Novel enhancing impurities purification from silicon powder through metal-catalyzed chemical corrosion

Xi, Fengshuo; Cui, Hongqi; Li, Yuping; Ding, Zhao; Li, Shaoyuan; Ma, Wenhui; Chen, Xiuhua; Wei, Kuixian; Chen, Zhengjie; Lei, Yun; Wu, Jijun

doi:10.1016/j.powtec.2019.04.055

Cited by 7 publications

(8 citation statements)

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“…The above scheme is evaluated based on the "shrinking core model" [48] and "chemical reaction collision theory." [42] First, changing the concentration of HF will alter the reaction mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…The above scheme is evaluated based on the “shrinking core model” [ 48 ] and “chemical reaction collision theory.” [ 42 ] First, changing the concentration of HF will alter the reaction mechanism. When the concentration of HF is low, its diffusion rate to the surface of SiO 2 is quite slow, and the reaction is diffusion‐controlled.…”

Section: Resultsmentioning

confidence: 99%

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Silicon Cutting Waste Derived Silicon Nanosheets with Adjustable Native SiO₂ Shell for Highly‐Stable Lithiation/Delithiation

Zhou

et al. 2022

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storage devices since the 21st century, [7] and researchers have found that silicon (the theoretical capacity of forming Li 22 Si 5 :4200 mAh g −1 ) has the highest theoretical capacity among its known anode materials, more than ten times that of the current commercial graphite (the theoretical capacity of forming LiC 6 :372 mAh g −1 ) anode. [8][9][10] However, silicon anode has some defects, such as poor conductivity, large volume change (>300%) during lithiation/delithiation, repeated fragmentation and proliferation of solid electrolyte interphase film, and easy powdering of the electrode, which will lead to severe performance degradation. [11,12] To overcome these problems, researchers have proposed several solutions: shrinking the size of silicon to alleviate stress changes, [13] compounding with highly conductive materials to enhance conductivity, [14,15] designing porous structures of silicon to leave room for expansion of materials, [16] and adding inert phases to provide mechanical support. [17] In addition, there are some novel electrolytes [18] and binders [19] developed specifically for silicon to improve the overall performance of the battery. Nevertheless, in the practical application of silicon, there is still a very critical problem that is easily overlooked by most researchers: the preparation cost of silicon-based materials.First of all, the silicon sources for the preparation of siliconbased materials mainly include metallurgical silicon, silane (e.g., SiH 4 ), organosilicon (e.g., tetraethyl orthosilicate), silicate minerals (e.g., halloysite), biomass silicon (e.g., rice husk), silicon-based waste (e.g., waste glass), and commercial micro/ nano silicon, [20][21][22] which occupy a large part of the cost. Most of the sources are relatively expensive, and the cheap ones often undergo complex processing. Second, the preparation methods of silicon-based materials such as high-energy ball milling (HEBM), chemical vapor deposition (CVD), and metal thermal reduction are usually complicated, resulting in high energy consumption, long process, high cost, and low yield. [23,24] Therefore, based on the current preparation scheme, the preparation cost of silicon-based materials remains high, which makes its practical application difficult thus limits its commercialization process.The preparation of high-performance silicon-based materials from silicon-based waste is a good choice from the Silicon is an excellent candidate for the next generation of ultra-high performance anode materials, with the rapid iteration of the lithium-ion battery industry. High-quality silicon sources are the cornerstone of the development of silicon anodes, and silicon cutting waste (SCW) is one of them while still faces the problems of poor performance and unclear structure-activity relationship. Herein, a simple, efficient, and inexpensive purification method is implemented to reduce impurities in SCW and expose the morphology of nanosheets therein. Furthermore, HF is used to modulate the abundant native O in SCW after thermo...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Silicon Cutting Waste Derived Silicon Nanosheets with Adjustable Native SiO₂ Shell for Highly‐Stable Lithiation/Delithiation

Zhou

et al. 2022

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“…Based on the optimal concentration of single acid system leaching, a mixed acid solution of 1 M HCl + 4 M HF was prepared for the leaching experiments of waste silicon powder after high-temperature heat treatment. Additionally, 0.5 M H2O2 [33,34] was added to 4 M HF as the mixed acid The single acid leaching experiments revealed that the separate use of hydrochloric acid and hydrofluoric acid was insufficient to remove the main metal impurities from waste silicon powders. The effectiveness of the two leaching methods was compared, and it was found that HF leaching was more effective in removing impurities, particularly Fe, Cu, and Al.…”

Section: Mixed Acid System Leaching Experimentsmentioning

confidence: 99%

Purification of Organosilicon Waste Silicon Powder with Hydrometallurgy

Zhao

et al. 2023

Metals

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Waste silicon powder produced during the production process of organosilicon materials is a major environmental concern that can lead to pollution and resource wastage. As a result, it is crucial to find efficient ways of recovering and utilizing this waste material. In this study, the morphology of waste silicon powder was systematically studied, and an optimized purification method was proposed based on a hydrometallurgical process and phase analysis. The complex composition of waste silicon powder presents a significant challenge during its recycling. However, the results of this study showed that metal-assisted chemical etching (MACE), followed by mixed acid system leaching, is the most effective method for removing impurities from the material. The superior order of different acid systems for removing metallic impurities was HCl < HF < HF + HCl < HF + H2O2 < CuACE. It is worth noting that CuACE treatment has a remarkable ability to remove more than 95% of Fe through hydrometallurgy.

