Preparation method of PMMA / SN composite electrolyte for electrochromism

Abstract

The invention discloses a preparation method of a polymethyl methacrylate / succinonitrile (PMMA / SN) composite electrolyte for electrochromism. The method comprises the following steps: firstly, preparing a PMMA gel electrolyte by adopting a solution casting method, and adding SN with different proportions on the basis of preparing the PMMA gel electrolyte to prepare the PMMA / SN composite electrolyte. The PMMA / SN electrolyte electrochromic device obtained by the preparation method disclosed by the invention has good electrochromic performance. The preparation method provided by the invention is simple and easy to operate, has practical feasibility and is low in overall cost.

Description

Technical Field

[0001] The invention belongs to the technical field of electrochromic material preparation, and specifically relates to a method for preparing a PMMA / SN composite electrolyte for electrochromism. Background Art

[0002] The rapid economic development and the continuous improvement of science and technology have brought rich life experience to human beings, but it is also accompanied by huge energy consumption. Electrochromic materials have attracted widespread attention as an environmentally friendly and energy-saving material. The function of the electrolyte in the electrochromic system is to provide ionic connection and prevent direct electrical contact between electrodes. Electrolytes include liquid electrolytes, ceramic or inorganic solid electrolytes and polymer electrolytes. Polymer electrolytes have become a research hotspot due to their low cost, simple processing, good durability and high transparency. PMMA has many significant advantages as a matrix of polymer electrolytes: PMMA can effectively resist chemical degradation and extend the service life of the equipment; compared with some other polymers, the synthesis and use process of PMMA is relatively environmentally friendly, and it can be relatively easily degraded by the environment after decomposition. This feature helps to improve its application in sustainable development. For example, it has low conductivity, which can effectively reduce the internal resistance of the electrolyte and improve the efficiency and performance of energy storage devices. However, PMMA electrolytes still have defects, and their high crystallinity affects the ionic conductivity of the electrolyte. Researchers have improved the performance of PMMA electrolytes through blending, copolymerization and doping.

[0003] By adding plasticizers, the glass transition temperature of PMMA electrolytes can be reduced, so that the electrolyte still maintains good flexibility at high temperatures, reducing the risk of cracking and brittle fracture, and at the same time increasing the mobility of polymer chains, thereby improving the mobility of ions in the electrolyte. This means that ions can move more freely in the electrolyte, thereby improving the ionic conductivity of the electrolyte and improving the overall performance of the electrolyte and electrochromic devices. The researchers found that the molecular structure of SN enables it to be effectively embedded in the polymer chains of PMMA, significantly reducing the rigidity of the material and improving its flexibility. This plasticizing effect is usually more significant than other plasticizers, which helps to improve the processing and performance of the material. At the same time, it exhibits good chemical compatibility in the electrolyte system, can enhance the mobility of the polymer chain, promote the migration of ions, and effectively improve the flexibility and ionic conductivity of PMMA. Summary of the invention

[0004] In order to solve the above-mentioned problems of PMMA electrolyte in electrochromicity, the purpose of the present invention is to provide a method for preparing a PMMA / SN composite electrolyte, which can improve the performance of PMMA electrolyte electrochromic devices.

[0005] In order to achieve the above object, the preparation method of the PMMA / SN composite electrolyte provided by the present invention comprises the following steps performed in sequence:

[0006] (1) Stir a certain proportion of lithium perchlorate (LiClO4) and propylene carbonate (PC) until they are completely dissolved to prepare a LiClO4 / PC electrolyte for use. Weigh a portion of the LiClO4 / PC liquid electrolyte, add PMMA, acetonitrile (ACN) and DMF and stir until they are completely dissolved, add a certain proportion of SN and vacuum dry to obtain a PMMA / SN composite electrolyte with a mass ratio of 9:1.

[0007] (2) Stir a certain proportion of lithium perchlorate (LiClO4) and propylene carbonate (PC) until completely dissolved to prepare a LiClO4 / PC electrolyte for use. Weigh a portion of the LiClO4 / PC liquid electrolyte, add PMMA, acetonitrile (ACN) and DMF and stir until completely dissolved, add a certain proportion of SN and vacuum dry to obtain a PMMA / SN composite electrolyte with a mass ratio of 8:2.

[0008] (3) Stir a certain proportion of lithium perchlorate (LiClO4) and propylene carbonate (PC) until completely dissolved to prepare a LiClO4 / PC electrolyte for use. Weigh a portion of the LiClO4 / PC liquid electrolyte, add PMMA, acetonitrile (ACN) and DMF and stir until completely dissolved, add a certain proportion of SN and vacuum dry to obtain a PMMA / SN composite electrolyte with a mass ratio of 7:3.

