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A kind of multiphase composite nanostructure negative electrode material and preparation method thereof

A composite nanostructure and anode material technology, applied in structural parts, battery electrodes, electrical components, etc., can solve the problems of poor cycle stability, complex preparation process, and poor rate performance of high-capacity silicon-carbon anode materials, and achieve huge industrialization Application value, simple preparation method, effect of inhibiting volume expansion

Active Publication Date: 2020-08-11
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of poor cycle stability, poor rate performance, complex preparation method, low efficiency and high cost of silicon-based negative electrode materials existing in the prior art, the present invention provides a multiphase composite nanostructured negative electrode material and a preparation method thereof, which With a "concrete" structure, it can solve the problems of poor cycle stability, poor rate performance, complex preparation process and high cost of high-capacity silicon-carbon anode materials for lithium-ion batteries

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  • A kind of multiphase composite nanostructure negative electrode material and preparation method thereof
  • A kind of multiphase composite nanostructure negative electrode material and preparation method thereof
  • A kind of multiphase composite nanostructure negative electrode material and preparation method thereof

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Embodiment 1

[0035] The invention is a nano-composite negative electrode material with a "concrete" structure and a preparation method thereof, belonging to a high-capacity, long-life power type and energy storage type lithium-ion battery Si / SiO 2 / TiO 2 / Graphene / C multiphase composite "concrete" nanostructure anode material and its low-cost large-scale one-time preparation method.

[0036] The technical scheme of the present invention uses silicon-containing organic substances as surfactants to modify nano-silicon particles, and uses organic titanium compounds as TiO 2 Source, using graphene oxide dispersion as dispersant and precipitant, and then using glucose, sucrose or polyvinylpyrrolidone as organic carbon source, and then preparing Si / SiO by hydrothermal reaction once 2 / TiO 2 / Graphene / C multiphase composite concrete nanostructure anode material. Its preparation steps are as follows:

[0037] (1) Weigh 1g of 50nm silicon powder and place it in 100mL of ethanol, and obtain a prel...

Embodiment 2

[0050] (1) Weigh 1g of 30nm silicon powder and place it in 100mL of ethanol, and obtain a preliminary dispersed nanosilicon ethanol suspension after 15min of ultrasonic dispersion treatment.

[0051] (2) Under the condition of constant stirring, add 1mL tetraethyl orthosilicate (TEOS) as a surfactant dropwise into the nano-silicon ethanol suspension prepared in step (1), and then obtain TEOS after 15min ultrasonic dispersion treatment Ethanol dispersion of surface-modified silicon nanoparticles.

[0052] (3) Add 0.4mL tetrabutyl titanate dropwise to the ethanol dispersion of TEOS surface-modified silicon nanoparticles obtained in step (2) under constant stirring, and after stirring at a constant speed for 1 hour, co-modified silicon nanoparticles are obtained. Nanoparticle ethanol dispersion.

[0053] (4) Take 50 mL of 1 mg / mL graphene oxide (GO) dispersion, add 50 mL of deionized water, and shake well to obtain a 0.5 mg / mL graphene oxide diluted solution.

[0054] (5) Add t...

Embodiment 3

[0062] (1) Weigh 1 g of 90 nanometer silicon powder and place it in 100 mL of ethanol, and obtain a preliminary dispersed nano silicon ethanol suspension after 15 minutes of ultrasonic dispersion treatment.

[0063] (2) Under the condition of uniform stirring, add 0.4mL tetraethyl orthosilicate (TEOS) as a surfactant dropwise into the nano-silicon ethanol suspension prepared in step (1), followed by 30min ultrasonic dispersion treatment to obtain Ethanol dispersion of TEOS surface-modified silicon nanoparticles.

[0064] (3) Add 0.2mL tetrabutyl titanate dropwise to the ethanol dispersion of TEOS surface-modified silicon nanoparticles obtained in step (2) under constant stirring, and stir at a constant speed for 30 minutes to obtain co-modified silicon nanoparticles. Nanoparticle ethanol dispersion.

[0065] (4) Take 50 mL of 1 mg / mL graphene oxide (GO) dispersion, add 200 mL of deionized water, and shake to obtain a 0.2 mg / mL graphene oxide diluted solution.

[0066] (5) Ad...

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Abstract

The invention discloses a polyphase composite nanostructured negative electrode material and a preparation method thereof, and belongs to the fields of lithium ion battery negative electrode materials and preparation methods thereof. The polyphase composite nanostructured negative electrode material is a concrete-like structure, and the Si / SiO2 / TiO2 / graphene / C polyphase composite concrete-like nanostructured negative electrode material is once prepared through a hydrothermal reaction by adopting surfactant modified silicon nanoparticles as a SiO2 source, an organic titanium compound as a TiO2 source, a graphene oxide dispersion as a dispersant and a precipitant and glucose, sucrose or polyvinylpyrrolidone as an organic carbon source. The material effectively overcomes the disadvantages of poor cycle stability and poor rate performance of a silicon-based negative electrode material, an ion battery produced by adopting the material as a negative electrode has the advantages of high capacity and long life, and the preparation method has the advantages of simplicity, suitableness for industrial preparation, cheap and easily available raw materials, and great industrial application values.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials and preparation methods thereof, and more specifically relates to a multiphase composite nanostructure negative electrode material and a preparation method thereof. Background technique [0002] With the rapid depletion of fossil energy such as oil and natural gas, and the large-scale exploitation of shale gas has also brought a huge impact on the earth's atmosphere and marine environment, so environmentally friendly new technologies such as solar energy, wind energy, biomass energy and tidal energy in today's human society Energy technology has attracted much attention. However, since the power generation of solar energy, wind energy and tidal energy changes with the change of the power generation environment, it is extremely unstable, and cannot enter thousands of households and various enterprises and institutions by merging into the national public power supply n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCH01M4/62H01M4/625H01M4/628Y02E60/10
Inventor 黄镇东马延文张坤冯晓苗刘瑞卿李盼林秀婧
Owner NANJING UNIV OF POSTS & TELECOMM
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