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Functional group linken on surface of polymer electrolyte nano SiO2 and preparation method thereof

A surface functional group and electrolyte technology, which is applied in the treatment of dyed low-molecular organic compounds, secondary battery parts, fibrous fillers, etc., can solve the problems of difficult to achieve reaction conditions, affect yield, and low yield, so as to improve electrical conductivity rate, reducing the effect of crystal phase content

Inactive Publication Date: 2007-10-03
杜洪彦 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this experiment is based on CH 3 CH 2 OH is a solvent, and the reaction conditions are difficult to meet the requirement of complete anhydrous, thus seriously affecting the yield
Hou once for SiO 2 The silanization reaction conditions of this new surface-bonded functional group have been beneficially explored [J.Hou.Ph.D thesis[D], Michigan State University, Michigan, 1997]. A series of characterization experiments have proved that the experiment has reached a certain level. effect, but the yield is relatively low

Method used

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  • Functional group linken on surface of polymer electrolyte nano SiO2 and preparation method thereof
  • Functional group linken on surface of polymer electrolyte nano SiO2 and preparation method thereof

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Embodiment 1

[0025] Embodiment 1. Get 10g of original sintered, particle size is 7~20nm, specific surface area is 380m 2 / g nano-SiO 2 , placed in a muffle furnace at 450°C for pre-burning for 24 hours, then transferred to 30ml of 5M HCl solution for pickling, and stirred at room temperature for 3 hours. The pickled SiO 2 Filter, wash, and dry under vacuum at 120°C for 12 hours. Weigh 5g of treated SiO 2 , placed in an airtight container under the protection of an inert gas, while adding 2g of silane coupling agent Cl 3 Si-CH 2 CH 2 (CF 2 ) 5 CF 3 and 0.5g catalyst HN(CH 3 ) 2 , and finally add 30ml CH 2 Cl 2 solvent. The mixture was stirred and heated at 45-55°C for 10-12 hours. After the reaction, the mixture was filtered in a fume hood, followed by CH 3 CH 2 OCH 2 CH 3 , anhydrous CH 3 CH 2OH wash. Then put the surface-modified nanoparticles into a vacuum oven and bake at 120°C. Figure 1 shows the nano-SiO 2 Diffuse reflectance infrared spectra before and after mo...

Embodiment 2

[0026] Embodiment 2. Weigh 0.7gPEO (weight average molecular weight~600,000, the same below), 0.2108gLiClO 4 , and then put them together in a dry round bottom flask, add 40ml of acetonitrile (CH3CN, HPLC) as a solvent, under the protection of an inert gas, control the temperature to 50 ° C, and stir for 60 hours. After the mixture becomes a sol, cast it on a polytetrafluoroethylene template, absorb the volatilized solvent with a 4 Å molecular sieve, transfer it to a vacuum drying oven after 24 hours, and continue drying at 60°C for 48 hours. This results in a dry, uniform, self-supporting pure polymer electrolyte membrane.

Embodiment 3

[0027] Embodiment 3. the original sintered nano-SiO before modification 2 Baked in vacuum at 120°C for 24 hours, weighed 0.09108g, mixed with 0.7gPEO, 0.2108g LiClO 4 Put them together into a dry round bottom flask, add 40ml of acetonitrile (CH3CN, HPLC) as a solvent, under the protection of an inert gas, control the temperature at 50°C, and stir for 60 hours. After the mixture becomes a sol, cast it on a polytetrafluoroethylene template, absorb the volatilized solvent with a 4 Å molecular sieve, transfer it to a vacuum drying oven after 24 hours, and continue drying at 60°C for 48 hours. This results in a dry, uniform, self-supporting composite polymer electrolyte membrane.

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Abstract

This invention relates to a kind of polymer dielectric nanometer SiO2 linkage upper surface functional group. It is hydrophobicity functional group with Si - CH2CH2( CF2) 5CF3 topcoated; the particle size of nanometer SiO2 is 7 to 20 nm, specific surface area is 150 to 300 sq m / g. Hydrophobicity quality of this invention is good for dispersing at PEO group polymer dielectric system, thereby could reduce crystalline phase content og this system, advance conductivity.

Description

technical field [0001] The present invention relates to a kind of nano SiO 2 The functional group on the bonded surface and its preparation method, and the composite polymer electrolyte for secondary lithium battery prepared by using it as filler. Background technique [0002] Lithium metal, as the negative electrode of secondary lithium battery, has a low redox potential (-3.05Vv.s.Li + / Li), low density (0.535g / cm 3 ), high specific capacity (3862mAh / g) and many other advantages, so metal lithium batteries will have higher specific energy and specific capacity than current lithium-ion batteries, but due to the low conductivity of the matching polymer electrolyte, so There is no mature product yet. [0003] There have been many reports about the solid polymer electrolyte used in metal lithium batteries, but its biggest deficiency is that the order of magnitude of conductivity at room temperature is only 10. -7 s / cm, which cannot meet actual needs at all. In order to im...

Claims

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Application Information

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IPC IPC(8): C09C3/08C09C1/28C08K9/04C08L71/00H01M10/02
CPCY02E60/10
Inventor 杜洪彦
Owner 杜洪彦
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