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Composite solid electrolyte material and preparation method thereof, and all-solid state electrochromic device

A technology of solid electrolyte and electrolyte, which is applied in the direction of instruments, nonlinear optics, optics, etc., can solve the problems of lack of bonding performance between PEG electrolyte and substrate, affect the cycle stability and overall performance of the device, ignore the bonding performance, etc., and achieve improved Ionic conductivity and bonding performance, fast discoloration, good bonding performance

Active Publication Date: 2018-07-06
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the previous research on electrochromic solid electrolytes mainly focused on the improvement of electrical conductivity, while ignoring the bonding performance with the substrate, which in turn affected the cycle stability and overall performance of the device.
In an article published by Hailin Hu in the Journal of Solid State Electrochemistry in 2010, titanium isopropoxide was added to an acidic polyethylene glycol (PEG) solution to prepare a mixed solid electrolyte, but the cycle life of the electrochromic device assembled with it was only 1000 Second, part of the reason is that the PEG electrolyte lacks good adhesion to the substrate, so it is easily affected by the external environment during the cycle, resulting in poor stability.

Method used

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  • Composite solid electrolyte material and preparation method thereof, and all-solid state electrochromic device
  • Composite solid electrolyte material and preparation method thereof, and all-solid state electrochromic device
  • Composite solid electrolyte material and preparation method thereof, and all-solid state electrochromic device

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preparation example Construction

[0041] The present invention also provides a method for preparing the above-mentioned composite solid electrolyte material, comprising the following steps:

[0042] Mix the high-viscosity polymer with the porogen and then spin-coat to obtain a high-viscosity polymer porous membrane;

[0043] Mixing modified polyethylene glycol, transparent photocurable monomer, photoinitiator, lithium salt and low boiling point organic solvent to obtain polyethylene glycol prepolymer;

[0044] The polyethylene glycol prepolymer is filled into the pores of the high-viscosity polymer porous membrane, and after removing the low-boiling point organic solvent, it is cured by ultraviolet light to obtain a composite solid electrolyte material.

[0045] Wherein, the present invention has no special limitation on the sources of all raw materials, which can be commercially available or self-made.

[0046] After mixing the high-viscosity polymer and the porogen, spin-coat, and after drying, obtain a hig...

Embodiment 1

[0064] 1.1 Synthesis of PEG prepolymer and preparation of PEG electrolyte: take 8.88g isophorone diisocyanate (IPDI), 0.2g p-hydroxyanisole (MEHQ), 0.02g dibutyltin dilaurate (DBTDL) and add 150ml round In the bottom flask, place it in a 60°C oil bath and stir it magnetically until it is in a uniform solution state, add dropwise a mixture of 4.4ml of anhydrous hydroxyethyl acrylate (HEA) and 4.3ml of anhydrous methyl methacrylate (MMA) to react 1 hour; add a solution of 20 g of polyethylene glycol (PEG-1000) in 8.6 ml of methyl methacrylate (MMA) in batches and react for 1.5 hours. Immediately after the reaction, the round-bottomed flask was taken out, and the temperature was slowly lowered at room temperature to obtain a colorless or light yellow PEG-modified liquid. Take 4 g of this liquid, 0.08 g of 1-hydroxycyclohexyl phenyl ketone (HCPK, 2% of the above synthetic liquid), 6 g of 0.1M LiClO 4 / PC (30% of the PEG prepolymer) and 10g of acetonitrile (ACN, 50% of the PEG pre...

Embodiment 2

[0072] Embodiment 2 Comparison test of PVB solid electrolyte with different concentrations

[0073] 2.1 Synthesis of PEG prepolymer:

[0074] Same as the synthesis of the PEG prepolymer in Example 1.

[0075] 2.2 Preparation of PVB porous membrane:

[0076] The preparation of PVB porous film: get chromatographic grade tetrahydrofuran (THF) and dimethyl sulfoxide (DMSO) to prepare mixed solvent according to volume ratio 9:1, get 7wt%, 12wt%, 17wt% PVB solution (PVB is the quality of mixed solvent Fraction) was stirred to a homogeneous colorless liquid by magnetic force. Take 1.72×3.45cm 2 Indium tin oxide (ITO) glass was placed in the center of the coating apparatus, and a layer of PVB solution was dropped on it, and spin-coated under the conditions of 1000rpm and 20s to obtain PVB porous films with different concentrations, with a thickness of 6.7μm.

[0077] 2.3 Preparation of solid electrolyte:

[0078] The method is the same as the preparation of the composite solid el...

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Abstract

The invention provides a composite solid electrolyte material. The composite solid electrolyte material comprises a highly viscous polymer porous membrane, and a polyethylene glycol electrolyte fillerplaced in pores of the highly viscous polymer porous membrane; the polyethylene glycol electrolyte filler comprises modified polyethylene glycol, transparent photocurable resin and lithium salt. Compared with the prior art, according to the composite solid electrolyte material, the highly viscous polymer porous membrane is introduced into the composite solid electrolyte material, so that the bonding performance is good; the polyethylene glycol electrolyte filler with high conductivity is placed in the pores of the porous membrane, so that the composite solid electrolyte material has responsetime comparable to that of a liquid device, and the ionic conductivity and bonding performance of an electrolyte is significantly improved to further prolong the cycle life of an all solid state electrochromic device.

Description

technical field [0001] The invention belongs to the technical field of electrochromism, and in particular relates to a composite solid electrolyte material, a preparation method thereof, and an all-solid-state electrochromic device. Background technique [0002] In recent years, with the enhancement of people's awareness of energy saving and environmental protection, the use of energy-saving electrochromic windows (smart windows) in spaces such as buildings and vehicles has become a research hotspot. All-solid-state smart windows are favored by people because of their practicability and operability. This kind of smart window is mainly composed of all-solid-state electrochromic devices and auxiliary circuits, and its transmittance (reflection) can be manually adjusted in a certain band. [0003] Solid electrolyte is one of the key materials for all-solid-state electrochromic devices. It serves as the electrolyte and electrode separator in the device to provide the required co...

Claims

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Application Information

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IPC IPC(8): G02F1/153
CPCG02F1/153
Inventor 徐春叶汪文静管世安郑建明
Owner UNIV OF SCI & TECH OF CHINA
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