Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of carbon-coated tin dioxide nanoparticles

A technology of tin dioxide and nanoparticles, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of long reaction time, complex process, short cycle life, etc., and achieve composition and form Controllable, broad application prospects, good stability

Active Publication Date: 2021-01-26
SHANGHAI MARITIME UNIVERSITY
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, tin dioxide, as an anode material for lithium-ion batteries, has problems such as poor conductivity and significant volume expansion during charge and discharge, resulting in poor cycle performance and rate performance of the material.
The cycle performance of tin dioxide is poor resulting in a short cycle life
There are certain problems in these methods, such as: special requirements for equipment, complex process, long overall reaction time and high toxicity of organic precursors used
Moreover, generally, a layer of carbon material is coated on the surface of the prepared nanoparticles through the above-mentioned process. The existing technology cannot achieve one-step reaction to prepare carbon-coated nanoparticles with uniform morphology and structure.
Therefore, there is currently no low-temperature, high-efficiency, and high-yield method for preparing carbon-coated tin dioxide nanoparticles in the world, which limits its industrialization

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of carbon-coated tin dioxide nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The invention provides a method for preparing carbon-coated tin dioxide nanoparticles, which comprises the following steps:

[0027] Step 1: select an organotin compound and an oxidizing agent as raw materials, and mix the two evenly;

[0028] Step 2: adding a control agent to control the uniformity of the reaction and the morphology of the tin dioxide nanoparticles;

[0029] Step 3: heating and keeping the homogeneously mixed raw materials and control agent for a period of time;

[0030] Step 4: After cooling to room temperature, the product obtained in Step 3 is post-treated to obtain carbon-coated tin dioxide nanoparticles.

[0031] Preferably, the organic tin compound is a metal organic compound formed by the direct combination of tin and carbon elements.

[0032] Preferably, the organic tin compound is dimethyl tin dichloride, dimethyl tin oxide, dibutyl tin dichloride, tributyl tin chloride, dioctyl tin oxide, propenyl triphenyl tin or tetra One or more mixture...

Embodiment 1

[0042] 4.4 grams of dimethyl tin dichloride are uniformly mixed with 4.5 grams of 30% hydrogen peroxide, and 1.5 grams of oxalic acid are added, and the three are uniformly mixed and loaded into a pressure-dissolving bomb with a capacity of 200 milliliters of polytetrafluoroethylene lining and Lock seal. Heat the pressure melting bomb to 200°C, keep it warm for 1 hour and then cool to room temperature. The product obtained is cleaned with deionized water, dried and cleaned to obtain 2.5 grams of carbon-coated equiaxed tin dioxide nanoparticles, and its transmission electron microscope photo is as follows: figure 1 shown.

Embodiment 2

[0044] Mix 6.06 grams of dibutyltin dichloride and 9 grams of 30% hydrogen peroxide evenly, and add 1.5 grams of citric acid. After the three are evenly mixed, put them into a pressure-dissolving bomb with a capacity of 200 milliliters of polytetrafluoroethylene lining. Lock seal. Heat the pressure melting bomb to 200°C, keep it warm for 2 hours and then cool it to room temperature. The obtained product was washed with deionized water and dried to obtain 2.9 g of carbon-coated equiaxed tin dioxide nanoparticles.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of carbon-coated tin dioxide nanoparticles, which comprises the following steps: step 1: select an organic tin compound and an oxidizing agent as raw materials, and mix them uniformly; step 2: add a control agent for Control the uniformity of the reaction and the morphology of the tin dioxide nanoparticles; step 3: heat the uniformly mixed raw materials and the control agent and keep them warm for a period of time; step 4: after cooling to room temperature, the product obtained in step 3 is processed The treatment yields carbon-coated tin dioxide nanoparticles. The present invention can prepare carbon-coated tin dioxide nanoparticles through an oxidation process under low temperature conditions through the selection and proportioning of organic tin compounds, oxidants and control agents. The preparation method proposed by the invention has the characteristics of simple equipment, easy operation, low cost, etc., and is suitable for industrial production. Moreover, the prepared carbon-coated tin dioxide nanoparticles have controllable composition and morphology, good stability, and have broad application prospects in the field of lithium-ion batteries.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a preparation method of carbon-coated tin dioxide nanoparticles. Background technique [0002] Since the 21st century, due to the depletion of non-renewable fossil fuel resources such as coal, oil, and natural gas, and the environmental pollution caused by their combustion, the development of alternative energy and energy conservation and emission reduction have become the general trend. Lithium-ion secondary batteries, which are green and environmentally friendly batteries, have dominated the market for small portable batteries. The current commercial lithium-ion battery anode materials are usually carbon-based materials, such as graphite, mesocarbon microspheres, etc., and their specific capacity is relatively high. Low, and the structure is not stable enough to withstand high current charge and discharge, so although the current lithium-ion batteries have basically met the n...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/485H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 柯姝宇刘伯洋陶富军严胜昌文搏生
Owner SHANGHAI MARITIME UNIVERSITY