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Nano porous silicon alloy material and preparation method thereof

A silicon alloy material, nanoporous technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as expensive, unsuitable for large-scale production, high temperature, etc., and achieve the effect of improving low activity

Inactive Publication Date: 2013-08-14
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 require the corrosion of highly toxic HF or high temperature, and the operation is complicated. Expensive, not suitable for large-scale production, which hinders the practical process of silicon anode materials

Method used

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  • Nano porous silicon alloy material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) A Si / Fe / Al ternary alloy with a thickness of 500 microns, a width of 20 cm, a length of 100 cm, a composition of Si atomic percentage of 5%, Fe atomic percentage of 5%, and Al atomic percentage of 90% The tablets were placed in 0.5 mol / L sodium hydroxide solution.

[0024] (2) Free corrosion for 0.1 hour at 80°C.

[0025] (3) Collect the corroded alloy flakes and wash them repeatedly with ultrapure water until the sodium hydroxide solution is completely washed away. Then, the nanoporous ferrosilicon alloy material is obtained by drying at room temperature.

Embodiment 2

[0027] (1) A Si / Ag / Al alloy sheet with a thickness of 100 microns, a width of 1 cm, a length of 2 cm, a composition of Si atomic percentage of 5%, Ag atomic percentage of 5%, and Al atomic percentage of 90% was placed. In 2mol / L sulfuric acid solution.

[0028] (2) Free corrosion for 24 hours at room temperature of 30°C.

[0029] (3) Collect the corroded alloy pieces and wash them repeatedly with ultrapure water until the sulfuric acid solution is completely washed away. Then air-dried at 25 ℃ to obtain nanoporous silicon-silver alloy material.

Embodiment 3

[0031] (1) A Si / Cu / Al ternary alloy with a thickness of 500 microns, a width of 20 cm, a length of 100 cm, a composition of 6 atomic percent Si, 6 atomic percent Cu, and 88 atomic percent Al The tablets were placed in a 1 mol / L hydrochloric acid solution.

[0032] (2) Free corrosion for 0.1 hour at 80°C.

[0033] (3) Collect the corroded alloy pieces and wash them repeatedly with ultrapure water until the hydrochloric acid solution is completely washed away. Then, the nanoporous silicon-copper alloy material was obtained by air-drying at 40°C.

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Abstract

The invention relates to a nano porous silicon alloy material and a preparation method thereof and provides a method for preparing a nano porous silicon alloy material by corroding multi-element alloy. As a nano-structured bulk material, the material prepared by using the method is high in performance and stability and is suitable for large-scale production. According to the technical scheme, the nano porous silicon alloy material comprise silicon and silver or one of 3d elements, wherein the 3d elements comprise Cu, Zn, Co, Ni and Fe; and the preparation method of the nano porous silicon alloy material is a free corrosion method. The nano porous silicon alloy material and the preparation method thereof have the beneficial effects that operation is simple, structural components are controllable and adjustable, yield is high, no target material loss is generated, and large-scale production is easily realized.

Description

technical field [0001] The invention relates to a novel bulk nanostructure material and a preparation method thereof, in particular to a nanoporous silicon alloy 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 specific capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 徐彩霞郝芹
Owner UNIV OF JINAN
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