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A multi-core multi-shell hollow material encapsulating nanoparticles and its preparation method and application

A nanoparticle and metal nanoparticle technology, applied in the field of multi-core multi-shell hollow materials and their preparation, can solve the problems of short cycle life, low energy density, poor rate performance, etc., achieve good cycle stability and increase volume Effects of Capacity Density and High Energy Density

Active Publication Date: 2022-06-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Around these two aspects, researchers have carried out a lot of fruitful material design work, which has effectively improved the performance of this type of alloyed electrode material, but there are still problems such as short cycle life, poor rate performance and low energy density. , still cannot meet the actual commercial application requirements

Method used

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  • A multi-core multi-shell hollow material encapsulating nanoparticles and its preparation method and application
  • A multi-core multi-shell hollow material encapsulating nanoparticles and its preparation method and application
  • A multi-core multi-shell hollow material encapsulating nanoparticles and its preparation method and application

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preparation example Construction

[0079] The present invention provides a method for preparing a multi-core multi-shell hollow material encapsulating nanoparticles, the method comprising:

[0080] (a) The aqueous carbon source solution with a concentration of 0.1-6M is loaded into a hydrothermal reactor at 175-220 °C for 100-180 min, naturally cooled and filtered, and after 2-5 washes, the product is dried at 60-100 °C for 6-24 h to obtain a carbon sphere template;

[0081] (b) The carbon sphere template obtained in step (a) is dispersed in a metal salt solution at a concentration of 0.1-5 M to give the suspension. Wherein the metal salt solution is a combination of tin tetrachloride solution, stannous chloride solution, stannous sulfate solution, tin oxalate solution, stannous oxalate solution and stannous acetate solution, insulation adsorption at 20-60 ° C for 1-48h, the adsorbed mixture is filtered, washed with deionized water, methanol or ethanol for 2-5 times, dried at 60-100 ° C for 6-24h to obtain a solid p...

Embodiment 1

[0087] Preparation method for encapsulating nanoparticles multi-core multi-shell hollow material, the method comprising:

[0088] (1) The aqueous sucrose solution with a concentration of 1.5M was loaded into a reaction kettle at 200 °C for 135 min, naturally cooled and filtered, and washed 3 times by water, 3 times by ethanol, and the product was placed in a 60 °C oven to dry for 24 h to obtain a carbon sphere template with a diameter of 2.9 μm;

[0089] (2) Disperse 1 g of the carbon bulb template obtained in step (1) with 40 mL of SnCl at a concentration of 0.5 M 4 In the solution, ultrasonically disperse the carbon balls evenly, load them into a beaker, place them in a 40 °C water bath for 4h, filter the adsorbed water, wash it 3 times with deionized water, wash it three times with ethanol and then put it into a 60 °C oven to dry for 24h to obtain a solid precursor;

[0090] (3) The solid precursor obtained in step (2) is placed in a muffle furnace, heated to 550 °C at 2 °C / min...

Embodiment 2

[0095] Preparation method for encapsulating nanoparticles multi-core multi-shell hollow material, the method comprising:

[0096] (1) The aqueous sucrose solution with a concentration of 2.5M was loaded into a reactor at 180 °C for hydrothermal reaction for 150 min, naturally cooled and filtered, and washed 3 times by water, 3 times by ethanol, and the product was placed in a 60 °C oven to dry for 24 h to obtain a carbon pellet template with a diameter of 2.7 μm;

[0097] (2) Disperse 1 g of the carbon bulb template obtained in step (1) with 40 mL of SnCl at a concentration of 0.5 M 2 In the solution, the carbon balls are dispersed evenly by ultrasound, loaded into a beaker, placed in a 30 °C water bath for 6h, the adsorbed pumping filter, washed 3 times with deionized water, and the ethanol washed three times into a 60 °C oven to dry for 24 h to obtain a solid precursor;

[0098] (3) The solid precursor obtained in step (2) is placed in a muffle furnace, heated to 550 °C at 5 °C / ...

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Abstract

The invention relates to the technical field of functional materials, and relates to a multi-core multi-shell hollow material encapsulating nanoparticles, a preparation method and application thereof. The method comprises the following steps: 1) heating and reacting the carbon source aqueous solution to obtain a carbon sphere template; 2) dispersing the carbon sphere template obtained in step 1) in a metal salt solution to obtain a solid precursor; 3) obtaining a solid precursor in step 2). The solid precursor is roasted to obtain a hollow multi-shell metal oxide material; 4) the hollow multi-shell metal oxide material obtained in step 3) is dispersed in a tris buffer solution containing a dopamine monomer to obtain A composite material in which each shell layer of the metal oxide multi-shell layer is coated with a dopamine polymer; 5) the composite material obtained in step 4) is calcined at a high temperature in an inert protective atmosphere or under vacuum to obtain a multi-core multi-shell layer encapsulating nanoparticles hollow material. The material can maintain a specific capacity of 900mAh / g, far exceeding the performance of commercial nanoparticles of the same composition.

Description

Technical field [0001] The present invention relates to the technical field of functional materials, in particular, to a multi-core multi-shell hollow material encapsulating nanoparticles and a preparation method and application thereof. Background [0002] In recent years, with the continuous depletion of traditional fossil fuels (mainly including coal, oil and natural gas) and the environmental pollution and greenhouse effect problems caused by continuous use, some renewable clean energy such as wind, solar, and tidal energy have received more and more attention. Unlike traditional fuels, these clean energy sources have discontinuities, instabilities, and disadvantages that can only be used in energy sources during large-scale use. The secondary battery system of electrochemical energy storage is one of the important ways to achieve clean energy conversion and storage. Lithium-ion batteries play a very important role in the field of electrochemical energy storage due to their l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/42H01M4/62H01M10/0525B01J13/02B01J13/20B01J13/22B82Y30/00B82Y40/00
CPCH01M4/366H01M4/38H01M4/386H01M4/387H01M4/42H01M4/62H01M4/625H01M4/628H01M10/0525B01J13/20B01J13/22B01J13/02B82Y40/00B82Y30/00Y02E60/10
Inventor 王丹王江艳
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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