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Composite solid polymer electrolyte and preparation method thereof

A solid polymer and electrolyte technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve problems such as easy agglomeration and affecting electrolyte performance, and achieve good compatibility, wide electrochemical stability window, and high ion conductivity rate effect

Active Publication Date: 2020-07-14
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the compatibility between the inorganic filler and the polymer matrix needs to be improved, and the filler is prone to agglomeration in the polymer matrix, which affects the performance of the electrolyte.

Method used

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  • Composite solid polymer electrolyte and preparation method thereof
  • Composite solid polymer electrolyte and preparation method thereof
  • Composite solid polymer electrolyte and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Cyclic carbonate-modified nano-silica particles were prepared according to the following steps: 0.5g nano-silica particles were dispersed in 50mL of toluene solvent, and ultrasonically dispersed evenly: under stirring conditions, 0.2g of cyclic carbonate-modified Silane coupling agent (monomethyldichlorosilane substituted 4-ethyl-1,3-dioxolane-2-one), reacted at 120°C for 0.5 hours, and then centrifuged at 10000r / min , And washed with ethanol 3 times and dried at 80°C to obtain cyclic carbonate modified silica nanoparticles.

Embodiment 2

[0038] Cyclic carbonate-modified nano-silica particles were prepared according to the following steps: 0.5g nano-silica particles were dispersed in 20mL of ethanol solvent, and ultrasonically dispersed evenly: under stirring, 5g cyclic carbonate-modified silane was added Coupling agent (trimethoxysilane substituted 4-[(propoxy)methyl]-1,3-dioxolane-2-one), react at 30℃ for 12 hours, then at 10000r / min Centrifuge under the conditions of, and wash with ethanol 3 times, and dry at 80°C to obtain cyclic carbonate modified silica nanoparticles.

Embodiment 3

[0040] In an argon glove box, combine polyethylene oxide (PEO) with a mass ratio of 3:1:1, the cyclic carbonate-modified silica nanoparticles prepared in Example 1, and lithium perchlorate (LiClO). 4 ) Fully dissolve in acetonitrile, stir for 24 hours to obtain a uniform viscous solution, then cast the electrolyte mixture on a polytetrafluoroethylene plate, evaporate the solvent, and then dry it in a vacuum drying oven at 80°C for 48 hours. The thickness of the prepared solid polymer electrolyte membrane doped with nanofillers is about 160um, the electrochemical window is greater than 5.2V, and the ionic conductivity is 8.9×10 at 30°C. -6 S / cm.

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Abstract

The invention discloses a solid polymer electrolyte doped with a modified nano-filler 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 the modified nano-filler is prepared by mixing cyclic carbonate modified silicon dioxide nano-particles, lithium salt, polyoxyethylene and a solvent capable of dissolving polyoxyethylene, and then drying to form a film. The preparation method comprises the following steps: preparing cyclic carbonate modified silicon dioxide nanoparticles, preparing an electrolyte mixed solution and preparing an electrolyte film. The preparation method is simple in preparation process, high in efficiency and low in production cost, and the obtained solid polymer electrolyte of the lithium ion battery has relatively good ionic conductivity and mechanical strength, excellent safety performance and a very high market prospect.

Description

Technical field: [0001] The invention belongs to the technical field of solid polymer electrolyte materials, and specifically relates to a solid polymer electrolyte doped with modified nano-fillers and a preparation method thereof. Background technique: [0002] Lithium-ion battery electrolyte material refers to a material system that has excellent ion conductivity, while taking into account functional characteristics such as interface performance, electrochemical stability, thermal stability, safety, and mechanical properties. Currently, LiPF, which is widely used in commercial lithium-ion batteries 6 -Although carbonate-based electrolyte has high ionic conductivity and good wetting properties, it has the defects of being easy to burn, volatile and insufficient in oxidation resistance, which seriously restricts the further improvement of the safety and energy density of lithium-ion batteries. In comparison, the solid electrolyte material has no or only a small amount of liquid c...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0082Y02E60/10
Inventor 汪靖伦孙天霷韩冲宇唐子龙
Owner HUNAN UNIV OF SCI & TECH
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