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Dispersedly distributed metal silicide/nano-silicon composite material and preparation method thereof

A metal silicide and composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of coarse particle size of metal phase, limited enhancement effect, and difficulty in uniform distribution, etc. The preparation process is simple, the cost is low, and the performance is improved

Active Publication Date: 2020-04-28
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN102916167A discloses a mesoporous silicon composite composed of mesoporous silicon phase, metal silicide phase and carbon phase, the first discharge specific capacity is 1595.4mAh / g, the first charge specific capacity is 931.9mAh / g, and the first coulombic efficiency 58.4%, but its metal phase was introduced by solution impregnation method, and did not enter the interior of the original silicon particles, the interface bonding strength with other silicon particles was low, and the particle size of the metal phase was coarse, so it was difficult to evenly distribute in the carbon-coated silicon particles. Inside the granular structure, the reinforcement effect is limited and the reversible capacity is low

Method used

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  • Dispersedly distributed metal silicide/nano-silicon composite material and preparation method thereof
  • Dispersedly distributed metal silicide/nano-silicon composite material and preparation method thereof
  • Dispersedly distributed metal silicide/nano-silicon composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] 1. Disperse 4.5ml of tetraethyl orthosilicate in 45mL of ethanol to obtain mixed solution 1; disperse 1.38g of ammonium metatungstate and 3.83g of urea in a solvent composed of 41mL of ethanol and water (volume ratio of ethanol and water is 16: 25), the mixed solution 2 is obtained, wherein the molar ratio of tungsten and silicon added is 1:3 (calculation of this molar ratio: it is the molar ratio of silicon and metal elements in silicon dioxide produced by the theoretical hydrolysis of liquid silicon source ratio, the same as in subsequent examples); Pour the mixed solution 2 into the mixed solution 1 quickly, and stir at 650r / min at room temperature for 30min, and then carry out a hydrothermal reaction at 200°C for 12h to obtain a colloidal Precipitate, filter, and wash the precipitate with water to be neutral, and dry at 60°C to obtain a tungsten silicide / silicon dioxide composite precursor.

[0029] 2. Take 1g of tungsten silicide / silicon dioxide composite precursor...

Embodiment 2

[0050] 1. Disperse 4.5ml tetraethyl orthosilicate in 45mL ethanol to obtain mixed solution 1; disperse 1.03g ammonium metatungstate and 3.834g urea in a solvent composed of 41mL ethanol and water (volume ratio of ethanol and water is 16: 25), the mixed solution 2 was obtained, wherein the molar ratio of tungsten and silicon added was 1:4; the mixed solution 2 was quickly poured into the mixed solution 1, and stirred at 650r / min at room temperature for 30min, and then it was The hydrothermal reaction was carried out at 200°C for 12 hours to obtain a colloidal precipitate, which was filtered, washed with water and turned neutral, and dried at 60°C to obtain a tungsten silicide / silicon dioxide composite precursor.

[0051] 2. Take 1g of tungsten silicide / silicon dioxide composite precursor powder, mix it with 10g of sodium chloride, add 0.9g of metal magnesium powder, put it in a sealed tube furnace, and raise the temperature at 5°C / min to Keep warm at 400°C for 0.5h, then raise ...

Embodiment 3

[0058] 1. Disperse 4.5ml tetraethyl orthosilicate in 45mL ethanol to obtain mixed solution 1; disperse 0.69g ammonium metatungstate and 3.834g urea in a solvent composed of 41mL ethanol and water (volume ratio of ethanol and water is 16: 25), the mixed solution 2 was obtained, wherein the molar ratio of tungsten and silicon added was 1:6; the mixed solution 2 was quickly poured into the mixed solution 1, and stirred at room temperature for 30 min at 650 r / min, and then it was The hydrothermal reaction was carried out at 190°C for 24 hours to obtain a colloidal precipitate, which was filtered and washed with water to be neutral, and dried at 60°C to obtain a tungsten silicide / silicon dioxide composite precursor.

[0059]2. Take 1g of metal silicide / silicon dioxide composite precursor powder, mix it with 10g of sodium chloride, add 0.9g of metal magnesium powder, put it in a sealed tube furnace, and raise the temperature at 5°C / min under an argon atmosphere Heat at 400°C for 0.5...

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Abstract

The invention discloses a dispersedly distributed metal silicide / nano-silicon composite material and a preparation method thereof. The dispersedly distributed metal silicide / nano-silicon composite material is composed of metal silicide and nano-silicon particles, wherein part of the metal silicide is dispersedly distributed inside the nano-silicon, and the other part of the metal silicide coats the surfaces of the nano-silicon particles; and the mass percentage of the metal silicide in the composite material is 0.89%-16.45%, and the balance is silicon. According to the dispersedly distributedmetal silicide / nano-silicon composite material, specific metal silicide with a dispersion strengthening effect intervenes into the nano-silicon particles, is dispersedly distributed, and forms a metalsilicide coating layer on the surfaces of the nano-silicon particles. When the dispersedly distributed metal silicide / nano-silicon composite material is applied to a lithium ion battery negative electrode material, the cycle performance and the stability performance are far superior to those of an existing nano-silicon negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and in particular relates to a dispersed metal silicide / nano-silicon composite material and a preparation method thereof. Background technique [0002] At present, limited by the low theoretical capacity of graphite materials, the energy density and power density of lithium-ion batteries are difficult to break through. The development of new lithium-ion battery anode materials with high specific capacity, stable structure, and excellent cycle stability has practical significance for the improvement of lithium-ion battery performance and the expansion of applications. Among many alternative materials for graphite anodes, silicon-based materials have high theoretical lithium storage capacity, suitable potential platform, relatively safe, and wide sources of raw materials, and are the most promising new anode materials. However, there are still many problems that hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCH01M4/364H01M4/366H01M4/386H01M4/624H01M10/0525B82Y30/00Y02E60/10
Inventor 唐晶晶杨娟周向阳罗楚城周昊宸王鹏
Owner 湖南宸宇富基新能源科技有限公司
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