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Nitrogen-doped carbon/nano-silicon composite negative electrode material and preparation method thereof

A nitrogen-doped carbon, negative electrode material technology, applied in negative electrodes, nano-carbon, nanotechnology and other directions, can solve the problems affecting battery performance, poor conductivity of silicon-based materials, volume expansion, etc., to achieve electrochemical capacity improvement, high usage Efficiency, the effect of improving conductivity

Inactive Publication Date: 2020-12-22
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of material also has some important problems, the most notable one is the serious volume expansion during the lithiation process, which easily leads to powdering and falling off of the electrode material, which seriously affects the cycle stability of the battery; at the same time, the silicon-based material has poor conductivity. , which is not conducive to the electron transport during the electrochemical reaction, thus affecting the performance of the battery

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  • Nitrogen-doped carbon/nano-silicon composite negative electrode material and preparation method thereof
  • Nitrogen-doped carbon/nano-silicon composite negative electrode material and preparation method thereof
  • Nitrogen-doped carbon/nano-silicon composite negative electrode material and preparation method thereof

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Embodiment 1

[0033] An embodiment of the preparation method of the nitrogen-doped carbon and nano-silicon composite negative electrode material described in the present invention, the preparation method of the nitrogen-doped carbon and nano-silicon composite negative electrode material described in this embodiment includes the following steps:

[0034] (1) Put 0.2g of nano-silicon powder into 30mL of ethanol, add 20mL of 1mol / L sodium persulfate solution after ultrasonic dispersion and stir at 0°C for 0.5h to obtain dispersion A; The diameter is 30nm;

[0035] (2) Add 500 μL of pyrrole to the dispersion A obtained in step (1), stir and mix, and react at 0°C for 5 hours, filter and wash the obtained solid with ethanol and water, and dry at 60°C to obtain precursor B;

[0036] (3) Precursor B obtained in step (2) was calcined at 800° C. for 3 hours and then cooled to obtain the nitrogen-doped carbon and nano-silicon composite negative electrode material.

[0037] Carry out X-ray powder diff...

Embodiment 2

[0044] An embodiment of the preparation method of the nitrogen-doped carbon and nano-silicon composite negative electrode material described in the present invention, the preparation method of the nitrogen-doped carbon and nano-silicon composite negative electrode material described in this embodiment includes the following steps:

[0045] (1) Put 0.2g of nano-silica powder into 30mL of ethylene glycol, add 20mL of 1mol / L sodium persulfate solution after ultrasonic dispersion and stir at 0°C for 0.5h to obtain dispersion A; the nano-silica powder The particle size is 80nm;

[0046] (2) Add 500 μL of pyrrole to the dispersion A obtained in step (1), stir and mix, and react at 0°C for 5 hours, filter and wash the obtained solid with ethanol and water, and dry at 60°C to obtain precursor B;

[0047] (3) Precursor B obtained in step (2) was calcined at 800° C. for 3 hours and then cooled to obtain the nitrogen-doped carbon and nano-silicon composite negative electrode material.

...

Embodiment 3

[0050] An embodiment of the preparation method of the nitrogen-doped carbon and nano-silicon composite negative electrode material described in the present invention, the preparation method of the nitrogen-doped carbon and nano-silicon composite negative electrode material described in this embodiment includes the following steps:

[0051] (1) Put 0.2g of nano-silicon powder into 30mL of deionized water, add 20mL of 1mol / L ferric chloride solution after ultrasonic dispersion and stir at 0°C for 0.5h to obtain dispersion A; the nano-silicon powder The particle size is 30nm;

[0052] (2) Add 500 μL of aniline to the dispersion A obtained in step (1), stir and mix, and react at 0°C for 5 hours, filter and wash the obtained solid with ethanol and water, and dry at 60°C to obtain precursor B;

[0053] (3) Precursor B obtained in step (2) was calcined at 650° C. for 4 hours and then cooled to obtain the nitrogen-doped carbon and nano-silicon composite negative electrode material.

...

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Abstract

The invention discloses a preparation method of a nitrogen-doped carbon / nano-silicon composite negative electrode material, belonging to the field of new energy materials and electrochemistry. The method comprises the following steps: (1) putting nano-silicon powder into a solvent, conducting ultrasonic dispersion, adding an initiator solution, and conducting sufficient stirring and mixing to obtain a dispersion liquid A, wherein the particle size of the nano-silicon powder is 30-80 nm; (2) adding a carbon source into the dispersion liquid A obtained in the step (1), conducting stirring and mixing, carrying out a polymerization reaction, performing filtering, and washing and drying the obtained solid to obtain a precursor B, wherein the carbon source comprises at least one selected from pyrrole, dopamine and aniline, and a ratio of the mass of the nano-silicon powder to the volume of the carbon source is 0.15-0.25 g: 400-800 [mu]L; and (3) heating and calcining the precursor B obtainedin the step (2) and then conducting cooling to obtain the nitrogen-doped carbon / nano-silicon composite negative electrode material. The invention also provides the nitrogen-doped carbon / nano-siliconcomposite negative electrode material prepared by using the method and a lithium ion battery containing the nitrogen-doped carbon / nano-silicon composite negative electrode material.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemistry, and specifically relates to a nitrogen-doped carbon and nano-silicon composite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently the most widely used and commercialized energy storage batteries. Since Sony Corporation developed and commercialized it at the end of the last century, lithium-ion batteries have played a huge role in people's production and life, such as electric vehicles and portable electronic devices. [0003] The current commercial lithium-ion battery anode material is mainly graphite. However, the theoretical capacity of graphite anode is low (372mAh / g), which cannot meet the current development needs of high energy density of lithium-ion batteries. Therefore, the development of high-capacity negative electrode materials is an important topic in the development of lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/02C01B32/15H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCC01B33/02C01B32/15H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00H01M2004/021H01M2004/027Y02E60/10
Inventor 吴明娒何乔童圣富符舒婷曹阳飞
Owner SUN YAT SEN UNIV
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