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Porous silicon carbon composite microsphere with yolk-eggshell structure and preparation method therefor

A silicon-carbon composite, porous silicon technology, applied in structural parts, nanotechnology for materials and surface science, electrical components, etc., can solve the problems of insufficient silicon expansion space, poor structural stability, etc., to facilitate large-scale Production, guaranteed stability, low cost effect

Inactive Publication Date: 2014-01-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a porous silicon-carbon composite microsphere with egg yolk-eggshell structure and its preparation method, which solves the problem of poor structural stability of the material due to insufficient expansion space of silicon

Method used

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  • Porous silicon carbon composite microsphere with yolk-eggshell structure and preparation method therefor
  • Porous silicon carbon composite microsphere with yolk-eggshell structure and preparation method therefor
  • Porous silicon carbon composite microsphere with yolk-eggshell structure and preparation method therefor

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Effect test

Embodiment 1

[0022]Weigh 400mg of silica pellet powder with a diameter of 1000nm and disperse it in 200mL water to form a suspension, add trishydroxymethylaminomethane while stirring, and adjust the pH value of the suspension to 8; then weigh 400mg of P123, add Add it into the suspension, stir it magnetically to make it evenly dispersed; then weigh 800mg of dopamine, add it to the suspension, stir at room temperature for 12 hours; then wash with deionized water for 3 times to remove unreacted dopamine, and dry at 60°C for 12 hours Polydopamine-coated silica SiO can be obtained 2 The black precipitate of PDA; under the protection of nitrogen gas, the resulting black precipitate is heated to 400°C at a rate of 3°C / min and kept for 1 hour, then raised to 800°C at a rate of 5°C / min and kept for 5 hours. Porous carbon-coated silica SiO can be obtained 2 Black powder of mpC.

[0023] Put 500mg of the above carbonized black powder in 60mL of NaOH aqueous solution with a substance concentration ...

Embodiment 2

[0026] Weigh 400mg of silica pellet powder with a diameter of 900nm and disperse it in 133mL of water to form a suspension, add trishydroxymethylaminomethane while stirring, and adjust the pH value of the suspension to 9; then weigh 200mg of P123, add Add it into the suspension, stir it magnetically to disperse it evenly; then weigh 400mg of dopamine, add it to the suspension, stir at room temperature for 24 hours; then wash with deionized water for 4 times to remove unreacted dopamine, and dry at 70°C for 10 hours Polydopamine-coated silica SiO can be obtained 2 The black precipitate of PDA; under the protection of nitrogen gas, the resulting black precipitate was heated to 350°C at a rate of 2°C / min and kept for 2 hours, then raised to 850°C at a rate of 4°C / min and kept for 3 hours. Porous carbon-coated silica SiO can be obtained 2 Black powder of mpC.

[0027] Put 475mg of the above carbonized black powder in 60mL of NaOH aqueous solution with a substance concentration o...

Embodiment 3

[0030] Weigh 400mg of silicon dioxide pellets with a diameter of 1300nm and disperse them in 100mL of water to make a suspension, add trishydroxymethylaminomethane while stirring, and adjust the pH value of the suspension to 8; then weigh 100mg of P123, add to In the suspension, stir magnetically to make it evenly dispersed; then weigh 200 mg of dopamine, add it to the suspension, and stir at room temperature for 24 hours; then wash with deionized water for 5 times to remove unreacted dopamine, and dry at 80°C for 8 hours. Available polydopamine-coated silica SiO 2 The black precipitate of PDA; under the protection of nitrogen gas, the resulting black precipitate was heated to 400°C at a rate of 1°C / min and kept for 2 hours, then raised to 900°C at a rate of 5°C / min and kept for 4 hours. Porous carbon-coated silica SiO can be obtained 2 Black powder of mpC.

[0031] Put 450mg of the above carbonized black powder in 60mL of NaOH aqueous solution with a substance concentration...

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Abstract

The invention provides a porous silicon carbon composite microsphere with a yolk-eggshell structure and a preparation method therefor, and belongs to the lithium ion battery electrode material technology field. The porous silicon carbon composite microsphere takes a porous submicron silicon sphere mpSi as a core with a diameter of 400-900 nm, and takes porous carbon mpC as a shell with a thickness of 10-60 nm. The inner diameter of a cavity Void is 800-1400 nm. The composition of the silicon carbon composite microsphere can be described as mpSi@Void@mpC. In addition, In the preparation method, cheap silicon dioxide is taken as a silicon source, silicon dioxide is conversed into silicon materials with electrochemical activities through a magnesiothermic reduction method. The size of gaps can be regulated and controlled through control of etching conditions. The preparation method is advantaged in that the material structure can be controlled, the cost is low, the process is simple, and the composite microsphere is convenient for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and in particular relates to an egg yolk-eggshell structure porous silicon-carbon composite microsphere and a preparation method thereof. The egg yolk-eggshell structure porous silicon-carbon composite microsphere can be used as a lithium-ion battery Negative material. Background technique [0002] With the rapid development of electric vehicles, there is an increasingly urgent demand for high specific capacity, long cycle life and high safety power lithium-ion batteries. Among the anode materials of lithium-ion batteries, silicon has an incomparable capacity advantage (theoretical specific capacity is as high as 4200mAh·g) -1 ) and high security have been widely concerned by researchers. However, the volume expansion of the silicon-based negative electrode is as high as 300% during the cycle, which is easy to cause material pulverization and loss of electrical c...

Claims

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Application Information

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IPC IPC(8): H01M4/38B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/38H01M4/625H01M4/628Y02E60/10
Inventor 杨文胜茹亚超
Owner BEIJING UNIV OF CHEM TECH
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