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Silica fume based silicon monoxide negative electrode material, preparation method thereof and lithium ion battery

A lithium-ion battery and silicon oxide technology, which is applied in the direction of silicon oxide, battery electrodes, secondary batteries, etc., can solve the problems of non-spherical shape, complex types of impurities, poor batch stability, etc., and achieve low price and high efficiency Effect of Recycling Market, Cost Reduction and Construction Price

Inactive Publication Date: 2019-10-22
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon waste for solar panels is a cheap elemental silicon material. Although it has the characteristics of being cheap, it has complex types of impurities, does not have a characteristic spherical shape, and has poor batch stability. Although it has been studied and explored for a long time , but it is unlikely that this silicon material will be directly used in the negative electrode of lithium-ion batteries

Method used

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  • Silica fume based silicon monoxide negative electrode material, preparation method thereof and lithium ion battery
  • Silica fume based silicon monoxide negative electrode material, preparation method thereof and lithium ion battery
  • Silica fume based silicon monoxide negative electrode material, preparation method thereof and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0029] Selecting magnesium powder as an example with reducing agent, the concrete method of the present embodiment is as follows:

[0030] (a) Choose silica fume powder with an average particle size of 120 nanometers as a raw material, with a purity of 98%, and impurities including iron oxide, magnesium oxide, calcium oxide and a small amount of carbon.

[0031] (b) Put the silica fume powder raw material into 0.1M HCl solution for high-speed stirring and washing for 1 hour, filter and wash with deionized water for 3 times until the solution is weakly acidic, and dry for later use.

[0032] (c) Grinding and mixing the acid-washed silicon fume powder raw material and magnesium powder according to the mass ratio of 1:0.8, under the protection of Ar atmosphere in the tube furnace, calcining at 650°C for 1h, and after partial reduction, SiO is obtained x Material.

[0033] (d) SiO will be obtained x Disperse the material into 0.05M HCl solution, react overnight under magnetic st...

Embodiment 2

[0035] Reductant is selected aluminum powder, and specific method is similar to embodiment 1, and difference is, after the silicon fume powder raw material after pickling and high-purity aluminum powder are ground and mixed according to the mass ratio of 1:0.6, in tube furnace Ar Under the protection of the atmosphere, calcined at 800 °C for 1.5 h to obtain partially reduced SiO x material, obtained SiO x Material dispersed to 0.1M HNO 3 In the solution, react overnight under magnetic stirring to further remove impurities and residual magnesium powder. After washing and centrifuging, dry at 120°C in vacuum to obtain high-purity and high-performance SiO x Negative material.

Embodiment 3

[0037] Reductant selects graphite carbon for use, and specific method is similar to embodiment 1, and difference is, after the silica fume powder raw material after pickling and the graphite powder of particle size 1 micron size are ground and mixed according to the mass ratio of 1:1, in Under the protection of Ar atmosphere in a tube furnace, calcined at 1200 ° C for 3 h to obtain partially reduced SiO x material, after natural cooling to 500°C, air was passed through for 3 hours to remove excess graphite carbon material to obtain high-purity and high-performance SiO x Negative material.

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Abstract

The invention discloses a preparation method of a silica fume based silicon monoxide negative electrode material. The preparation method includes the following steps: S1, selecting a spherical silicafume powder raw material having a SiO2 content of 90% or more and a particle diameter of 100-500 nm, and pickling impurities in the raw material to remove the impurities; S2, partially reducing the silica fume powder raw material by a reduction method to generate a silicon monoxide material; and S3, removing a residual reducing agent to obtain the silica fume based silicon monoxide negative electrode material. The invention also provides the silicon monoxide negative electrode material prepared by the method, a lithium battery negative electrode and a lithium ion battery. The preparation method of the silicon monoxide negative electrode material of the invention can greatly reduce the cost of the silicon negative electrode material, can effectively improve the recycling market of silica fume, and provides a novel important choice for the development of lithium ion battery negative electrode materials.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a silica fume-based silicon oxide negative electrode material, a preparation method thereof and a lithium ion battery manufactured with the composite negative electrode material. Background technique [0002] Silica fume powder is also called silica fume or agglomerated silica fume. It is ferroalloy. When smelting ferrosilicon and industrial silicon (metal silicon), a large amount of highly volatile SiO is produced in the submerged heat electric furnace. 2 And Si gas, after the gas is discharged, it is rapidly oxidized and condensed with air and precipitated. It is a by-product of large-scale industrial smelting, and the entire process needs to be recycled with dust removal and environmental protection equipment. Because of its low density, it also needs to be encrypted with encryption equipment. [0003] Silica fume powder is white in natural state, its main compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113H01M4/48H01M10/0525
CPCC01B33/113C01P2002/72C01P2004/03C01P2006/40C01P2006/80H01M4/483H01M10/0525Y02E60/10
Inventor 郑洪河王艳
Owner SUZHOU UNIV
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