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Solid polymer electrolyte doped with modified nanofiller and preparation method of solid polymer electrolyte

A solid polymer and nanofiller technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of difficult thermal motion of polymer segments, limited practical applications, low ionic conductivity, etc., and achieve wide electrochemical stability. Window, promoting segment movement and ionic conduction, effect of high ionic conductivity

Active Publication Date: 2017-11-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since most of the polymer materials used as solid-state electrolyte matrix have high crystallinity, most of the complexes formed by polymer matrix and lithium salt are in the crystallization area at low temperature, which makes it difficult for polymer chain segments to undergo thermal movement. Therefore, the ionic conductivity of solid-state electrolyte The rate is low, and the interface performance is poor, which limits its practical application

Method used

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  • Solid polymer electrolyte doped with modified nanofiller and preparation method of solid polymer electrolyte
  • Solid polymer electrolyte doped with modified nanofiller and preparation method of solid polymer electrolyte
  • Solid polymer electrolyte doped with modified nanofiller and preparation method of solid polymer electrolyte

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Embodiment 1

[0034] This embodiment provides a solid polymer electrolyte mixed with a modified nanofiller, wherein the modified nanofiller is specifically a material in which silica nanoparticles are coated with dopamine and polyethyleneimine is grafted on the surface. The novel solid polymer electrolyte mixed with modified nanofillers is formed by mixing dopamine-coated silica nanoparticles, lithium salts, polyethylene oxide, polyethyleneimine and acetonitrile on the surface and drying them. film is prepared. Wherein, the content of dopamine-coated silica nanoparticles grafted with polyethyleneimine on the surface is: 0.5%, the content of lithium salt is 1%, the content of polyethylene oxide is 4%, and the content of polyethyleneimine is 1%. %, the content of acetonitrile is 93.5%.

[0035] Electrochemical tests show that the solid polymer electrolyte has good ionic conductivity and electrochemical stability: the ionic conductivity can be as high as 5.25×10 -5 S / cm, the electrochemical ...

Embodiment 2

[0049] This embodiment provides a solid polymer electrolyte mixed with a modified nanofiller, wherein the modified nanofiller is specifically a material in which silica nanoparticles are coated with dopamine and polyethyleneimine is grafted on the surface. The novel solid polymer electrolyte mixed with modified nanofillers is made of dopamine-coated silica nanoparticles grafted with polyethyleneimine on the surface, lithium salt, polyethylene oxide, polyethyleneimine and acetone, mixed and dried. film is prepared. Among them, the content of dopamine-coated silica nanoparticles grafted with polyethyleneimine on the surface is 1%, the content of lithium salt is 1.5%, the content of polyethylene oxide is 5%, and the content of polyethyleneimine is 1.5%. , the content of acetone is 91%.

[0050] The preparation method of the solid polymer electrolyte mixed with modified nanofillers described in this example is as follows

[0051] Step 1: Dopamine-coated silica nanoparticles

[...

Embodiment 3

[0063] This embodiment provides a solid polymer electrolyte mixed with a modified nanofiller, wherein the modified nanofiller is specifically a material in which silica nanoparticles are coated with dopamine and polyethyleneimine is grafted on the surface. The novel solid polymer electrolyte mixed with modified nanofillers is composed of dopamine-coated silica nanoparticles, lithium salts, polyethylene oxide, polyethyleneimine and N,N-dihydrocarbons grafted on the surface of polyethyleneimine. Methylformamide is mixed and dried to form a film. Among them, the content of dopamine-coated silica nanoparticles grafted with polyethyleneimine on the surface is: 0.8%, the content of lithium salt is 1.2%, the content of polyethylene oxide is 4.5%, and the content of polyethyleneimine is 1.3%. %, the content of N,N-dimethylformamide is 92.2%.

[0064] figure 1 It is a schematic flowchart of a method for manufacturing a solid polymer electrolyte according to an embodiment of the prese...

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Abstract

The invention provides a solid polymer electrolyte doped with modified nanofiller and a preparation method of the solid polymer electrolyte and belongs to the technical field of solid polymer electrolyte materials. The novel solid polymer electrolyte doped with modified nanofiller is prepared by mixing dopamine coated silicon dioxide nanoparticles grafted with polyethylenimine on the surfaces, lithium salt, polyoxyethylene, polyethylenimine and an organic solvent capable of dissolving polyethylene oxide and then drying the mixture for film formation. The preparation method comprises the steps as follows: preparing the dopamine coated silicon dioxide nanoparticles, grafting the particles with polyethylenimine on the surfaces, preparing an electrolyte mixed solution and preparing an electrolyte film. The preparation technology is simple, high in efficiency and low in production cost, and the prepared solid polymer electrolyte for lithium ion batteries has better thermal stability and mechanical strength as well as excellent safety performance and has very bright market prospects.

Description

technical field [0001] The invention belongs to the technical field of solid polymer electrolyte materials, and in particular relates to a solid polymer electrolyte mixed with modified nano fillers and a preparation method thereof. Background technique [0002] Since the 1960s and 1970s, people have been researching and developing lithium-ion batteries. Lithium-ion batteries have the characteristics of high specific energy, high efficiency and long life. These unique properties make lithium-ion batteries the first choice for power sources in the consumer electronics market. However, with the development of lithium-ion battery technology, people continue to deepen research on flexible electronic products, clean energy, electric vehicles, etc., high-performance lithium-ion batteries not only need to store energy efficiently, but also need to be flexible, safe, lightweight quality, durability, etc. The electrolyte, which connects the two electrodes, plays an important role in...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 隋刚谭堾予朱明杨小平
Owner BEIJING UNIV OF CHEM TECH
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