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A kind of preparation method of porous Si/C composite microsphere

A technology of composite microspheres and sodium alginate, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of needing electrospray equipment, increasing production costs, and low yield, and achieves the convenience of large-scale production and convenient operation , The effect of simple process

Active Publication Date: 2016-08-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires an electrospray apparatus, which has low yield and high energy consumption, which increases the production cost

Method used

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  • A kind of preparation method of porous Si/C composite microsphere
  • A kind of preparation method of porous Si/C composite microsphere
  • A kind of preparation method of porous Si/C composite microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Weigh 0.3 g of sodium alginate and 0.17 g of silicon powder into a beaker, add 60 mL of deionized water, stir magnetically to make it evenly dispersed, and weigh 1.2 g of Span 80 and dissolve it in 40 mL of isooctane Solution, weigh 0.09 g Tween 80 and dissolve in 2 mL aqueous solution, weigh 0.269 g CuCl 2 Dissolve in 2 mL of water. Transfer the Span 80 isooctane solution into a three-necked bottle, and under mechanical stirring at 500 rpm, drop in the sodium alginate solution dispersed with silicon, emulsify for 15 minutes, then drop in Tween 80 aqueous solution, and then continue to emulsify for 5 minutes. minutes, followed by dropwise addition of CuCl 2 aqueous solution to allow the gel to solidify for 15 minutes. The solidified product was centrifuged and washed 4 times with absolute ethanol to remove isooctane, the solidified product was placed in liquid nitrogen for instant freezing, and then moved to a freeze dryer to dry for 25 hours.

[0019] Spr...

Embodiment 2

[0023] Example 2: Weigh 0.3 g of sodium alginate and 0.2 g of silicon powder into a beaker, add 60 mL of deionized water, stir magnetically to make it evenly dispersed, and weigh 2.4 g of Span 80 and dissolve it in 60 mL of isooctane Solution, weigh 0.17 g Tween 80 and dissolve in 3 mL aqueous solution, weigh 0.269 g CuCl 2 Dissolve in 2.5 mL of water. Transfer the Span 80 isooctane solution into a three-necked bottle, and under mechanical stirring at 800 rpm, drop in the sodium alginate solution dispersed with silicon, emulsify for 20 minutes, then drop in the Tween 80 aqueous solution, and then continue to emulsify for 8 minutes, followed by dropwise addition of CuCl 2 aqueous solution to allow the gel to solidify for 20 minutes. The solidified product was centrifuged, washed 4 times with absolute ethanol to remove isooctane, and the solidified product was placed in liquid nitrogen for instant freezing, and then moved to a freeze dryer to dry for 20 hours.

[0024] Spread...

Embodiment 3

[0026] Example 3: Weigh 0.4 g of sodium alginate and 0.2 g of silicon powder into a beaker, add 60 mL of deionized water, stir magnetically to make it evenly dispersed, and weigh 2.4 g of Span 80 and dissolve it in 60 mL of isooctane Solution, weigh 0.17 g Tween 80 and dissolve it in 3 mL aqueous solution, weigh 0.538 g CuCl 2 Dissolve in 3 mL of water. Transfer the Span 80 isooctane solution into a three-necked bottle, and under mechanical stirring at 1000 rpm, drop in the sodium alginate solution dispersed with silicon, emulsify for 20 minutes, then drop in Tween 80 aqueous solution, and then continue to emulsify for 8 minutes, followed by dropwise addition of CuCl 2 aqueous solution to allow the gel to solidify for 20 minutes. The solidified product was centrifuged, washed 5 times with absolute ethanol to remove isooctane, the solidified product was placed in liquid nitrogen and frozen instantly, and then moved to a freeze dryer to dry for 28 hours.

[0027] Spread the a...

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Abstract

The invention relates to a preparation method of a porous Si / C composite microsphere, and belongs to the technical field of electrode materials for lithium ion batteries. The process comprises the following steps: using silicon-dispersed sodium alginate aqueous solution as a water phase, using isooctane solution, which is dissolved with an emulsifier, as an oil phase, emulsifying uniformly the water phase and the oil phase by stirring, then adding a coagulant for crosslinking gelation of sodium alginate droplets, then freeze drying, and finally carbonizing in the inert gas atmosphere to obtain the porous Si / C composite microsphere. The porous Si / C composite microsphere prepared by the method is used as cathode materials of the lithium ion batteries, and has good electrochemical cycling stability and rate capability. The preparation method has the advantages of no need of expensive equipment, simple process, convenient operation, and easy scale production.

Description

technical field [0001] The invention relates to a preparation method of porous Si / C composite microspheres, belonging to the technical field of lithium ion battery electrode materials. 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 for lithium-ion batteries, silicon has an incomparable capacity advantage over other materials (theoretical specific capacity is as high as 4200 mAh×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 contact with the current collector, resulting in a rapid decline in its cycle performance. At present, one of the methods to improve the performance of silicon-based negative e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38
CPCH01M4/364H01M4/38H01M10/0525Y02E60/10
Inventor 杨文胜茹亚超
Owner BEIJING UNIV OF CHEM TECH