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A kind of porous silicon/graphene composite material and its preparation method and application

A technology of composite materials and porous silicon, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as poor electronic conductivity and severe volume effect

Active Publication Date: 2021-04-30
GUANGDONG DONGDAO NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts the in-situ solid-phase synthesis method, which mainly aims at bottleneck problems such as poor electronic conductivity and severe volume effect in the cycle process when silicon material is used as the negative electrode. Novel porous silicon / graphene composites with Coulombic efficiency and good cycle performance

Method used

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  • A kind of porous silicon/graphene composite material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 1. 1L mass fraction of 5.4% Ca(OH) 2 Add the suspension into the reaction vessel, stir the suspension at a rotation speed of 300r / min, add 1.5g of SBA-15 particles after 10min, start the vacuum pump to make the vacuum of the reaction vessel reach -0.06MPa, and turn off the vacuum pump. After continuing to stir for 30 min, CO was introduced into the 2 gas, when H is 7, stop feeding the reaction gas, filter the suspension, and dry it under vacuum at 70°C for 6 hours to obtain a porous silica / calcium carbonate composite material.

[0062] 2. Mix 4 g of porous silica / calcium carbonate composite material with 1 g of polyacrylonitrile in 2 L of dimethyl sulfoxide (DMSO) solvent, and heat to remove the solvent to obtain an organic-coated porous silica / calcium carbonate composite material.

[0063] 3. Mix 1g of organic-coated porous silica / calcium carbonate composite material with 1g of magnesium powder, put it in the muffle furnace, first pass pure argon for 30min, and the fl...

Embodiment 2

[0066] 1. 1L mass fraction of 5.4% Ca(OH) 2 Add the suspension into the reaction vessel, stir the suspension at a rotation speed of 400r / min, add 2.5g of MCM-48 particles after 20min, start the vacuum pump to make the vacuum of the reaction vessel reach -0.06MPa, and turn off the vacuum pump. After continuing to stir for 40 min, CO 2 gas, when the pH is 6, stop feeding the reaction gas, filter the suspension, and dry it in a vacuum environment at 80°C for 7 hours to obtain a porous silica / calcium carbonate composite material.

[0067] 2. Mix 5g of porous silica / calcium carbonate composite with 1g of polyacrylonitrile in 2L nitrogen dimethylformamide (DMF) solvent, heat to remove solvent to obtain organic carbon-coated porous silica / calcium carbonate composite .

[0068] 3. Mix 1g of organic-coated porous silica / calcium carbonate composite material with 1g of magnesium powder, put it in the muffle furnace, first pass pure argon gas for 20min, the flow rate is 300ml / min, and r...

Embodiment 3

[0071] 1. 1L mass fraction of 5.4% Ca(OH) 2 Add the suspension into the reaction vessel, stir the suspension at a rotation speed of 400r / min, add 3.0g of purified diatomite particles after 20min, start the vacuum pump to make the vacuum of the reaction vessel reach -0.06MPa, and turn off the vacuum pump. After continuing to stir for 40 min, CO 2 gas, when the pH is 8, stop feeding the reaction gas, filter the suspension, and dry it in a vacuum environment at 80° C. for 5 hours to obtain a porous silica / calcium carbonate composite material.

[0072] 2. Mix 3 g of porous silica / calcium carbonate composite material with 1 g of polyacrylonitrile in 2 L of dimethylacetamide (DMAC) solvent, and remove the solvent by heating to obtain organic carbon-coated porous silica / calcium carbonate composite material.

[0073] 3. Mix 1g of organic-coated porous silica / calcium carbonate composite material with 1.1g of magnesium powder, place it in a muffle furnace, and feed pure argon for 30 mi...

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Abstract

The present invention provides a preparation method of porous silicon / graphene composite material. The method comprises the following steps: (1) mixing calcium hydroxide suspension with porous silica, and introducing a reaction gas for reaction to obtain porous silicon dioxide. Silicon oxide / calcium carbonate composite material; (2) mixing the composite material obtained in step (1) with a reducing agent to carry out thermal reduction reaction. The method provided by the invention can realize the doping of porous silicon and graphene in atomic size, and the prepared composite material has high initial capacity, initial Coulombic efficiency and good cycle performance when applied to the negative electrode of lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, and in particular relates to a porous silicon / graphene composite material and its preparation method and application. Background technique [0002] Lithium-ion batteries have a series of advantages such as high specific capacity, stable working voltage, good safety, and no memory effect, so they are widely used in many portable electronic devices such as notebook computers, mobile phones, and instruments. With the rapid development of various electronic devices and electric vehicles, people have higher and higher requirements on the energy and cycle life of lithium-ion batteries. The negative electrode material is an important part of the battery. Together with the positive electrode material, it determines the key performance of the lithium-ion battery, such as cycle life, capacity and safety, and has become the focus of research in various countries. At present, the speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCY02E60/10
Inventor 吴其修吴有铭叶雨佐史有利
Owner GUANGDONG DONGDAO NEW ENERGY
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