Nanoporous silicon/carbon composite material and preparation method thereof

A silicon-carbon composite material, nanoporous technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that hinder the practical process of silicon negative electrode materials, are not suitable for large-scale production, and are highly toxic Solve problems such as HF corrosion, achieve high performance, stability and conductivity, improve low activity, and facilitate operation

Inactive Publication Date: 2013-10-02
UNIV OF JINAN
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the current preparation methods of nanoporous silicon-based materials mainly include anodic oxidation, thermal reduction, template method, chemical vapor deposition, etc. These methods often re...

Method used

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  • Nanoporous silicon/carbon composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Place a Si / Al alloy sheet with a thickness of 100 microns, a width of 1 cm, and a length of 2 cm, with a composition of 10 atomic percent Si and 90 atomic percent Al in 1 mol / L sodium hydroxide in solution.

[0025] (2) Freely corrode for 24 hours at a room temperature of 25°C.

[0026] (3) Collect the corroded alloy pieces and wash them repeatedly with ultrapure water until the sodium hydroxide solution is completely washed away. Then dry at 25°C to obtain nanoporous silicon material. Its SEM photo see figure 1 , with a pore size of around 200 nm.

Embodiment 2

[0028] (1) Place a Si / C / Al alloy sheet with a thickness of 100 microns, a width of 1 cm, and a length of 2 cm, with a composition of 5 atomic percent Si, 5 atomic percent C, and 90 atomic percent Al. In 0.5 mol / L hydrochloric acid solution.

[0029] (2) Free corrosion for 48 hours at room temperature of 25°C.

[0030] (3) Collect the corroded alloy sheets and wash them repeatedly with ultrapure water until the hydrochloric acid solution is completely washed away. Then dry at 25 °C to obtain nanoporous Si / C composites.

Embodiment 3

[0032] (1) Place a Si / C / Al alloy sheet with a thickness of 100 microns, a width of 1 cm, and a length of 2 cm, with a composition of 10 atomic percent Si, 5 atomic percent C, and 85 atomic percent Al. in 1 mol / L sulfuric acid solution.

[0033] (2) Freely corrode for 24 hours at a room temperature of 25°C.

[0034] (3) Collect the corroded alloy pieces and wash them repeatedly with ultrapure water until the sulfuric acid solution is completely washed away. Then dry at 25 °C to obtain nanoporous Si / C composites.

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Abstract

The invention relates to a nanoporous silicon/carbon composite material and a preparation method thereof, and aims at providing a method of preparing the nanoporous silicon/carbon composite material through corrosion to a multicomponent alloy. The material prepared by the method can be used as a nano-structured bulk material, easily shows high performance and stability, and is suitable for large-scale production. The objective of the invention is to provide the nanoporous silicon/carbon composite material prepared by following technical schemes, and the preparation method employ a free corrosion method. The nanoporous silicon/carbon composite material and the preparation method have advantages of simple operation, controllable and adjustable structure and component, high yield, no target material loss, and suitability for large-scale production.

Description

technical field [0001] The invention relates to a novel bulk nanostructure material and a preparation method thereof, in particular to a nanoporous silicon-carbon composite material with controllable and adjustable structure and composition and a preparation method thereof, which can be used as a high-performance battery negative electrode active material. Background technique [0002] In the field of lithium-ion battery technology, the current commercial anode materials are mainly graphite-like carbon materials. However, the theoretical specific capacity of graphite is only 372mAh / g, which cannot meet the growing demand for high-energy storage power supplies. Moreover, the lithium intercalation platform potential of graphite is close to that of lithium, and "lithium separation" is prone to occur during fast charging or low-temperature charging, causing safety problems. Therefore, researchers have carried out extensive research to explore new anode materials with high specif...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/46B82Y30/00
CPCY02E60/10
Inventor 徐彩霞郝芹
Owner UNIV OF JINAN
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