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High-concentration aqueous zinc ion electrolyte, electrochromic device containing electrolyte and method

A technology of electrochromic devices and zinc ions, applied in instruments, nonlinear optics, optics, etc., can solve problems affecting the electrochemical stability of electrochromic devices, affecting zinc ion deintercalation, and affecting electrochromic performance, etc. Achieve the effects of improving the electron de-intercalation rate, excellent color memory effect, and considerable application prospects

Pending Publication Date: 2021-12-07
XI AN JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrochemical activity of aqueous zinc-ion electrolytes is limited by the narrow electrochemical window of water (1.23V), and the side reactions between zinc ions and free water molecules will affect the deintercalation of zinc ions in electrochromic materials, further affecting Electrochemical stability of electrochromic devices, thereby affecting electrochromic performance

Method used

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  • High-concentration aqueous zinc ion electrolyte, electrochromic device containing electrolyte and method
  • High-concentration aqueous zinc ion electrolyte, electrochromic device containing electrolyte and method
  • High-concentration aqueous zinc ion electrolyte, electrochromic device containing electrolyte and method

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preparation example Construction

[0031] 1) Preparation of metal oxide thin films: select appropriate metal oxide-related raw materials, and use common physical and chemical preparation methods (sol-gel method / electrochemical deposition method / hydrothermal method / sputtering method, etc.) to obtain transparent metal oxides. Oxide film;

[0032] 2) Preparation of aqueous zinc ion electrolyte: dissolving zinc chloride powders of different masses in aqueous solution, stirring and dissolving at room temperature to obtain zinc chloride aqueous solutions with different mass molar concentrations;

[0033] 3) Preparation of the electrochromic device: encapsulating the transparent metal oxide film obtained in step 1) with a zinc chloride aqueous solution and zinc foil and silicon rubber to obtain an electrochromic device.

[0034] The concrete operation of described step 1) is:

[0035] The selected electrochromic material is an inorganic metal oxide capable of reversible intercalation and deintercalation of zinc ions,...

Embodiment 1

[0040] The high-concentration zinc ion electrolyte of the present invention and the electrochromic device comprising it comprise the following steps:

[0041] 1) Preparation of metal oxide film: using tungstic acid as the reaction raw material, using sol-gel method, spin-coating or brush-coating tungsten oxide precursor sol on a transparent conductive substrate, and performing carbonization-annealing treatment to obtain a transparent tungsten oxide film ;

[0042] 2) Preparation of water-based zinc ion electrolyte: Add 27.26g of zinc chloride powder into 10ml of water, stir and dissolve at room temperature to form a high-concentration water-based zinc chloride electrolyte, and the molar concentration of the electrolyte is 20mol / kg;

[0043] 3) Preparation of the electrochromic device: encapsulating the transparent tungsten oxide film obtained in step 1) with a zinc chloride aqueous solution, zinc foil and silicon rubber to obtain an electrochromic device.

[0044] The concret...

Embodiment 2

[0051] The high-concentration zinc ion electrolyte of the present invention and the electrochromic device comprising it comprise the following steps:

[0052] 1) Preparation of metal oxide thin film: take tungsten powder as reaction raw material, and hydrogen peroxide (H 2 o 2 ) After the reaction in an ice bath, the supernatant obtained by ultrasonic filtration is used as a precursor sol, which is spin-coated on a transparent conductive substrate by a sol-gel method and subjected to a subsequent annealing process to obtain a transparent tungsten oxide film;

[0053] 2) Preparation of aqueous zinc chloride electrolyte: 10.904 g of zinc chloride powder was added to 10 ml of deionized water, stirred and dissolved at room temperature to form a high-concentration aqueous zinc chloride electrolyte with a mass molar concentration of 8 mol / kg.

[0054] 3) Preparation of the electrochromic device: encapsulating the transparent metal oxide film obtained in step 1) with a zinc chloride a...

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Abstract

The invention discloses a high-concentration aqueous zinc ion electrolyte, an electrochromic device containing the electrolyte and a method. The mass molar concentration of a zinc chloride aqueous solution is controlled to be 8 to 31 mol / kg. Under the electrolyte system, electrolyte salt and water molecules are subjected to solvation, the activity of free water molecules is reduced, an electrochemical window is widened to 2.4 V, the decoloration voltage of the electrochromic device can be improved, and the electron deintercalation rate of an electrochromic reaction is further improved; side reaction of free water is inhibited, and electrochemical stability of the device is improved; and high concentration and high characteristic guarantee excellent open-circuit memory effect. Therefore, the electrochromic device taking tungsten oxide and other transparent metal oxide films as the electrochromic layer, the metal zinc foil as the counter electrode and the high-concentration aqueous zinc chloride solution as the electrolyte is excellent in comprehensive performance, and has high coloring / decoloring response speed, good cycle stability and open-circuit memory effect.

Description

technical field [0001] The invention belongs to the technical field of electrochromism, and in particular relates to a high-concentration water system zinc ion electrolyte and an electrochromic device and method containing the electrolyte. Background technique [0002] Electrochromism refers to the reversible change of optical properties (absorption, transmittance or reflectance) of electrochromic materials driven by an external electric field. Electrochromic devices based on aqueous Zn-ion electrolytes have attracted widespread attention due to their advantages of low cost, safety, and variety. However, the electrochemical activity of aqueous zinc-ion electrolytes is limited by the narrow electrochemical window of water (1.23V), and the side reactions between zinc ions and free water molecules will affect the deintercalation of zinc ions in electrochromic materials, further affecting The electrochemical stability of electrochromic devices, thereby affecting the electrochro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1523
CPCG02F1/1525
Inventor 方华靖武文婷汪宏
Owner XI AN JIAOTONG UNIV
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