[0009] In step (1), the concentration of LiClO4 / PC is 1-2 mol / L, 10-12 g of LiClO4 / PC liquid electrolyte is taken, the water bath heating temperature and stirring time are 70-90° C. and 1-3 h respectively, the vacuum drying temperature and time are 50-70° C. and 9-12 h respectively, the amount of PMMA is 8-9 g, the amount of acetonitrile (ACN) is 5-8 g, the amount of DMF is 1-5 g, and the amount of SN is 0.5N1 g.

[0010] In step (2), the concentration of LiClO4 / PC is 1-2 mol / L, 10-12 g of LiClO4 / PC liquid electrolyte is taken, the water bath heating temperature and stirring time are 70-90° C. and 1-3 h respectively, the vacuum drying temperature and time are 50-70° C. and 9-12 h respectively, the amount of PMMA used is 7-8 g, the amount of acetonitrile (ACN) used is 5-8 g, the amount of DMF used is 1-5 g, and the amount of SN used is 1-2 g.

[0011] In step (3), the concentration of LiClO4 / PC is 1-2 mol / L, 10-12 g of LiClO4 / PC liquid electrolyte is taken, the water bath heating temperature and stirring time are 70-90° C. and 1-3 h respectively, the vacuum drying temperature and time are 50-70° C. and 9-12 h respectively, the amount of PMMA is 6-7 g, the amount of acetonitrile (ACN) is 5-8 g, the amount of DMF is 1-5 g, and the amount of SN is 2-3 g respectively.

[0012] The preparation method of a PMMA / SN composite electrolyte for electrochromic change provided by the present invention has the following beneficial effects:

[0013] (1) The PMMA / SN composite electrolyte electrochromic device prepared by the present invention. After various tests, it was found that it exhibited good electrochromic performance.

[0014] (2) The preparation method provided by the present invention is simple and easy to operate, has practical feasibility, and the prepared PMMA / SN composite electrolyte is low-cost and pollution-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : is the linear sweep voltammogram of the PMMA / SN composite electrolyte obtained in the example. DETAILED DESCRIPTION

[0016] The following examples can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way.

[0017] Example 1

[0018] A method for preparing a PMMA / SN composite electrolyte for electrochromism comprises the following steps:

[0019] (1) Stir a certain proportion of lithium perchlorate (LiClO4) and propylene carbonate (PC) until completely dissolved to prepare a 1 mol / L LiClO4 / PC electrolyte for use. Take 11.5 g of LiClO4 / PC liquid electrolyte, add 9 g of PMMA, 7.5 g of acetonitrile (ACN) and 5 g of DMF, stir at 70 ° C for 1 h until completely dissolved, vacuum dry at 50 ° C for 9 h, and add 1 g of SN to prepare a PMMA / SN composite electrolyte with a mass ratio of 9:1.

[0020] (2) Stir a certain proportion of lithium perchlorate (LiClO4) and propylene carbonate (PC) until completely dissolved to prepare a 1 mol / L LiClO4 / PC electrolyte for use. Take 11.5 g of LiClO4 / PC liquid electrolyte, add 8 g of PMMA, 7.5 g of acetonitrile (ACN) and 5 g of DMF, stir at 70 ° C for 1 h until completely dissolved, dry at 50 ° C in vacuum for 9 h, and add 2 g of SN to prepare a PMMA / SN composite electrolyte with a mass ratio of 8:2.

[0021] (3) Stir a certain proportion of lithium perchlorate (LiClO4) and propylene carbonate (PC) until completely dissolved to prepare a 1 mol / L LiClO4 / PC electrolyte for use. Take 11.5 g of LiClO4 / PC liquid electrolyte, add 1 g of PVDF, 7.5 g of acetonitrile (ACN) and 5 g of DMF, stir at 70 ° C for 1 h until completely dissolved, and vacuum dry at 50 ° C for 9 h. At the same time, add 3 g of SN to prepare a PMMA / SN composite electrolyte with a mass ratio of 7:3.

