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Ionic liquid-lithium salt gel polymer electrolyte and preparation and application thereof

A technology of gel polymers and ionic liquids, which is applied in the manufacture of hybrid capacitor electrolytes and hybrid/electric double layer capacitors, etc., can solve the problems of wide electrochemical window, good cycle stability, and increased crystallinity, and achieve high ion density. Conductivity, improve flexibility, weaken the effect of damage

Active Publication Date: 2015-09-30
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an organic salt conductive medium, ionic liquids have low conductivity. Inorganic salts as a conductive medium will increase the crystallinity of the gel, and easily destroy the hydrogen bond between the polymer chain and water, which will lead to the loss of the polymer chain. Coagulation
So far, a GPE with wide electrochemical window, high conductivity and good cycle stability has not been realized.

Method used

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  • Ionic liquid-lithium salt gel polymer electrolyte and preparation and application thereof
  • Ionic liquid-lithium salt gel polymer electrolyte and preparation and application thereof
  • Ionic liquid-lithium salt gel polymer electrolyte and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1, different Li 2 SO 4 ContentPVA-BMImCl-Li 2 SO 4 Preparation of Gel Polymer Electrolyte and Measurement of Its Conductivity

[0044] 1) Prepare a 10wt% PVA aqueous solution, place it in a 90°C oven for 24 hours, and form a uniformly dispersed PVA aqueous solution;

[0045] 2) Take out 10g of the 10wt% PVA aqueous solution prepared in step 1), add 3.0g of BMImCl ionic liquid, stir at 50°C, mix 0.5g, 1.0g, 1.5g, 2.0g, 2.5g, 2.6g, 2.7g, 2.8g, 3.0gLi 2 SO 4 were dissolved in 15g of deionized water to prepare a solution, and then different concentrations of Li 2 SO 4 The solution was added to the corresponding PVA-BMImCl system, and stirred at 50°C for 30min;

[0046] 3) After transferring the mixed solution obtained in step 2) into a petri dish, move it into the cold trap of a lyophilizer to freeze for 60min, and then freeze-dry for 24h to prepare the PVA-BMImCl-Li 2 SO 4 Gel polymer electrolyte.

[0047] The prepared PVA-BMImCl-Li 2 SO 4 Gel polym...

Embodiment 2

[0049] Embodiment 2, the preparation of active carbon electrode.

[0050] 1) The nickel foam was dried by ultrasound for 24 hours, cut into discs with a radius of 7.5 mm using a circular mold, and recorded its initial mass m1.

[0051] 2) According to activated carbon: acetylene black: polyvinylidene fluoride (PVDF) = 8:1:1 (mass ratio), take the sample in an agate mortar, add an appropriate amount of N-methylpyrrolidone (NMP) dropwise and grind it into a paste shape. And spread it evenly on the nickel foam cut out in 1), and put it in a 60°C oven to dry for 24h.

[0052] 3) After taking out the electrode sheet in 2), press it with a pressure of 40MPa, and record its mass m 2 . Calculate the activated carbon mass of the coated electrode material, and the average mass of each electrode sheet is 8 mg.

Embodiment 3

[0053] Embodiment 3, different Li 2 SO 4 ContentPVA-BMImCl-Li 2 SO 4 Preparation and Morphology Characterization of Gel Polymer Electrolyte

[0054] 1) Consistent with the preparation method of Example 1, Li 2 SO 4 PVA-BMImCl-Li with content of 20.0wt%, 33.3wt%, 38.5wt%, 42.9wt% 2 SO 4 Gel polymer electrolyte;

[0055] 2) The prepared PVA-BMImCl-Li 2 SO 4The gel polymer electrolyte was freeze-dried for 72 hours, and the morphology of GPE was characterized using a Hitachi, S-4800 scanning electron microscope (SEM).

[0056] figure 2 for different Li 2 SO 4 ContentPVA-BMImCl-Li 2 SO 4 Electron micrograph of the gel polymer electrolyte, when Li 2 SO 4 When the content is higher than 38.5wt%, the interior of the GPE has Li 2 SO 4 Crystallized out.

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Abstract

The invention discloses an ionic liquid-lithium salt gel polymer electrolyte and preparation and application thereof. The novel ionic liquid-lithium salt gel polymer electrolyte is prepared by freeze-drying with the polymer serving as a substrate, the ionic liquid serving as dispersant and the lithium salt serving as a conductive medium, and is assembled into a super capacitor with activated carbon electrodes. The ionic liquid-lithium salt gel polymer electrolyte, as the material of the super capacitor, has good flexibility, excellent electrical conductivity and superb cycle stability. Compared with the same type of gel electrolytes, the electrolyte has higher specific capacitance, energy density and power density.

Description

technical field [0001] The invention relates to an ionic liquid-lithium salt gel polymer material, a preparation method thereof, and an application thereof as an electrolyte for a supercapacitor. Background technique [0002] Among numerous energy storage devices, electrochemical energy storage systems, such as batteries and capacitors, are energy storage devices with high efficiency and no pollution to the environment. Compared with batteries, supercapacitors have wider application prospects due to their high power density, energy density, cycle efficiency and Coulomb efficiency, long cycle life, fast charge and discharge speed, and environmental friendliness. Therefore, Supercapacitors are ideal for storing energy. Currently, supercapacitors are used in a wide range of applications. For example, using the advantages of supercapacitors to support high-current charging and discharging, long cycle life, and good low-temperature performance, connect supercapacitors to automo...

Claims

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Application Information

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IPC IPC(8): H01G11/56H01G11/84
CPCY02E60/13H01G11/56H01G11/84
Inventor 翟茂林王亮亮张星彭静李久强
Owner PEKING UNIV
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