Li<21>Si<5>/C composite material, preparation method and application

A composite material and compound technology, which is applied in the field of preparing nano-Li21Si5 and carbon composite electrode materials, can solve problems such as reduction, and achieve the effects of good process stability, simple operation and excellent electrochemical performance.

Active Publication Date: 2017-08-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium-silicon alloys are extremely reductive. During the electrode preparation and battery assembly process, the lithium in the material is easy to react with organic solvents and electrolytes, thereby significantly reducing the ability to provide lithium.

Method used

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  • Li&lt;21&gt;Si&lt;5&gt;/C composite material, preparation method and application
  • Li&lt;21&gt;Si&lt;5&gt;/C composite material, preparation method and application
  • Li&lt;21&gt;Si&lt;5&gt;/C composite material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Silicon nanoparticles with an average particle size of 50 nm were heated to 100 °C under vacuum to remove the adsorbed gas and moisture, and then according to Li 21 Si 5 Compound composition distribution ratio, weigh 280mg dried silicon nanoparticles and 308mg lithium flakes in an argon glove box, put them into a tantalum crucible, then move the silicon nanoparticles, lithium flakes and tantalum crucible into a stainless steel ball mill jar, In an argon-protected environment, the silicon nanoparticles and lithium flakes were magnetically stirred in a tantalum crucible with an external magnetic stirrer. At the same time, the stainless steel ball mill was heated to 200 ° C and kept for 9 hours. The average particle size was thus prepared. 200 nm Li 21 Si 5 Particles, whose phase analysis results are as follows figure 1 As shown, its microscopic appearance is as figure 2 Shown; the above-prepared Li 21 Si 5 The particles are mixed with acetylene black with a mass ra...

Embodiment 2

[0028] Silicon nanoparticles with an average particle size of 70 nm were heated to 150 °C under vacuum to remove the adsorbed gas and moisture, and then according to Li 21 Si 5 Compound composition ratio, weigh 300mg dried silicon nanoparticles and 330mg lithium flakes in an argon glove box, put them into a tantalum crucible, then move the silicon nanoparticles, lithium flakes and tantalum crucible into a stainless steel ball mill tank, In an argon-protected environment, the silicon nanoparticles and lithium flakes were magnetically stirred in a tantalum crucible with an external magnetic stirrer, and at the same time, the ball mill jar was heated to 230°C and kept for 6 hours. The average particle size obtained was about 280 nm Li 21 Si 5 Particles; the above-prepared Li 21 Si 5Particles are mixed with acetylene black with a mass ratio of 20%. The ball milling process is as follows: the ball-to-material ratio is 20:1, the ball milling speed is 500r / min, and the ball milli...

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Abstract

The invention relates to a Li<21>Si<5> / C composite material, a preparation method and an application, which belong to the field of lithium-rich anode materials for lithium ion batteries. Silicon nanoparticles and lithium plates are heated for lithiation at 200 DEG C to 230 DEG C under a stirring condition, so that Li<21>Si<5> nanoparticles, the grain size of which is 100 to 280 nanometers, are prepared, the Li<21>Si<5> particles are then ball-milled and mixed with acetylene black, and a spark plasma sintering method is then utilized to prepare a dense block. The novel composite material prepared by the method has excellent electrochemical properties.

Description

technical field [0001] The invention belongs to the field of lithium-rich negative electrode materials for lithium-ion batteries, in particular to a method for preparing nano-Li 21 Si 5 and carbon composite electrode materials. Background technique [0002] Due to the advantages of high energy density and low cost, lithium-sulfur and lithium-oxygen batteries have become a research hotspot in the field of energy storage materials in recent years, and are expected to be applied in many large-scale energy storage fields such as smart grids and electric vehicles. Dendrite formation and safety issues of lithium anodes are currently important limiting factors restricting its large-scale commercial application. Therefore, it is urgent to develop lithium-rich anode materials with high specific capacity and high safety to replace the current metal lithium anodes. Lithium-silicon alloy has become the most potential alternative material for lithium metal due to its high theoretical s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/40H01M4/62H01M10/0525
CPCH01M4/364H01M4/405H01M4/62H01M10/0525Y02E60/10
Inventor 宋晓艳杨科侯超刘雪梅王海滨
Owner BEIJING UNIV OF TECH
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