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A method for preparing nano-silicon anode materials by using waste silicon slag from the photovoltaic industry

A negative electrode material and nano-silicon technology, which is applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of high energy consumption, harsh environmental requirements, and low production efficiency of the plasma method, and achieve a widened production and sales chain and low cost. , the effect of increasing added value

Active Publication Date: 2019-10-15
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the plasma method still has disadvantages such as high energy consumption, harsh environmental requirements, low production efficiency, and low powder extraction rate.

Method used

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  • A method for preparing nano-silicon anode materials by using waste silicon slag from the photovoltaic industry
  • A method for preparing nano-silicon anode materials by using waste silicon slag from the photovoltaic industry
  • A method for preparing nano-silicon anode materials by using waste silicon slag from the photovoltaic industry

Examples

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Embodiment 1

[0032] The method for preparing nano-silicon anode material by utilizing waste silicon slag in the photovoltaic industry in this embodiment, the steps are as follows:

[0033] (1) Put the cutting waste silicon slag into the block crusher to obtain waste silicon with a particle size of less than 2 mm. Subsequently, 5 kg of crushed silicon waste was slowly immersed in 20 L of 1 M dilute hydrochloric acid at a stirring speed of 200 rpm at 50 °C for 70 min. Filter, then wash with deionized water until neutral, and dry in a vacuum drying oven at 120 °C until the moisture is less than 2%, to obtain waste silicon powder after primary purification;

[0034] (2) Put the waste silicon powder after primary purification into the block grinder, and crush the dried silicon powder to less than 2 mm. Then, put it into a horizontal tube furnace, first pass through Ar to purge for 10 min, then raise the temperature from room temperature to 700 °C at a rate of 5 °C / min, and keep it for 2 h to o...

Embodiment 2

[0041] The method for preparing nano-silicon anode material by utilizing waste silicon slag in the photovoltaic industry in this embodiment, the steps are as follows:

[0042] (1) Put the cutting waste silicon slag into the block crusher to obtain waste silicon with a particle size of less than 2 mm. Subsequently, 5 kg of crushed silicon waste was slowly immersed in 20 L of 1 M dilute sulfuric acid at a stirring speed of 200 rpm at 50 °C for 60 min. Filter, then wash with deionized water until neutral, and dry in a vacuum drying oven at 110 °C until the moisture is less than 2%, to obtain waste silicon powder after primary purification;

[0043] (2) Put the waste silicon powder after primary purification into the block grinder, and crush the dried silicon powder to less than 2 mm. Then, it was put into a horizontal tube furnace, first passed through Ar to purge for 10 min, then raised from room temperature to 700 °C at a rate of 5 °C / min, and kept for 2 h to obtain the second...

Embodiment 3

[0048] The method for preparing nano-silicon anode material by utilizing waste silicon slag in the photovoltaic industry in this embodiment, the steps are as follows:

[0049] (1) Put the cutting waste silicon slag into the block crusher to obtain waste silicon with a particle size of less than 2 mm. Subsequently, 5 kg of crushed silicon waste was slowly immersed in 20 L of 1 M dilute nitric acid at a stirring speed of 200 rpm at 50 °C for 50 min. Filter, then wash with deionized water until neutral, and dry in a vacuum oven at 100 °C until the moisture is less than 2%, to obtain a purified waste silicon powder;

[0050] (2) Put the waste silicon powder after primary purification into the block grinder, and crush the dried silicon powder to less than 2 mm. Then, it was put into a horizontal tube furnace, first passed through Ar to purge for 10 min, then raised from room temperature to 700 °C at a rate of 5 °C / min, and kept for 2 h to obtain the secondary purified silicon pin...

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Abstract

The invention discloses a method for preparing a nanometer silicon negative electrode material by using waste silicon slag of photovoltaic industry. The method comprises the following steps: crushingthe collected waste silicon slag to obtain waste silicon powder; By acid washing, water washing and drying, the waste silicon powder can be purified at one time. The waste silicon powder after primarypurification was pulverized to less than 2 mm, and then calcined in an inert atmosphere to achieve secondary purification. Subsequently, the nanometer silicon suspension is obtained through the treatment of the coarse powder and the fine powder; and the nanometer silicon negative electrode material can be obtained by spray drying the nanometer silicon suspension. The method is simple, low cost, and can be industrialized, and can realize the resource utilization of a large amount of silicon waste. The first discharge capacity of the nano-silicon anode material is as high as 3305 mAh / g, and thecoulombic efficiency is 88.5%, which is superior to that of the nanometer silicon negative electrode material on the market.

Description

technical field [0001] The invention relates to a method for reusing silicon waste, in particular to a method for preparing nano-silicon negative electrode materials for lithium-ion batteries by utilizing waste silicon slag in the photovoltaic industry. Background technique [0002] Energy transformation is a topic we cannot avoid, and solar energy is undoubtedly an important kind of renewable resources. In recent years, the photovoltaic industry has developed rapidly, and the annual installed capacity of new energy has gradually increased. Taking my country as an example, from 2015 to 2017, the annual newly installed capacity rose from 15.13 GW to 53.06 GW. Affected by national policies, it is expected to decline in 2018, and the newly installed capacity is expected to be around 30-35 GW. Behind the huge installed capacity, the production process of photovoltaic cells will be accompanied by the generation of a large amount of waste silicon slag. [0003] For these waste ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38
CPCH01M4/386Y02E60/10
Inventor 刘艳侠秦利娟刘凡张若涛刘福园张锁江阮晶晶
Owner 郑州中科新兴产业技术研究院
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