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“…Solar power, as a renewable energy source, has gained widespread attention due to its abundant supply and environmental sustainability . The polycrystalline silicon material plays a crucial role in the production of solar cells, converting solar energy into electricity with high efficiency. , Purification of solar-grade silicon into volatile liquids, such as trichlorosilane (TCS), is a common method crucial to the development of the solar industry. − Spouted bed reactors are commonly employed for the production of TCS due to the advantages of efficient gas–solid mixing, high heat and mass transfer efficiency, and effective temperature control. However, the complexity of the multiphase flow process and heat and mass transfer process in the reactor is intensified by the coupling of gas–solid flow and chemical reaction.…”

Section: Introductionmentioning

confidence: 99%

“…1 The polycrystalline silicon material plays a crucial role in the production of solar cells, converting solar energy into electricity with high efficiency. 2,3 Purification of solar-grade silicon into volatile liquids, such as trichlorosilane (TCS), is a common method crucial to the development of the solar industry. 4−6 Spouted bed reactors are commonly employed for the production of TCS due to the advantages of efficient gas−solid mixing, high heat and mass transfer efficiency, and effective temperature control.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of Solar-Grade Silicon Hydrochlorination to Trichlorosilane in a Gas–Solid Spouted Bed via the MP-PIC Method

Liu,

Yang,

et al. 2023

Ind. Eng. Chem. Res.

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The production of silicon is crucial for advancing the solar industry. This study employs the multiphase particle-in-cell technique to investigate the mechanism of heat and mass transfer between gas and solid phases during the trichlorosilane production process. The studied reactor is subjected to multiphysics analysis in three-dimensional space. Moreover, the effects of various operating conditions on the gas–solid flow and trichlorosilane production are fully explored. The simulation results are compared against the experimental data to confirm the reliability of the model. The results show that the annular regions exhibit low concentrations of silicon particles and heat transfer coefficients, whereas the spout regions exhibit high concentrations. The internal circulation of the reactor results in a symmetrical distribution of the axial mass fluxes of gases and particles. The axial dispersion coefficient of the silicon particle in the reactor significantly exceeds the radial dispersion coefficient. Furthermore, the wall temperature exerts an obvious effect on the distribution of silicon particle temperature compared to the inlet HCl flow rate and particle size. The three operating conditions have limited influence on the axial distribution of the heat transfer coefficient of silicon particles. Compared to the wall temperature, the HCl flow rate and silicon particle size have a greater impact on the production of SiHCl3.

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Novel enhancing impurities purification from silicon powder through metal-catalyzed chemical corrosion

Cited by 7 publications

References 51 publications

Silicon Cutting Waste Derived Silicon Nanosheets with Adjustable Native SiO₂ Shell for Highly‐Stable Lithiation/Delithiation

Silicon Cutting Waste Derived Silicon Nanosheets with Adjustable Native SiO₂ Shell for Highly‐Stable Lithiation/Delithiation

Purification of Organosilicon Waste Silicon Powder with Hydrometallurgy

Simulation Study of Solar-Grade Silicon Hydrochlorination to Trichlorosilane in a Gas–Solid Spouted Bed via the MP-PIC Method

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Novel enhancing impurities purification from silicon powder through metal-catalyzed chemical corrosion

Cited by 7 publications

References 51 publications

Silicon Cutting Waste Derived Silicon Nanosheets with Adjustable Native SiO2 Shell for Highly‐Stable Lithiation/Delithiation

Silicon Cutting Waste Derived Silicon Nanosheets with Adjustable Native SiO2 Shell for Highly‐Stable Lithiation/Delithiation

Purification of Organosilicon Waste Silicon Powder with Hydrometallurgy

Simulation Study of Solar-Grade Silicon Hydrochlorination to Trichlorosilane in a Gas–Solid Spouted Bed via the MP-PIC Method

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Silicon Cutting Waste Derived Silicon Nanosheets with Adjustable Native SiO₂ Shell for Highly‐Stable Lithiation/Delithiation

Silicon Cutting Waste Derived Silicon Nanosheets with Adjustable Native SiO₂ Shell for Highly‐Stable Lithiation/Delithiation