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Bio-based gel polymer electrolyte and preparation method thereof

A gel-based and polymer-based technology, applied in the field of bio-based gel polymer electrolytes and their preparation, can solve the problem of affecting the electrochemical stability and safety of batteries, ionic conductivity that cannot meet application requirements, and polymer membrane pore distribution Inhomogeneity and other problems, to achieve the effect of good industrialization prospects, strong practicability, and good amorphousness

Inactive Publication Date: 2021-04-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the good regularity of the molecular chain of the single polymer matrix, the polymer film has a certain crystallization behavior, which hinders the movement of the molecular chain, resulting in an ion conductivity that cannot meet the application requirements.
[0006] Existing methods for preparing polymer electrolyte membrane skeleton mainly include solution casting method, extraction activation method, phase separation / inversion method, etc. Among them, the solution casting method is to dissolve the polymer in a conventional solvent and pour it into a specific mold for molding. Solvation of lithium salts, it is difficult to ensure solvent removal
The extraction activation method is to add a plasticizer to the polymer solution system, and then use solvent extraction to remove the plasticizer after pouring into a film to obtain a polymer porous film. The polymer film obtained by this method has uneven pore distribution; phase separation / inversion The method avoids the extraction process of the plasticizer, and the obtained polymer gel electrolyte has good electrochemical and mechanical properties, but the residual solvent will affect the electrochemical stability and safety of the battery.

Method used

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  • Bio-based gel polymer electrolyte and preparation method thereof
  • Bio-based gel polymer electrolyte and preparation method thereof
  • Bio-based gel polymer electrolyte and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of this PAN / PLLA bio-based gel polymer electrolyte provided by the invention comprises the following steps:

[0036] (1) Weigh a certain amount of PAN powder and add it to 10ml N,N-dimethylformamide solvent, stir at 50°C and 700r / min until completely dissolved, and obtain C PAN =0.08g / mL light yellow transparent solution;

[0037] (2) press m PAN :m PLLA =3:1 mass ratio Weigh the PLLA powder and add it to the PAN solution obtained in step (1), stir at 50°C and 700r / min until completely dissolved, then continue stirring under this condition for 12h;

[0038] (3) Add the PAN / PLLA blended homogeneous solution obtained in step (2) into a 10ml syringe, inject under the conditions of low voltage -0.1kV and high voltage 15kV, and the injection speed is under the condition of 0.065mm / min The electrospinning electrospinning time is 10h;

[0039] (4) Put the PAN / PLLA blended polymer skeleton membrane obtained in step (3) into a vacuum drying oven for 12...

Embodiment 2

[0044] The preparation method of this PAN / PLLA bio-based gel polymer electrolyte provided by the invention comprises the following steps:

[0045] (1) Weigh a certain amount of PAN powder and add it to 10ml N,N-dimethylformamide solvent, stir at 50°C and 700r / min until completely dissolved, and obtain C PAN =0.08g / mL light yellow transparent solution;

[0046] (2) press m PAN :m PLLA =7:1 mass ratio Weigh the PLLA powder and add it to the PAN solution obtained in step (1), stir at 50°C and 700r / min until completely dissolved, then continue stirring under this condition for 12h;

[0047] (3) Add the PAN / PLLA blended homogeneous solution obtained in step (2) into a 10ml syringe, inject under the conditions of low voltage -0.1kV and high voltage 15kV, and the injection speed is under the condition of 0.007mm / min Carry out electrospinning, electrospinning time is 11h;

[0048] (4) Put the PAN / PLLA blended polymer skeleton film obtained in step (3) into a vacuum drying oven for...

Embodiment 3

[0052] The preparation method of this PAN / PLLA bio-based gel polymer electrolyte provided by the invention comprises the following steps:

[0053] (1) Weigh a certain amount of PAN powder and add it to 10ml N,N-dimethylformamide solvent, stir at 50°C and 700r / min until completely dissolved, and obtain C PAN =0.10g / mL light yellow transparent solution;

[0054] (2) press m PAN :m PLLA =5:1 mass ratio Weigh the PLLA powder and add it to the PAN solution obtained in step (1), stir at 50°C and 700r / min until completely dissolved, then continue stirring under this condition for 12h;

[0055] (3) Add the PAN / PLLA blended homogeneous solution obtained in step (2) into a 10ml syringe, inject under the conditions of low voltage -0.1kV and high voltage 15kV, and the injection speed is under the condition of 0.007mm / min Electrospinning is carried out; the electrospinning time is 12h;

[0056] (4) Put the PAN / PLLA blended polymer skeleton membrane obtained in step (3) into a vacuum dr...

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Abstract

The invention discloses a bio-based gel polymer electrolyte with stable electrochemical performance and built by nanofibers and a preparation method thereof. A membrane skeleton is a blend nanofiber membrane of PAN and PLLA or a blend nanofiber membrane of PAN, PLLA and CS. In the PAN and PLLA blended nanofiber membrane, the mass ratio of PAN to PLLA is (1-7): 1; in the PAN, PLLA and CS blended nanofiber membrane, the mass ratio of PAN to PLLA is (2-4): 1, and the molar ratio of CS to PLLA is (2-3.5): 1. The nanofiber membrane adopts a plurality of polymers, and the performance complementation among the plurality of polymers is utilized, so that the prepared polymer membrane has better electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a bio-based gel polymer electrolyte and a preparation method thereof. Background technique [0002] An ideal solid electrolyte must have high ionic conductivity, excellent chemical and electrochemical stability, and low synthesis cost. Compared with inorganic solid electrolytes, gel polymer electrolytes not only have good mechanical properties of solid electrolytes, but also High ionic conductivity with liquid electrolyte. Therefore, lithium ions in the gel polymer electrolyte can be transported not only by the movement of the polymer chain, but also by the swollen gel phase or liquid phase. Gel polymers are considered to be the best candidates to replace commercial liquid electrolytes. [0003] Polyacrylonitrile (PAN) is widely used in the construction of polymer electrolyte membrane skeleton due to its high ionic conductivity and electrochemical oxidati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058D04H1/4382D04H1/728D04H3/005D04H3/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00D04H1/4382D04H1/728D04H3/005D04H3/02H01M10/0565H01M10/058H01M2300/0091Y02E60/10Y02P70/50
Inventor 潘安强柴思敏
Owner CENT SOUTH UNIV
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