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A preparation method of gel electrolyte and a preparation method of supercapacitor

A gel electrolyte and supercapacitor technology, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrolytes, etc., can solve the problems of poor cycle performance, low ionic conductivity of gel electrolytes, complicated preparation processes, etc., so as to reduce residual , excellent cycle stability, the effect of improving ionic conductivity

Active Publication Date: 2022-06-21
GUANGZHOU AUTOMOBILE GROUP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems that the existing gel electrolyte preparation process for supercapacitors has complicated preparation process and the prepared gel electrolyte has low ionic conductivity and poor cycle performance, the present invention provides a preparation method of gel electrolyte and a preparation of supercapacitor method

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  • A preparation method of gel electrolyte and a preparation method of supercapacitor
  • A preparation method of gel electrolyte and a preparation method of supercapacitor

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preparation example Construction

[0027] An embodiment of the present invention provides a method for preparing a gel electrolyte, comprising the following steps:

[0028] Dissolve PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene) in NMP (N-methylpyrrolidone) / acetone mixed solvent, apply the obtained PVDF-HFP glue evenly on the flat substrate, separate and dry to obtain the electrolyte matrix;

[0029] The electrolyte matrix is ​​combined with the electrolyte solution to obtain a gel electrolyte.

[0030] The preparation method of the gel electrolyte uses PVDF-HFP as the electrolyte matrix, and its ionic conductivity is >10 -3 S / cm, the assembled supercapacitor was cycled for 1000 cycles at a current density of 1A / g, and the capacity retention rate was 93%, showing excellent cycle stability. As an improvement of the present invention, a mixed solvent of NMP / acetone is used to dissolve PVDF-HFP, which can effectively disperse PVDF-HFP, and at the same time effectively reduce the residue of solvent in the...

Embodiment 1

[0055] This embodiment is used to illustrate the supercapacitor disclosed in the present invention and its preparation method, including the following steps:

[0056] (1) Glue preparation: Dissolve PVDF-HFP (molecular weight 40w) with a mass fraction of 15wt% in a mixed solvent of NMP / acetone to obtain PVDF-HFP glue, wherein the mass ratio of NMP:acetone is 1.5:1, and Stir for 24 hours, and vacuumize to remove the air bubbles in the PVDF-HFP glue;

[0057] (2) Substrate preparation: Use the coating machine to coat the PVDF-HFP glue solution obtained in step (1) evenly on the glass substrate coated with polyimide, and after drying for 48h under natural conditions, separate the substrate from the glass substrate , punched into a preset size, and dried under vacuum for 6 hours to obtain an electrolyte matrix;

[0058] (3) Preparation of gel electrolyte: Prepare a special electrolyte for supercapacitors in an argon atmosphere, immerse the electrolyte matrix obtained in step (2) i...

Embodiment 2

[0063] This embodiment is used to illustrate the supercapacitor disclosed in the present invention and its preparation method, including the following steps:

[0064] (1) Glue preparation: Dissolve PVDF-HFP (molecular weight 45w) with a mass fraction of 20wt% in a mixed solvent of NMP / acetone to obtain PVDF-HFP glue, wherein the mass ratio of NMP:acetone is 0.5:1, at room temperature Stir for 24 hours, and vacuumize to remove the air bubbles in the PVDF-HFP glue;

[0065] (2) Substrate preparation: use the coating machine to apply the PVDF-HFP glue solution obtained in step (1) evenly on the glass substrate coated with polyimide, dry under natural conditions for 60h, after that, the substrate and glass The substrate is separated, punched into a preset size, and dried under vacuum for 6 hours to obtain an electrolyte matrix;

[0066] (3) Preparation of gel electrolyte: Prepare a special electrolyte solution for supercapacitors in an argon atmosphere, immerse the electrolyte ma...

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Abstract

In order to overcome the problems of complex preparation process and the low ionic conductivity and poor cycle performance of the prepared gel electrolyte in the existing gel electrolyte preparation process for supercapacitors, the invention provides a preparation method of the gel electrolyte, comprising the following operations Steps: Dissolve PVDF‑HFP in NMP / acetone mixed solvent, apply the obtained PVDF‑HFP glue evenly on a flat substrate, separate and dry to obtain an electrolyte matrix; compound the electrolyte matrix with the electrolyte to obtain a gel electrolyte. At the same time, the invention provides a preparation method of the supercapacitor. The gel electrolyte prepared by the preparation method provided by the invention has higher ion conductivity and better cycle performance.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a preparation method of a gel electrolyte and a supercapacitor preparation method. Background technique [0002] According to the energy storage mechanism, supercapacitors can be divided into two types: electric double layer capacitors and pseudocapacitors. They have the characteristics of fast charging and discharging, high power density, etc., and can be widely used in rail transit, buses, electric vehicles and other fields. However, in the fast charging process, the use of high-rate current will lead to safety hazards such as explosion and combustion of organic liquid electrolytes, which will affect the widespread use of supercapacitors. [0003] Solid electrolyte is a new type of material system developed on the basis of liquid energy storage device configuration. The research on solid electrolyte represents the frontier direction of future energy storage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/56H01G11/84
CPCH01G11/56H01G11/84Y02E60/13
Inventor 王津松顾晓瑜欧先国
Owner GUANGZHOU AUTOMOBILE GROUP CO LTD
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