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Dual-network hydrogel electrolyte and preparation and application thereof

A hydrogel and electrolyte technology, which is applied in the field of neutral double network hydrogel electrolyte material and its preparation, can solve the problems that the electrolyte cannot be used as a flexible all-solid supercapacitor and the mechanical properties of the hydrogel electrolyte are not high, and achieve high The effect of electrical conductivity and high mechanical strength

Active Publication Date: 2017-12-15
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the mechanical properties of PVA-based hydrogel electrolytes are not high enough to serve as electrolytes for highly bendable and compressible flexible all-solid-state supercapacitors

Method used

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  • Dual-network hydrogel electrolyte and preparation and application thereof
  • Dual-network hydrogel electrolyte and preparation and application thereof
  • Dual-network hydrogel electrolyte and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1, Li 2 SO 4 - Preparation of Agar / PAM hydrogel electrolyte

[0041] 1) Prepare 25.0g / L agarose, 3.40mol / L acrylamide, 2.55×10 -4 A mixed solution of mol / L N,N'-bismethylene acrylamide and 0.937mol / L lithium sulfate;

[0042] 2) Heating and stirring the mixed solution obtained in step 1) at 95° C. until completely dissolved to obtain a clear agarose sol;

[0043] 3) fully cooling the sol obtained in step 2) at room temperature to obtain agarose hydrogel;

[0044] 4) The hydrogel obtained in step 3) is irradiated and polymerized and cross-linked in air under γ-ray irradiation (dose rate is 10Gy / min, dose is 0.3kGy), forming Li 2 SO 4 - Agar / PAM hydrogel electrolyte system.

[0045] figure 1 In a) ~ b) is prepared Li 2 SO 4 - Optical photographs of the Agar / PAM hydrogel electrolyte. It can be seen from the figure that it has good transparency and flexibility.

[0046] figure 1 Middle c) is the prepared Li 2 SO 4 -SEM image of Agar / PAM hydrogel electr...

Embodiment 2

[0047] Example 2, Li 2 SO 4 - Ionic conductivity test of Agar / PAM hydrogel electrolyte

[0048] Different Li will be prepared 2 SO 4 content of Li 2 SO 4 -Agar / PAM hydrogel electrolyte using an electrochemical workstation at an open circuit voltage with an AC voltage amplitude of 14 mV and a frequency change from 10 6 The electrochemical impedance spectrum was measured under the condition of Hz to 1Hz, and then the ionic conductivity was calculated accordingly.

[0049] figure 2 for different concentrations of Li 2 SO 4 Li 2 SO 4 -Ionic conductivity change curve of Agar / PAM hydrogel electrolyte, in Li 2 SO 4 When the concentration is 0.937mol / L, the ion conductivity reaches the maximum value of 41mS / cm.

Embodiment 3

[0050] Example 3, Li 2 SO 4 -Mechanical property test of Agar / PAM hydrogel electrolyte

[0051] 1. Li 2 SO 4 - Compression performance test of Agar / PAM hydrogel electrolyte

[0052] The prepared Li 2 SO 4 - The Agar / PAM hydrogel electrolyte was cut into a cylinder with a height of about 10mm and a diameter of about 15mm, and its compressive stress-strain curve was measured using a material testing machine at a compression rate of 2mm / min.

[0053] image 3 In a) is Li 2 SO 4 - Compressive stress-strain curves of the Agar / PAM hydrogel electrolyte with a compressive strength of 116 ± 23 MPa and a maximum compressive strain of over 99%.

[0054] 2. Li 2 SO 4 - Tensile property test of Agar / PAM hydrogel electrolyte

[0055] The prepared Li 2 SO 4 - The Agar / PAM hydrogel electrolyte was cut into a dumbbell shape with a gauge length of 18mm, a width of 4mm, and a thickness of 2mm. The tensile stress-strain curve was measured using a material testing machine at a tensil...

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Abstract

The invention discloses a high-strength and high-conductivity neutral dual-network hydrogel electrolyte and a preparation method and an application thereof. The rigid and water-soluble natural high-molecular material is used as a first polymer network, the flexible and water-soluble synthetic high-molecular material acts as a second polymer network, the sulfate acts as neutral conductive inorganic salt, and the natural high-molecular / synthetic high-molecular neutral dual-network hydrogel electrolyte containing the sulfate is obtained by using the preparation method of gamma-ray or electron beam radiation polymerization crosslinking. The hydrogel electrolyte and activated carbon electrode are assembled into a flexible supercapacitor which has the same specific capacitance and better rate performance and charge and discharge cycling stability in comparison with the supercapacitor assembled by using the same sulfate aqueous solution as the electrolyte and also has excellent anti-compression and compression-resistant performance and anti-bending and bend-resistant performance.

Description

technical field [0001] The invention relates to a high-strength and high-conductivity neutral double-network hydrogel electrolyte material and a preparation method thereof, that is, a sulfate-containing natural macromolecule / Synthetic polymer double network hydrogel electrolyte and its application as a bendable and compressible solid electrolyte for flexible supercapacitors. Background technique [0002] With the increasing demand for energy in people's daily life, we urgently need to vigorously develop efficient energy storage devices, among which supercapacitors have been widely valued due to their long service life and high power density. Recent studies have shown that neutral hydrogel electrolytes show good application prospects in supercapacitors [Qian A, Zhuo K, et al. ACS Appl. Mater. Interfaces, 2016, 8(50): 34455-34463], It does not have the problem of leakage of liquid electrolyte, the problem of flammability of organic electrolyte, and the problem of corrosion o...

Claims

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Application Information

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IPC IPC(8): H01G11/56C08J3/075C08J3/24C08J3/28
CPCC08J3/075C08J3/246C08J3/28H01G11/56Y02E60/13
Inventor 翟茂林林廷睿石梦妮黄芙蓉彭静李久强
Owner PEKING UNIV
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