Solid polymer electrolyte added with graphene quantum dots and preparation method of solid polymer electrolyte

A graphene quantum dot, solid polymer technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as low ionic conductivity at room temperature, achieve high room temperature conductivity, good electrochemical and interface stability , prepare a simple effect

Active Publication Date: 2017-06-13
HARBIN INST OF TECH WUXI RES INST OF NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a serious problem of low room temperature ionic conductiv

Method used

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  • Solid polymer electrolyte added with graphene quantum dots and preparation method of solid polymer electrolyte

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Effect test

Embodiment 1

[0017] Example 1 Preparation of modified graphene quantum dots

[0018] Graphene quantum dots were prepared by hydrothermal method: 0.05 g graphene oxide was added to 40 mL concentrated nitric acid (2.6 mol / L), refluxed at 70 °C for 24 h, cooled to room temperature, adjusted to pH 7, and 0.22 μm micropores were used Membrane filtration removes large sheets of graphene oxide to obtain graphene quantum dot filtrate.

[0019] Add 0.1g PEG-NH to the graphene quantum dot filtrate 2 , reacted at 120°C for 72 h, cooled to room temperature, and dialyzed the solution with a dialysis bag (14,000 Da) for one week, then vacuum-dried after rotary evaporation to obtain modified graphene quantum dots.

Embodiment 2

[0020] Example 2 Preparation of modified graphene quantum dots

[0021] Add 30 mL of concentrated nitric acid and 10 mL of concentrated sulfuric acid to 0.1 g of graphene oxide, reflux at 120 °C for 24 h, adjust the pH to 7, filter through a 0.22 μm microporous membrane to obtain graphene quantum dot filtrate, and add catalyst EDC / NHS to react for 30 min , to activate the carboxyl groups on the graphene quantum dots, and then add 0.2 g PEG-NH 2 , reacted for 12 hours, and the solution was dialyzed with a dialysis bag (3,500Da) for one week. The product was concentrated by rotary evaporation and dried to obtain a solid powder.

[0022] EDC: 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride; NHS: N-hydroxysuccinimide; PEG: polyethylene glycol.

Embodiment 3

[0023] Example 3 Polymer electrolyte with 1% modified graphene quantum dots added

[0024] Mix 10g of polyethylene oxide, 2g of lithium perchlorate, 0.1g of modified graphene quantum dots, and 200g of solvent acetonitrile until the polyethylene oxide and lithium perchlorate are completely dissolved, then pour them into a mold to dry to form a film, vacuum After drying, a solid polymer electrolyte membrane is obtained.

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Abstract

The invention discloses solid polymer electrolyte added with graphene quantum dots. The solid polymer electrolyte contains the following components: lithium salt, modified graphene quantum dots and solid polyoxyethylene, wherein the lithium salt and the modified graphene quantum dots are dispersed into a matrix of solid polyoxyethylene, the use amount of the lithium salt is 8%-40% of the mass of solid polyoxyethylene, and the use amount of the graphene quantum dots is 1%-80% of the mass of solid polyoxyethylene. The solid polymer electrolyte is easy to prepare, high in room-temperature conductivity and good in electrochemical and interface stability.

Description

technical field [0001] The invention relates to a solid polymer electrolyte added with modified graphene quantum dots and a preparation method thereof. Background technique [0002] In recent years, with the development of electric vehicles and grid energy storage, people's demand for high-safety, high-energy-density power batteries and energy storage systems has become more and more urgent. Among commercial electrochemical energy storage devices, lithium-ion batteries are undoubtedly the best choice. Lithium-ion batteries are widely used due to their high energy density, high working voltage, long cycle life, low self-discharge rate, no memory effect, fast charging and discharging, and environmental friendliness. However, traditional liquid lithium-ion secondary batteries Contains a large amount of organic electrolyte, which has the disadvantages of being volatile, flammable, and explosive, and will cause major safety hazards. [0003] Compared with traditional liquid ele...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565Y02E60/10
Inventor 白永平赵彦彪安茂忠陈国荣白杨李卫东席丹殷晓芬
Owner HARBIN INST OF TECH WUXI RES INST OF NEW MATERIALS
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