) Slowly add the spinning solution configured in the above step (1) into the syringe, the inner diameter of the needle used is 0.4mm, and the extrusion rate of the needle solution is 0.6mL h -1 . A rotating cylinder covered with aluminum foil serves as a receiving device, and the receiving distance between the syringe tip an...

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Abstract

The invention relates to a polyvinylidene fluoride-hexafluoropropylene / aramid polymer electrolyte for a lithium ion battery and a preparation method thereof, characterized in that the lithium ion battery electrolyte consists of a polyvinylidene fluoride-hexafluoropropylene / aramid composite membrane and electrolyte, and the preparation method includes the following steps that: 1) aramid emulsion, adimethylacetamide solvent and a polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) polymer that are prepared by adopting a low-temperature polymerization method are prepared according to a certain proportion and stirred evenly; 2) a polyvinylidene fluoride-hexafluoropropylene / aramid nanofiber composite membrane with a thickness of 30-50mum is prepared by using an electrostatic spinning technology; and 3) the polyvinylidene fluoride-hexafluoropropylene / aramid nanofiber composite membrane is immersed into a mixed solution of ethylene carbonate, lithium hexafluorophosphate and diethyl carbonate (volume ratio being 1: 1: 1), and stands for 8h to prepare a high-temperature resistant gelatinized polyvinylidene fluoride-hexafluoropropylene / aramid polymer electrolyte. The gelatinized polyvinylidene fluoride-hexafluoropropylene / aramid polymer electrolyte for the lithium ion battery prepared by the invention has good hydrophilicity, excellent thermal stability and excellent mechanical properties, and has very important significance for improving the electrochemical performance and safety performance of the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a polyvinylidene fluoride-hexafluoropropylene / aramid polymer electrolyte for a lithium ion battery and a preparation method thereof, belonging to the technical field of lithium ion battery diaphragm preparation. 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 electrochemical and safet...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCY02E60/10
Inventor 康卫民赵慧娟程博闻邓南平赵义侠
Owner TIANJIN POLYTECHNIC UNIV
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