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Uniformly dispersed ultra-small metal nanoparticle material and dispersion method thereof

A technology of uniform dispersion of metal nanoparticles, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of electrode material electrochemical performance degradation, secondary agglomeration of nanoparticles, and high cost. Achieve the effect of facilitating ion transfer and electrolyte diffusion, preventing agglomeration, and improving utilization

Inactive Publication Date: 2020-08-18
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing dispersion technology process is often cumbersome, resulting in high cost. At the same time, the dispersed nanoparticles may have secondary agglomeration, which makes the electrochemical performance of the electrode material decline rapidly.

Method used

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  • Uniformly dispersed ultra-small metal nanoparticle material and dispersion method thereof
  • Uniformly dispersed ultra-small metal nanoparticle material and dispersion method thereof

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Embodiment 1

[0026] A method for uniformly dispersed ultra-small metal nanoparticles, comprising the following steps:

[0027] (1) Graphene oxide (GO) aqueous dispersion (1 mg / ml) was prepared by a modified Hummers method. Specific steps are as follows:

[0028] (1-1) A 250ml large beaker, put ice cubes in it, and provide an ice water bath;

[0029] (1-2) Measure 30ml of H in a test tube 2 SO 4 , then weigh 1g of graphite, 0.5g of sodium nitrate, and 3g of potassium permanganate with an electronic balance;

[0030] (1-3) Put the magnet into the Erlenmeyer flask, then gently pour the concentrated sulfuric acid into the Erlenmeyer flask, and then put it into the electromagnetic stirrer;

[0031] (1-4) Mix graphite and sodium nitrate into the conical flask, stir and react for three minutes, then add potassium permanganate to the conical flask, control the temperature below 20°C, stir and react for 2 hours; heat up to 35°C, continue Stir for 30 minutes;

[0032] (1-5) Mix water and disti...

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Abstract

The invention belongs to the technical field of electrode material preparation, and particularly relates to a uniformly dispersed ultra-small metal nanoparticle material and a dispersion method thereof. According to the present invention, the reduced graphene oxide is used as a substrate, and the uniformly dispersed ultra-small metal nanoparticle material is obtained through the freeze drying andcalcining processes. According to the invention, the ultra-small metal nanoparticles can be uniformly dispersed on the three-dimensional graphene porous foam substrate, the porous foam structure is beneficial to ion transfer and electrolyte diffusion, so that the utilization rate of the active material can be improved; the graphene substrate effectively prevents agglomeration among nanoparticles,the structural stability of the electrode material is kept, and the volume expansion of the active material in the charging and discharging process is relieved, so that the cycling stability of the electrode material is improved.

Description

Technical field: [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a uniformly dispersed ultra-small metal nano particle material and a dispersion method thereof. Background technique: [0002] Since the graphite negative electrode is an intercalation material, the theoretical specific capacity is low, which is not enough to meet people's demand for high energy density of lithium-ion batteries. Therefore, it is necessary to develop negative electrode materials with higher specific capacity. Metal-based alloys or conversion-reactive anode materials have attracted considerable attention in recent years due to their high theoretical capacities due to their alloying reactions during energy storage. However, the metal-based composites will have a large volume expansion during the process of lithium or sodium intercalation, which will cause the electrode material to pulverize, cause the active material to fall off f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525B82Y30/00
CPCH01M4/387H01M4/628H01M10/0525B82Y30/00H01M2004/027H01M2004/021Y02E60/10
Inventor 王晓君刘治明杨磊李海昌徐常蒙
Owner QINGDAO UNIV OF SCI & TECH
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