[0022] Example 2

[0023] A method for preparing a composite electrolyte with a mass ratio of PMMA / SN for electrochromism comprises the following steps:

[0024] (1) Stir a certain proportion of lithium perchlorate (LiClO4) and propylene carbonate (PC) until completely dissolved to prepare a 2 mol / L LiClO4 / PC electrolyte for use. Take 12 g of LiClO4 / PC liquid electrolyte, add 9 g of PMMA, 6.5 g of acetonitrile (ACN) and 5 g of DMF, stir at 80 ° C for 2 h until completely dissolved, vacuum dry at 60 ° C for 10 h, and add 1 g of SN to prepare a PMMA / SN composite electrolyte with a mass ratio of 9:1.

[0025] (2) Stir a certain proportion of lithium perchlorate (LiClO4) and propylene carbonate (PC) until completely dissolved to prepare a 2 mol / L LiClO4 / PC electrolyte for use. Take 12g of LiClO4 / PC liquid electrolyte, add 8g of PMMA, 6.5g of acetonitrile (ACN) and 5g of DMF, stir at 80℃ for 2h until completely dissolved, dry at 60℃ in vacuum for 10h, and add 2g of SN to prepare a PMMA / SN composite electrolyte with a mass ratio of 8:2.

[0026] (3) Stir a certain proportion of lithium perchlorate (LiClO4) and propylene carbonate (PC) until completely dissolved to prepare a 2 mol / L LiClO4 / PC electrolyte for use. Take 12g of LiClO4 / PC liquid electrolyte, add 7g PMMA, 6.5g acetonitrile (ACN) and 5g DMF, stir at 80℃ for 2h until completely dissolved, dry at 60℃ in vacuum for 10h, and add 3g SN to prepare a PMMA / SN composite electrolyte with a mass ratio of 7:3.

[0027] The present invention has been described in detail above through embodiments, but the contents described are only exemplary embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. The protection scope of the present invention is defined by the claims. Anyone who utilizes the technical solution described in the present invention, or a technician in the field, inspired by the technical solution of the present invention, designs a similar technical solution within the essence and protection scope of the present invention to achieve the above technical effects, or makes equal changes and improvements to the scope of application, shall still belong to the scope of protection covered by the patent of the present invention. It should be noted that in order to make a clear statement, the description of some components and processes that have no direct and obvious connection with the scope of protection of the present invention but are known to those skilled in the art are omitted in the description of the present invention.

Claims

1. A method for preparing a PMMA / SN composite electrolyte for electrochromic properties, characterized in that: The preparation method comprises the following steps in order: a certain proportion of lithium perchlorate (LiClO4) and propylene carbonate (PC) are stirred until completely dissolved to prepare a LiClO4 / PC electrolyte for use. A portion of the LiClO4 / PC liquid electrolyte is weighed, PMMA and acetonitrile (ACN) are added and stirred until completely dissolved, dimethylformamide (DMF) is added thereto, and a transparent gel-like substance is formed after stirring, and a certain proportion of SN is added to the above solution and stirred until completely dissolved to prepare a PMMA / SN composite electrolyte.

2. The method for preparing the PMMA / SN composite electrolyte for electrochromism according to claim 1, characterized in that: In step (1), the concentration of LiClO4 / PC is 1-2 mol / L, 10-12 g of LiClO4 / PC liquid electrolyte is taken, the water bath heating temperature and stirring time are 70-90° C. and 1-3 h respectively, the vacuum drying temperature and time are 50-70° C. and 9-12 h respectively, the amount of PMMA is 6-7 g, the amount of acetonitrile (ACN) is 5-8 g respectively, and the amount of SN is 2-3 g.

3. The method for preparing the PMMA / SN composite electrolyte for electrochromism according to claim 1, characterized in that: In step (2), the concentration of LiClO4 / PC is 1-2 mol / L, 10-12 g of LiClO4 / PC liquid electrolyte is taken, the water bath heating temperature and stirring time are 70-90° C. and 1-3 h respectively, the vacuum drying temperature and time are 50-70° C. and 9-12 h respectively, the amount of PMMA is 7-8 g, the amount of acetonitrile (ACN) is 5-8 g respectively, and the amount of SN is 1-2 g.

4. The method for preparing the PMMA / SN composite electrolyte for electrochromism according to claim 1, characterized in that: In step (3), the concentration of LiClO4 / PC is 1-2 mol / L, 10-12 g of LiClO4 / PC liquid electrolyte is taken, the water bath heating temperature and stirring time are 70-90° C. and 1-3 h respectively, the vacuum drying temperature and time are 50-70° C. and 9-12 h respectively, the amount of PMMA is 8-9 g, the amount of acetonitrile (ACN) is 5-8 g respectively, and the amount of SN is 0.5-1 g.

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