Composite solid polymer electrolyte and preparation method thereof

A solid polymer and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problem of limited ion conductivity, and achieve the effect of improving ion conductivity, reducing crystallinity, and small size

Active Publication Date: 2016-11-16
湖南国拓新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a composite solid polymer electrolyte and its preparation method, which can effectively solve the problem of limited ion conductivity in the electrolyte and improve the ion conductivity of the electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepare as follows:

[0024] (I) Mix 8g of sodium hydroxide and 40ml of acetone and stir for 1 hour, then stop stirring, and place the mixed solution in a dry environment to react at room temperature for 5 days; then add an appropriate amount of 1mol / L dilute Hydrochloric acid, adjust the pH value of the solution to 7, then perform ultrasonic dispersion, centrifugal separation, and deionized water washing for 5 times, and finally vacuum dry at 100°C for 12 hours to obtain carbon quantum dot solids with an average diameter of 3 to 5 nm;

[0025] (II) The carbon quantum dots prepared in the first step, polyoxyethylene and lithium perchlorate with a molecular weight of 600,000g / mol were dissolved in acetonitrile solution, stirred at room temperature for 12 hours, and poured into a polytetrafluoroethylene mold, controlled The amount of the mixed solution poured in the mold, the composite solid electrolyte obtained by vacuum drying, the thickness is 100 μm; wherein the molar...

Embodiment 2

[0029] Prepare as follows:

[0030] (I) Mix 8g of sodium hydroxide and 40ml of 40% aqueous solution of acetaldehyde and stir for 1 hour, then stop stirring, and place the mixed solution in a dry environment to react at room temperature for 5 days; then add An appropriate amount of 1mol / L dilute hydrochloric acid, adjust the pH value of the solution to 7, then perform ultrasonic dispersion, centrifugal separation, and deionized water washing 5 times, and finally vacuum dry at 100°C for 12 hours to obtain carbon with an average diameter of 3-5nm quantum dot solid;

[0031] (II) The carbon quantum dots prepared in the first step, polyoxyethylene and sodium perchlorate with a molecular weight of 600,000g / mol were dissolved in acetonitrile solution, stirred at room temperature for 12 hours and poured into a polytetrafluoroethylene mold, controlled The amount of the mixed solution poured into the mold was vacuum-dried to obtain a composite solid electrolyte with a thickness of 100 ...

Embodiment 3

[0035] Prepare as follows:

[0036] (I) Mix 6g of potassium hydroxide and 40ml of acetone and stir for 2 hours, then stop stirring, and place the mixed solution in a dry environment to react at room temperature for 3 days; then add an appropriate amount of 1mol / L dilute Hydrochloric acid, adjust the pH value of the solution to 7, then perform ultrasonic dispersion, centrifugal separation, and deionized water washing for 5 times, and finally vacuum dry at 120°C for 12 hours to obtain carbon quantum dot solids with an average diameter of 3 to 5 nm;

[0037] (II) Dissolve the carbon quantum dots prepared in the first step, polyacrylonitrile with a molecular weight of 150,000 g / mol, and lithium bistrifluoromethanesulfonate imide in acetonitrile solution, stir at room temperature for 12 hours, and then cast on polytetrafluoroethylene In the vinyl mold, control the amount of the mixed solution poured into the mold, and obtain a composite solid electrolyte by vacuum drying, so that t...

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Abstract

The invention provides a composite solid polymer electrolyte and a preparation method thereof. The polymer electrolyte comprises a high-molecular polymer, carbon quantum dots and an organic lithium salt or organic sodium salt, wherein the high-molecular polymer is selected from one of polyoxyethylene, polyacrylonitrile or polymethyl methacrylate and the like. The preparation method comprises the steps of preparing the carbon quantum dots from organic ketone or organic aldehyde as a raw material and then compounding the carbon quantum dots and high-molecular polymer matrix and the organic lithium/ sodium salt. By the composite solid polymer electrolyte, a crystal phase of the polymer matrix in the electrolyte can be effectively reduced, the dissociation rate of the lithium/sodium salt is improved, and the electrochemical properties of the ionic conductivity and the like of the polymer electrolyte are significantly improved.

Description

technical field [0001] The invention relates to a polymer electrolyte and a preparation method, in particular to a lithium / sodium ion battery composite solid polymer electrolyte and a preparation method. Background technique [0002] Electrolyte is an essential part of lithium / sodium-ion batteries. It not only plays the role of ion transport between the positive and negative electrodes, but also plays an important role in battery specific energy density, safety, cycle stability, high rate performance and cost. It plays a vital role. [0003] The electrolytes currently used in traditional lithium / sodium-ion batteries are mostly organic liquid electrolytes. Since the liquid electrolyte contains organic solvents with low ignition point and low boiling point, the electrolyte is easy to burn and cause the battery to catch fire and explode under the condition of high current or battery overcharge. In addition, the organic liquid is also easy to leak, resulting in poor cycle perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0565Y02E60/10
Inventor 韦伟峰马骋冯昊宇
Owner 湖南国拓新能源科技有限公司
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