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Method for preparing spongy porous silicon material

A porous silicon and sponge-like technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as the production method of sponge-like porous silicon materials that have not yet appeared, and achieve regular pore shape, improved performance, and uniform layout Effect

Inactive Publication Date: 2012-11-07
BAISHAN SHUNMAO TECH APPL MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition to the potential of being a positive electrode for lithium-ion batteries, the porous silicon material also has the potential of being a special sensor or catalyst material due to its unique material properties. Therefore, the prior art still needs to be further improved and developed for the production method and application of the sponge-like porous silicon material.

Method used

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  • Method for preparing spongy porous silicon material
  • Method for preparing spongy porous silicon material
  • Method for preparing spongy porous silicon material

Examples

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Embodiment 1

[0035] Purification of diatomite: Diatomite (silicon dioxide content between 80-90%) is soaked in sulfuric acid, nitric acid or hydrochloric acid for 5-10 hours to remove water-soluble impurities, and then mixed with ammonium sulfate at a ratio of 95-98% to 5 %-2% by weight and mixed evenly, at 400 ℃ - 600 ℃, calcined in air for 2 hours - 4 hours, after cooling, stir and filter with deionized water to remove water-soluble impurities, at 80 ℃ - 120 ℃ Dry to obtain purified diatomaceous earth.

[0036] Diatomite reduction: the purified diatomite and sodium, potassium, magnesium or calcium are directly reduced at a ratio of 25% or higher than the chemical equivalent in a protective gas of argon at 600°C-800°C at high temperature4 Hours to 6 hours, the reaction product is neutralized with hydrochloric acid aqueous solution, leached to remove sodium, potassium, magnesium or calcium chloride, filtered, washed with water, and dried at 80°C-120°C to obtain a high-purity sponge porous...

Embodiment 2

[0041] Purification of diatomite: Soak 600 grams of diatomite (silicon dioxide content between 80-90%) and 12000 grams with sulfuric acid, nitric acid or hydrochloric acid for 5-10 hours to remove water-soluble impurities, and then mix with 60 grams of sulfuric acid After the ammonium is mixed evenly, it is calcined in the air at 400 ℃ - 600 ℃ for 2 hours - 4 hours, after cooling, it is stirred with deionized water and filtered to remove water-soluble impurities, and dried at 80 ℃ - 120 ℃ to obtain purified diatoms earth.

[0042] Diatomaceous earth reduction: the purified diatomite and 900 grams of calcium are directly reduced in the protective gas of argon at 600 ° C to 800 ° C for 4 hours to 6 hours, and the reaction product is neutralized with hydrochloric acid aqueous solution, soaked Remove sodium, potassium, magnesium or calcium chloride, filter, wash with water, and dry at 80°C-120°C to obtain high-purity sponge-like porous silicon.

[0043] Taking calcium as a reduci...

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Abstract

The invention discloses a method for preparing a spongy porous silicon material. The procedure for purifying kieselguhr includes: fully soaking the kieselguhr through acid to remove water-soluble impurities in the kieselguhr, fully mixing the acidified kieselguhr and ammonium sulfate, fully calcining the mixture in the air, filtering the calcined kieselguhr through deionized water to remove impurities, and obtaining the purified deionized water after drying. The reduction process of the deionized water includes: enabling the purified kieselguhr and alkali family metals or alkali earth family metals to fully react under the environment of inert gases, fully soaking the reacted products through hydrochloric acid, and filtering, washing through water and drying to obtain the spongy porous silicon material with high purity. The obtained spongy porous silicon material with high purity can be applied to the industries of energy, semi-conductors, sensors and the like, is regular in pore shape, even in distribution and capable of reducing stress remarkably in application, and improves performance of the spongy porous silicon material.

Description

Technical field [0001] The present invention involves preparation methods for chemical batteries, sensors, catalyst and other fields, and especially involves a method for preparing sponge -shaped porous silicon materials. Background technique [0002] Silicon elements are the main elements of crustal composition. A large and wide distribution exist in nature, which is an element that is friendly to the environment.Due to the chemical characteristics of silicon, in nature does not exist in elements and integrates in a variety of silicate forms in the rocks.The industrial silicon oxides are widely used in building materials, ceramics, glass and electronic supplies. The oxide of the silicon is restored to polysilicon. The purified high -pure polysilicon is the most important raw material for the photovoltaic and semiconductor industry. [0003] Due to the chemical and electronic characteristics of silicon, silicon is used as an extremely examples of the secondary battery anode, whic...

Claims

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Application Information

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IPC IPC(8): C01B33/023
Inventor 吴以舜
Owner BAISHAN SHUNMAO TECH APPL MATERIAL