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Porous silicon/carbon composite material and preparation method thereof

A carbon composite material and composite material technology, used in electrical components, battery electrodes, circuits, etc., can solve the problems of low silicon content and low specific capacity of silicon-carbon composite materials, and achieve high specific capacity, low cost, and high cycle stability. sexual effect

Active Publication Date: 2011-10-05
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN1891668A also reports the preparation of silicon-carbon composite materials, but the silicon-carbon composite materials prepared by this method have low silicon content, resulting in low specific capacity of silicon-carbon composite materials, and are nano or micro silicon powder and carbon composites. The present invention reports the preparation of a porous silicon / carbon composite with enhanced cycling stability and specific capacity

Method used

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  • Porous silicon/carbon composite material and preparation method thereof
  • Porous silicon/carbon composite material and preparation method thereof
  • Porous silicon/carbon composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First configure 120 milliliters of hydrochloric acid with a concentration of 2 mol / L, then add 4 grams of P123 to the configured hydrochloric acid solution, then stir at 40°C for 4 hours, then add 8 grams of tetraethyl orthosilicate dropwise, and continue stirring at 40°C for 12 Hours, then moved to a reaction kettle, kept at 100°C for 36 hours to make it fully hydrolyzed, and after natural cooling, the product was filtered, washed, and dried. Then heat treatment at 550° C. in air for 6 hours to burn off the P123 template to obtain porous rod-shaped silica. Mix and grind 1 gram of the prepared porous silica with 3 grams of magnesium powder, then heat it to 700°C for 3 hours under an argon protective atmosphere to reduce the porous silica, and then wash the product with dilute hydrochloric acid to remove the oxidation in the product. Magnesium and incompletely reacted metal magnesium are subsequently washed with deionized water and dried to obtain porous silicon. Mix 0....

Embodiment 2

[0029] First configure 120 ml of hydrochloric acid with a concentration of 2 mol / L, then add 4 grams of P123 to the configured hydrochloric acid solution, then stir at 40°C for 4 hours, then add 8 grams of tetraethyl orthosilicate dropwise, and continue stirring at 40°C for 24 Hours, then moved to the reaction kettle, kept at 100°C for 24 hours to make it fully hydrolyzed, after natural cooling, the product was filtered, washed and dried. Then heat treatment at 550° C. in air for 6 hours to burn off the P123 template to obtain porous rod-shaped silica. Mix and grind 1 gram of the prepared porous silica and 2 grams of magnesium powder, then heat it at 700°C for 4 hours under an argon protective atmosphere to reduce the porous silica, and then wash the product with dilute hydrochloric acid to remove the oxidation in the product. Magnesium and incompletely reacted metal magnesium are subsequently washed with deionized water and dried to obtain porous silicon. Mix 0.5 gram of pre...

Embodiment 3

[0032] First prepare 120 ml of hydrochloric acid with a concentration of 2 mol / L, then add 4 grams of P123 to the prepared hydrochloric acid solution, then stir at 40°C for 4 hours, then add 8 grams of tetraethyl orthosilicate dropwise, and continue stirring at 40°C for 24 hours , and then moved to a reaction kettle, kept at 100°C for 24 hours to make it fully hydrolyzed, and after natural cooling, the product was filtered, washed, and dried. Then heat treatment at 550° C. in air for 6 hours to burn off the P123 template to obtain porous rod-shaped silica. Mix and grind 1 gram of the prepared porous silica with 2 grams of magnesium powder, then heat at 650°C for 6 hours under an argon protective atmosphere to reduce the porous silica, and then wash the product with dilute hydrochloric acid to remove the oxidation in the product. Magnesium and incompletely reacted metal magnesium are subsequently washed with deionized water and dried to obtain porous silicon. 0.5 g of prepared...

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Abstract

The invention discloses a porous silicon / carbon composite material and a preparation method thereof, and belongs to the fields of electrochemistry and new energy materials. The method comprises the following steps of: preparing porous silicon dioxide by using ethyl orthosilicate, silicon tetrachloride, methyl silicone oil and sodium silicide as raw materials, reducing the porous silicon dioxide into porous silicon, coating the porous silicon by adopting an organic carbon source, and performing thermal treatment under an inert atmosphere to prepare the porous silicon / carbon composite material. The material can be directly used as the lithium ion battery cathode material, the first discharge specific capacity of the material can reach 1,245mAh / g, the specific capacity can also reach 1,230mAh / g after 30 cycles, and the material has excellent charge / discharge performance.

Description

technical field [0001] The invention relates to a porous silicon / carbon composite material with high specific capacity and cycle stability and a preparation method thereof, which is used as a lithium-ion battery negative electrode material and belongs to the field of lithium-ion batteries. Background technique [0002] With the extensive development and rapid application of various portable electronic devices and electric vehicles, the demand for chemical power sources has increased sharply, and batteries are becoming more and more important. Compared with other battery systems, lithium-ion batteries have excellent electrochemical performance. Electrode materials are the main factors affecting battery performance and cost. Research and development of electrode materials are of great significance to the development of lithium batteries. At present, commercial lithium-ion batteries generally use mesocarbon microspheres and modified graphite as anode materials, but there are di...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/1395
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 范丽珍陶华超
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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