FeSix embedded porous silicon composite material as well as preparation method and application thereof

A composite material and porous silicon technology, which is applied in the field of preparation of FeSix embedded porous silicon composite electrode, iron silicide embedded porous silicon composite material, can solve the problems of volume change, high energy consumption, and electrode performance degradation, and achieve the improvement of the first Coulombic efficiency , Relieve volume expansion, excellent long-term circulation effect

Inactive Publication Date: 2021-02-23
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an anode material, volume changes are a very serious problem, as these cause enormous mechanical stresses and lead to loss of electrical contact between the active material and the current collector
Therefore, the electrode performance drops sharply with increasing number of charge cycles
The second problem is the high resistivity of silicon, which leads to slow transport of electrons and lithium ions, which affects its electrochemical performance
[0005] At present, the preparation method of ferrosilicon is mainly through the method of high-energy ball milling, but this method has problems such as high energy consumption, long time required, harsh conditions, and uncontrollable products.

Method used

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  • FeSix embedded porous silicon composite material as well as preparation method and application thereof
  • FeSix embedded porous silicon composite material as well as preparation method and application thereof
  • FeSix embedded porous silicon composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of FeSix embedding porous silicon composite material preparation method is characterized in that, comprises the steps:

[0031] Step 1: Commercial ferrosilicon powder (200 mesh, mass fraction ratio Si:Fe=75:25) is ball milled with a ball mill at a speed of 400r / min for 1 hour to obtain ferrosilicon powder with uniform particle size, and the particle size is 1-3μm; The commercial magnesium powder and the ball-milled ferrosilicon powder are ground and mixed in a mortar according to the stoichiometric ratio of 1.5:1, and then placed in a crucible.

[0032] Step 2: put it into a tube furnace, heat it to 600°C at a heating rate of 5°C / min under an argon protective atmosphere and keep it warm for 6h to obtain the reacted mixture;

[0033] Step 3: Put the reacted mixture obtained in step 2 into a corundum crucible, then put it into a tube furnace and heat it to 750°C at a heating rate of 5°C / min for 6h under an ammonia atmosphere to obtain the reacted mixture;

[0034...

Embodiment 2

[0036] A kind of FeSix embedding porous silicon composite material preparation method is characterized in that, comprises the steps:

[0037] Step 1: Commercial ferrosilicon powder (200 mesh, mass fraction ratio Si:Fe=50:50) is ball milled with a ball mill at a speed of 400r / min for 1 hour to obtain ferrosilicon powder with uniform particle size, and the particle size is 1-3μm; The commercial magnesium powder and the ball-milled ferrosilicon powder are ground and mixed in a mortar according to the stoichiometric ratio of 1.5:1, and then placed in a crucible.

[0038] Step 2: put it into a tube furnace, heat it to 600°C at a heating rate of 5°C / min under an argon protective atmosphere and keep it warm for 6h to obtain the reacted mixture;

[0039] Step 3: Put the reacted mixture obtained in step 2 into a corundum crucible, then put it into a tube furnace and heat it to 750°C at a heating rate of 5°C / min for 6h under an ammonia atmosphere to obtain the reacted mixture;

[0040...

Embodiment 3

[0042] A kind of FeSix embedding porous silicon composite material preparation method is characterized in that, comprises the steps:

[0043] Step 1: Commercial ferrosilicon powder (200 mesh, mass fraction ratio Si:Fe=90:10) is ball milled with a ball mill at a speed of 400r / min for 1 hour to obtain ferrosilicon powder with uniform particle size, and the particle size is 1-3μm; The commercial magnesium powder and the ball-milled ferrosilicon powder are ground and mixed in a mortar according to the stoichiometric ratio of 1.5:1, and then placed in a crucible.

[0044] Step 2: put it into a tube furnace, heat it to 600°C at a heating rate of 5°C / min under an argon protective atmosphere and keep it warm for 6h to obtain the reacted mixture;

[0045] Step 3: Put the reacted mixture obtained in step 2 into a corundum crucible, then put it into a tube furnace and heat it to 750°C at a heating rate of 5°C / min for 6h under an ammonia atmosphere to obtain the reacted mixture;

[0046...

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Abstract

The invention relates to an FeSix embedded porous silicon composite material as well as a preparation method and application thereof. The composite material integrates the inherent advantages of nanoscale and micron-sized Si, the rapid diffusion and high Li <+> accessibility of an electrolyte are realized through three-dimensional bicontinuous nanopores, and mutually connected nanoscale silicon ligaments can prevent crushing and cracking. A three-dimensional bicontinuous nano-porous network formed by three-dimensional bicontinuous nano-pores allows the volume of the Si nano-ligand to be expanded inwards without obvious particle size change. The FeSix is embedded into the porous silicon composite material, so that on one hand, a supporting effect is achieved, and on the other hand, the resistivity of the FeSix is 200 times lower than that of silicon, so that the FeSix can be used as a conductive agent in porous silicon, the electron / lithium ion transportation speed is increased, the conductivity can be effectively improved by germanium, and the first coulombic efficiency of a battery can be obviously improved.

Description

technical field [0001] The invention relates to a porous silicon composite material and its preparation method and application field, in particular to an iron silicide embedded porous silicon composite material, a preparation method and a FeSix embedded porous silicon composite electrode. Background technique [0002] Lithium-ion batteries (LIBs) are widely used in portable electronic devices due to their high energy density, good rate capability, long cycle life, and low self-discharge rate. Graphite, which is commonly used as an anode material, has a capacity of 372 mA h g, and its capacity is insufficient to meet the requirements of electric vehicles and large-scale renewable energy storage systems. The current carbonaceous anode materials cannot meet the requirements of high specific capacity, and silicon is considered to be one of the most promising materials in the study of advanced materials to replace graphite. Silicon has a theoretical capacity of 3580 mA h g-1, te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/362H01M4/386H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 高标刘一帆霍开富付继江宋健
Owner WUHAN UNIV OF SCI & TECH
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