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Novel silicon-carbon composite negative electrode material and preparation method thereof

A silicon-carbon composite, negative electrode material technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of not particularly obvious effect and battery capacity attenuation.

Pending Publication Date: 2020-05-19
SHENZHEN XIANGFENGHUA TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, silicon-carbon materials often use organic polymers such as pitch, resin, and glucose as carbon sources by high-temperature pyrolysis to obtain silicon-carbon composite materials with a core-shell structure. The cycle performance can be improved, but the effect is not particularly obvious, and the capacity of the battery remains the same. There will be a clear attenuation trend with the increase of circulation

Method used

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Examples

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preparation example Construction

[0022] The invention discloses a preparation method of a novel silicon-carbon composite negative electrode material, which includes the following steps:

[0023] (1) SiO 2 The microspheres are dispersed in a solution containing a dispersant. SiO used 2 The average particle size D50 of the microspheres is 0.01-20 microns, and the dispersant used is hydroxymethylcellulose (CMC), cetyltrimethylammonium bromide (CTAB), sodium pyrophosphate, sodium hexametaphosphate or One of sodium polyacrylate, the solvent used is one or more of water, methanol, ethanol, propanol, acetone, ether, N,N-2-methylformamide; the SiO used 2 The mass ratio of the solvent to the dispersant is 1:1-5, and the volume of the solvent used is 50-150mL.

[0024] (2) Add metal salts to the solution obtained in step (1) and mix well. The metal salt used to form MOF is Co(NO 3 ) 2 , Zn(NO 3 ) 2 , Bi(NO 3 ) 2 , Cu(NO 3 ) 2 , Fe(NO 3 ) 2 One or several in the solution, the metal salt used and SiO 2 The...

Embodiment 1

[0031] A method for preparing a novel silicon-carbon composite negative electrode material, comprising the following steps:

[0032] (1) 1g of SiO with a particle size of 0.01 micron 2 The microspheres were added to 100mL methanol solution, and 4g dispersant CTAB was added at the same time, and ultrasonically dispersed for 3h to make the dispersion uniform.

[0033] (2) Add 4g Zn(NO 3 ) 2 ·6H 2 O and 0.2g Co(NO 3 ) 2 ·6H 2 O, stirred for 2h.

[0034] (3) Dissolve 12.2g of the organic ligand 2-methylimidazole in 100mL of ethanol solution, slowly pour it into the solution of step (2) after the dissolution is complete, stir for 1 hour and then centrifuge and dry to obtain MOF-coated SiO 2 precursor material.

[0035] (4) SiO coated on 4g MOF 2 10g metal Mg powder was added to the precursor material, mixed evenly, then transferred to a tube furnace, and heated at 5°C / min to 700°C for 6h in a nitrogen atmosphere.

[0036](5) Wash the obtained powder through 1M HCl solutio...

Embodiment 2

[0044] A method for preparing a novel silicon-carbon composite negative electrode material, comprising the following steps:

[0045] (1) 0.5g of SiO with a particle size of 0.05 microns 2 The microspheres were added to 80mL of methanol solution, and 2g of dispersant sodium pyrophosphate was added at the same time, and ultrasonically dispersed for 3h to make the dispersion uniform.

[0046] (2) Add 2g Zn(NO 3 ) 2 ·6H 2 O, stirred for 2h.

[0047] (3) Dissolve 4g of 2-methylimidazole as an organic ligand in 80mL ethanol solution. After the dissolution is complete, slowly pour it into the solution in step (2), stir for 1 hour, and then centrifuge and dry to obtain MOF-coated SiO 2 precursor material.

[0048] (4) SiO coated on 3g MOF 2 6.2g metal Mg powder was added to the precursor material, mixed evenly, then transferred to a tube furnace, and heated at 1°C / min to 600°C for 3h in an argon atmosphere.

[0049] (5) The obtained powder is washed with 1M HF solution and deio...

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Abstract

The invention discloses a novel silicon-carbon composite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: firstly, growing a layer ofmetal organic framework (MOF) on surfaces of SiO2 microspheres; and then carrying out metal thermal reduction, acid pickling and drying to obtain the novel silicon-carbon composite negative electrodematerial which is a carbon-coated porous silicon composite negative electrode material. The synthesis method has characteristics of novelty, uniqueness, easy operation and low cost, and the preparedmaterial has characteristics of a high capacity and a long cycle life, and can be used as a lithium ion negative electrode material of various high-capacity devices.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a novel silicon-carbon composite negative electrode material and a preparation method thereof. Background technique [0002] The rapid development of electric vehicles in recent years has made people put forward higher requirements for the energy density of lithium-ion batteries. As one of the key materials of lithium-ion batteries, the development of new negative electrode materials with high specific energy, good safety and low cost is of great significance for improving the energy density of lithium-ion batteries. Silicon-based materials have attracted attention due to their ultra-high theoretical energy density (4200mAh / g). At present, silicon-based materials mainly suffer from serious volume expansion and poor electronic conductivity, which will make the battery have a very low first-time efficiency, which is extremely Poor cycle performance and...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 赵东辉周鹏伟白宇李二威
Owner SHENZHEN XIANGFENGHUA TECH CO LTD
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