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A preparation method of silicon-based composite negative electrode material for lithium ion battery

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as environmental pollution and waste of resources, and achieve the effects of alleviating the effect of volume expansion, low cost, and improving cycle performance

Active Publication Date: 2017-12-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is not only a waste of resources, but also causes a certain degree of pollution to the environment.

Method used

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  • A preparation method of silicon-based composite negative electrode material for lithium ion battery
  • A preparation method of silicon-based composite negative electrode material for lithium ion battery

Examples

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Effect test

Embodiment 1

[0026] The method for preparing a silicon-based composite negative electrode material for a lithium ion battery of the present invention includes the following steps:

[0027] (1) In the process of using zircon sand with other chemical and mineral raw materials to produce zirconium chemical products, after the alkali melt or sintered material is treated, a large amount of silicon slag is produced in the process of acidification and silicon removal. Rotary drying at 110°C Dry, ultrasonically break, then add water and ammonium chloride to remove impurities to prepare silica sol; add NaOH to adjust the pH to 9.5, add a small amount of flocculant Al 2 (SO 4 ) 3 (Mass ratio SiO 2 : Al 2 (SO 4 ) 3 =1:0.06), increase the temperature to 85°C, add a small amount of polyethylene glycol (volume 10% of the total solvent volume, average molecular weight 200), stir for 60min, then stand for 30min, wash and centrifuge. The separated hydrated silica is calcined at 650℃ to obtain silica, which is ...

Embodiment 2

[0032] The method for preparing a silicon-based composite negative electrode material for a lithium ion battery of the present invention includes the following steps:

[0033] (1) In the process of using zircon sand with other chemical and mineral raw materials to produce zirconium chemical products, after the alkali melt or sintered material is treated, a large amount of silicon slag is produced in the acidification and desiliconization process. Rotary drying at 120℃ Dry, ultrasonically break, then add water and ammonium chloride to prepare silica sol; add NaOH to adjust the pH to 9.5, add a small amount of flocculant Al 2 (SO 4 ) 3 (Mass ratio SiO 2 : Al 2 (SO 4 ) 3 =1:0.06), increase the temperature to 85°C, add a small amount of polyethylene glycol (volume 10% of the total solvent volume, average molecular weight 200), stir for 60min, then stand for 30min, wash and centrifuge. The hydrated silica obtained after separation is calcined at 800°C to obtain silica, which is activat...

Embodiment 3

[0038] The method for preparing a silicon-based composite negative electrode material for a lithium ion battery of the present invention includes the following steps:

[0039] (1) In the process of using zircon sand with other chemical and mineral raw materials to produce zirconium chemical products, after the alkali melt or sintered material is treated, a large amount of silicon slag is produced in the process of acidification and desiliconization. Rotary drying at 130°C Dry, ultrasonically break, then add water and ammonium chloride to prepare silica sol; add NaOH to adjust the pH to 9.5, add a small amount of flocculant Al 2 (SO 4 ) 3 (Mass ratio SiO 2 : Al 2 (SO 4 ) 3 =1:0.06), increase the temperature to 85°C, add a small amount of polyethylene glycol (volume 10% of the total solvent volume, average molecular weight 200), stir for 60min, then stand for 30min, wash and centrifuge. The hydrated silica obtained after separation is calcined at 750°C to obtain silica, which is act...

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Abstract

The invention discloses a method for preparing a silicon-based composite anode material of a lithium ion battery. The method comprises the following steps: (1) drying and ultrasonically crushing silicon slag to prepare silicon dioxide hydrate, and calcining and ball milling the silicon dioxide hydrate to obtain nano silica; (2) uniformly mixing the nano silica with magnesium powder, heating the mixture in a sealed container in an inert atmosphere, carrying out metallothermic reduction, maintaining a constant temperature, cooling to the room temperature, sequentially washing the product with hydrochloric acid and deionized water, and separating to obtain a porous silicon / silicon oxide composite material, or sequentially washing the product with hydrochloric acid, deionized water, hydrofluoric acid and deionized water, and separating to obtain the porous silicon / silicon oxide composite material; (3) dispersing the composite material into a solution dissolved with a carbon source, ultrasonically dispersing, stirring uniformly to obtain a suspension, evaporating the suspension, and heating in the inert atmosphere to obtain the silicon-based composite anode material of the lithium ion battery. The silicon-based composite anode material of the lithium ion battery prepared by the method disclosed by the invention has the advantages of environmental protection, low cost and good electrochemical performance.

Description

Technical field [0001] The invention relates to the field of lithium ion battery negative electrode materials, in particular to a method for preparing a silicon-based composite negative electrode material. Background technique [0002] Lithium-ion batteries are widely used in various portable electronic devices and electric vehicles due to their advantages of high energy density, high working voltage, long service life, and easy portability. At present, commercial lithium ion secondary batteries generally use various carbon materials as negative electrodes, but due to their capacity limitations (372mAh / g), they gradually cannot meet the needs of high energy density batteries. Silicon-based materials are considered to be one of the most promising materials for improving the performance of lithium-ion battery anode materials because of their high theoretical capacity (3579mAh / g) at room temperature and low lithium deintercalation potential (0.02-0.6V vs. Li+ / Li). One. However, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38
CPCH01M4/466H01M4/48Y02E60/10
Inventor 郭华军周玉李新海王志兴周融彭文杰胡启阳
Owner CENT SOUTH UNIV
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