Silicon-based composite material and preparation method and applications thereof

A silicon-based composite material and silicate technology, which is applied in electrical components, battery electrodes, circuits, etc., can solve problems such as increased gaps between active material particles, collapse of lattice structure, and reduced conductivity of pole pieces.

Active Publication Date: 2013-11-20
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The expansion and shrinkage of the particles cause the lattice structure of the silicon particles to collapse, the material is granulated and loses its activity, and the expansion of the pole piece will lead to an increa...

Method used

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  • Silicon-based composite material and preparation method and applications thereof
  • Silicon-based composite material and preparation method and applications thereof
  • Silicon-based composite material and preparation method and applications thereof

Examples

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preparation example Construction

[0030] The method for preparing a silicon-based composite material according to the second aspect of the present invention, which prepares the silicon-based composite material according to the first aspect of the present invention, includes the following steps: dispersing silicon particles into absolute ethanol and / or deionized water to form Suspension; disperse the silicate and optional carbon in absolute ethanol and / or deionized water to form a suspension; ultrasonically shake the two suspensions separately and then stir at room temperature; add the silicon particle suspension dropwise Silicate and optionally carbon in suspension to form a mixture which is heated and stirred until the mixture evaporates into a paste; the paste is dried in an oven to obtain a lump , and then grind and sieve the block to obtain granular undersize; heat-treat the granular undersize in an inert atmosphere, and then grind and sieve to obtain silicon particles, silicates, and optional carbon. Sili...

Embodiment 1

[0041] Disperse 2.4g of silicon particles in 80g of deionized water to form a suspension, wherein the mass ratio of silicon particles to deionized water is 3.0%:1;

[0042] 1.4g Li 2 SiO 3 and 0.2g acetylene black (a kind of carbon (C)) are dispersed in 100g deionized water to form a suspension, wherein Li 2 SiO 3 , The mass ratio of acetylene black to deionized water is 1.4%:0.2%:1;

[0043] The above two suspensions were ultrasonically oscillated for 30 min and then stirred at room temperature for 5 h;

[0044] The suspension of silicon particles was added dropwise to the Li 2 SiO 3 / C suspension, form a mixed solution, and stir at 40°C at the same time, add dropwise and stir for 6 hours, until the mixed solution evaporates into a paste;

[0045] Drying the paste in an oven at 60°C to obtain lumps, and then grinding and sieving the lumps to obtain granular undersize;

[0046] The granular undersize was heat-treated at 400 °C for 6 h in an argon atmosphere, and then th...

Embodiment 2

[0048] Disperse 2.0g of silicon particles in 2000g of absolute ethanol to form a suspension, the mass ratio of silicon particles to absolute ethanol is 0.1%:1;

[0049] 1.6g Li 8 SiO 6 and 0.4g of graphite (a kind of carbon (C)) are dispersed in 2000g of absolute ethanol to form a suspension, wherein Li 8 SiO 6 , The mass ratio of graphite and absolute ethanol is 0.08%:0.02%:1;

[0050] The above two suspensions were ultrasonically oscillated for 10 min and then stirred at room temperature for 5 h;

[0051] The suspension of silicon particles was added dropwise to the Li 8 SiO 6 / C suspension, form a mixed solution, while stirring at 25°C, add dropwise and stir for 10 hours, until the mixed solution evaporates into a paste;

[0052] Drying the paste in an oven at 60°C to obtain lumps, and then grinding and sieving the lumps to obtain granular undersize;

[0053] The granular undersize was heat-treated at 500 °C for 5 hours in an argon atmosphere, and then the heat-treat...

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Abstract

The invention provides a silicon-based composite material, which is prepared from silicon particles, silicate and optional carbon, wherein the mixture of the silicate and the optional carbon forms a massive body, and the silicon particles are dispersed in the massive body. A preparation method comprises the following steps of: dispersing the silicon particles into absolute ethyl alcohol and/or deionized water to form suspension liquid; dispersing the silicate and the optional carbon into the absolute ethyl alcohol and/or the deionized water to form suspension liquid; ultrasonically oscillating the two kinds of suspension liquid respectively, and then stirring; dropwise adding the suspension liquid of the silicon particles into the suspension liquid of the silicate and the optional carbon to form mixed liquid, heating and stirring the mixed liquid until evaporating the mixed liquid into paste; then, putting the paste in an oven to be dried to obtain masses, and grinding and sieving to obtain undersize particles; and conducting heat treatment in an inert atmosphere, and grinding and sieving to obtain the silicon-based composite material. According to the silicon-based composite material, a lattice structure of the silicon particles can be ensured, therefore the activity of the silicon particles is ensured, and the energy density, the first-time coulomb efficiency and the high-temperature storage performance of lithium ion batteries are increased.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon-based composite material, a preparation method thereof, and an application thereof. Background technique [0002] Due to the advantages of high output voltage, large specific energy, small self-discharge, no memory effect, and environmental friendliness, lithium-ion batteries are widely used in various portable electronic devices, and also have great applications in electric vehicles, energy storage equipment and other fields. Good application prospects. [0003] At present, the negative electrode active materials of commercial lithium-ion batteries are usually graphite materials. + Intercalation of graphite interlayers to form LiC 6 compound, when discharged Li + from the graphite layer. The theoretical gram capacity of graphite materials is 372mAh / g. The actual gram capacity of graphite materials currently used has reached 360mAh / g, which is very close to the ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/134H01M4/1395
CPCY02E60/122Y02E60/10
Inventor 王彦平何东铭牛少军
Owner NINGDE AMPEREX TECH
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