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Preparation method of metal nano-particles coated with graphene modified conductive polymer gel

A technology of metal nanoparticles and conductive polymers, applied in circuits, electrical components, battery electrodes, etc., can solve problems affecting battery cycle performance, affecting electron transmission in electrode materials, low conductivity and mechanical properties, and achieving good electronic performance. Effects of ion transport capability, good cycling stability, good repeatability and stability

Active Publication Date: 2016-12-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although conductive polymer gel has many excellent properties, its electrical conductivity and mechanical properties are relatively low, which will affect the transport of electrons in electrode materials and affect the cycle performance of batteries.

Method used

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  • Preparation method of metal nano-particles coated with graphene modified conductive polymer gel
  • Preparation method of metal nano-particles coated with graphene modified conductive polymer gel
  • Preparation method of metal nano-particles coated with graphene modified conductive polymer gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 58mg of tin-nickel nanoparticles into 2mL of 1mg / mL graphene oxide aqueous solution, and ultrasonically disperse them evenly. Then, add 60 μL of phytic acid and 50 μL of pyrrole solution, stir and sonicate to disperse evenly. Finally, add 0.12g of ammonium persulfate to 1mL of distilled water, then add it to the solution prepared in the previous step, ultrasonicate for 30s and let it stand for 8min to make pyrrole polymerize completely, then wash with distilled water for 2-3 times, and then freeze Dry to prepare graphene-modified conductive polymer gel-coated tin-nickel nanoparticles.

[0028] The graphene-modified conductive polymer gel coated tin-nickel nanoparticles prepared in this example has a three-dimensional porous structure, the particles are scattered in the graphene sheet and the gel, and the polypyrrole gel is closely connected with the graphene sheet. The cycle stability of the material is poor, and the capacity drops to 300mAh / g after 100 cycles.

Embodiment 2

[0030] Add 70mg of tin-nickel nanoparticles into 1mL of 2mg / mL graphene oxide aqueous solution, and ultrasonically disperse them evenly. Then, add 70 μL of phytic acid and 60 μL of pyrrole solution, stir and sonicate to disperse evenly. Finally, add 0.13g of ammonium persulfate to 1mL of distilled water, then add it to the solution prepared in the previous step, and let it stand for 8 minutes after ultrasonication for 30s to complete the polymerization of pyrrole, then wash with distilled water for 2-3 times, and then freeze Dry to prepare graphene-modified conductive polymer gel-coated tin-nickel nanoparticles.

[0031] The graphene-modified conductive polymer gel coated tin-nickel nanoparticles prepared in this example has a three-dimensional porous structure, the particles are scattered in the graphene sheet and the gel, and the polypyrrole gel is closely connected with the graphene sheet. The cycle stability of the material is poor, and the capacity drops to 352mAh / g afte...

Embodiment 3

[0033] Add 65mg of tin-nickel nanoparticles into 2mL of 1mg / mL graphene oxide aqueous solution, and ultrasonically disperse them evenly. Then, add 50 μL of phytic acid and 50 μL of pyrrole solution, stir and sonicate to disperse evenly. Finally, add 0.12g of ammonium persulfate to 1mL of distilled water, then add it to the solution prepared in the previous step, ultrasonicate for 30s and let it stand for 15min to make pyrrole polymerize completely, then wash with distilled water for 2-3 times, and then freeze Dry to prepare the graphene-modified conductive polymer gel-coated tin-nickel nanoparticles.

[0034] The graphene-modified conductive polymer gel coated tin-nickel nanoparticles prepared in this example has a three-dimensional porous structure, the particles are scattered in the graphene sheet and the gel, and the polypyrrole gel is closely connected with the graphene sheet. The cycle stability of the material is poor, and the capacity drops to 269mAh / g after 100 cycles...

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Abstract

The invention relates to a preparation method of metal nano-particles coated with graphene modified conductive polymer gel. The method comprises the steps of firstly mixing tin-nickel nano-particles with oxidized graphene solution uniformly, then adding pyrrole, oxidizing agents and dopants, and after full reaction, cooling and drying samples, thus acquiring the metal nano-particles coated with graphene modified conductive polymer gel. The metal nano-particles coated with graphene modified conductive polymer gel prepared by the invention are of three-dimensional porous structures, the particles are uniformly distributed in graphene sheets and gel, and polypyrrole gel is tightly connected with the graphene sheets. An electrode prepared by using tin-nickel nano-particles coated with graphene modified conductive polymer gel has high cycling stability and long service life. Cycle performance of a battery can be improved by taking the tin-nickel nano-particles coated with graphene modified conductive polymer gel prepared according to the method of the invention as the negative electrode material, and a new research method is provided for solving a volume expansion problem caused by taking the tin-base material as the negative electrode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method and application of graphene-modified conductive polymer gel-coated metal nanoparticles. Background technique [0002] The new tin-based negative electrode active material has a high theoretical capacity, which can meet the development requirements of lithium-ion batteries for high power, miniaturization and high capacity. However, there are serious volume changes in the charging and discharging process of this type of material, which will lead to pulverization of the material, destroy the passivation film on the electrode surface and consume the electrolyte, seriously affecting the capacity and cycle performance of the electrode. In order to solve the above problems and realize the unity of high capacity and good cycle stability of the new electrode, it is very important to modify the electrode and design the microstructure. [0003] Conductive polymer gels are polymer materials that combine the excellent ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 许鑫华张丽芳王文静窦鹏
Owner TIANJIN UNIV
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