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Silicon/carbon nano composite fiber and application thereof

A carbon nanocomposite, composite nanofiber technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as decline, electrode material structure crushing capacity, and unsatisfactory performance. Deactivation and loss of electrical contact, improving structural and electrochemical stability, preventing shedding

Inactive Publication Date: 2016-11-16
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The experimental results show that the cycle stability of sucrose pyrocarbon-coated silicon / carbon nanocomposite fibers is significantly improved (Hu Yi, Chen Yanli, Shen Zhen, etc., a silicon-based negative electrode material and its preparation method, patent application number: 201510515228.9 ), but the performance is still not ideal
This is because the carbon layer introduced on the surface of the fiber tightly covers the surface of the particles, and the volume change of the particles will affect the carbon layer on the outer layer. After many cycles, it will still cause the structure of the electrode material to break and the capacity to decline.

Method used

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  • Silicon/carbon nano composite fiber and application thereof
  • Silicon/carbon nano composite fiber and application thereof
  • Silicon/carbon nano composite fiber and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Disperse 200 mg of silicon nanoparticles into 400 mL of ethanol / water mixed solution, where the volume ratio of ethanol to water is 4:1 (V:V). Add 4.0 mL of concentrated ammonia water and 2.0 g of ethyl orthosilicate dropwise to the mixed solution. The mixed solution was stirred at room temperature for 12 h, then centrifuged, washed with ethanol three times, and dried at 80 °C to obtain Si@SiO with a core-shell structure. 2 particles.

[0038] (2) Use an electronic balance to take 0.2g of Pingpingjia O and dissolve it in 5g of N-N dimethylformamide, put it in a 20mL sample bottle, heat and stir at 60°C until it is completely dissolved. Then take 0.2 g Si@SiO with a balance 2 , 0.4g of polyacrylonitrile was dissolved in the mixed solution, the sample bottle was sealed with a parafilm, stirred at 60°C for 24 h, and ultrasonically dispersed at room temperature for 1 h to obtain a uniformly dispersed spinning solution. Cut out an aluminum foil paper with a size of 40...

Embodiment 2

[0044] (1) Disperse 200 mg of silicon nanoparticles into 400 mL of ethanol / water mixed solution, where the volume ratio of ethanol to water is 4:1 (V:V). Add 4.0 mL of concentrated ammonia water and 2.0 g of ethyl orthosilicate dropwise to the mixed solution. The mixed solution was stirred at room temperature for 12 h, then centrifuged, washed with ethanol three times, and dried at 80 °C to obtain Si@SiO2 particles with a core-shell structure.

[0045] (2) Dissolve 0.2 g of Pingpinga O in 5 g of N-N dimethylformamide with an electronic balance, place it in a 20 mL sample bottle, and heat and stir at 60°C until completely dissolved. Afterwards, 0.2 g Si@SiO2 and 0.4 g polyacrylonitrile were dissolved in the mixed solution with a balance, and the sample bottle was sealed with a parafilm, stirred at 60°C for 24 hours, and ultrasonically dispersed at room temperature for 1 hour to obtain a uniformly dispersed spinning solution. Cut out an aluminum foil paper with a size of 40 cm ...

Embodiment 3

[0052] (1) Disperse 200 mg of silicon nanoparticles into 400 mL of ethanol / water mixed solution, where the volume ratio of ethanol to water is 4:1 (V:V). Add 4.0 mL of concentrated ammonia water and 2.0 g of ethyl orthosilicate dropwise to the mixed solution. The mixed solution was stirred at room temperature for 12 h, then centrifuged, washed with ethanol three times, and dried at 80 °C to obtain Si@SiO with a core-shell structure. 2 particles.

[0053] (2) Dissolve 0.2 g of Pingpinga O in 5 g of N-N dimethylformamide with an electronic balance, place it in a 20 mL sample bottle, and heat and stir at 60°C until completely dissolved. Then take 0.2g Si@SiO with a balance 2 , 0.4 g of polyacrylonitrile was dissolved in the mixed solution, the sample bottle was sealed with a parafilm, stirred at 60 °C for 24 hours, and ultrasonically dispersed at room temperature for 1 h to obtain a uniformly dispersed spinning solution. Cut out an aluminum foil paper with a size of 40 cm × 40...

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Abstract

The invention relates to the field of silicon-based negative electrode materials of lithium-ion batteries, in particular to a silicon / carbon nano composite fiber and an application thereof. The silicon / carbon nano composite fiber comprises the silicon / carbon nano composite fiber; and certain gaps exist between silicon particles and a carbon layer to accommodate volume changes of the silicon particles, so that the structure stability and the cycling stability of an electrode are improved. A silicon dioxide layer is introduced to the surfaces of the silicon nanoparticles through a sol-gel method; Si@SiO2 particles with a core-shell structure are dispersed into the carbon fiber through electrostatic spinning and subsequent carbonization processes; and finally the silicon dioxide layer in a sample is selectively removed through a hydrofluoric acid to obtain the hollow carbon sphere / carbon nano fiber embedded with the silicon nanoparticles.

Description

technical field [0001] The invention relates to the field of silicon-based negative electrode materials for lithium ion batteries, in particular to a silicon / carbon nanocomposite fiber and its application. Background technique [0002] Lithium-ion battery is currently the battery system with the best comprehensive performance on the market. Compared with several other secondary batteries, such as lead-acid batteries, nickel-chromium batteries and metal hydride nickel batteries, lithium-ion batteries have the advantages of low cost and high energy density, so they are widely used in mobile phones, digital cameras and notebook computers and other portable electronic devices. And with the rapid growth of the electric vehicle market, the development of lithium-ion batteries has ushered in a new round of opportunities. At present, commercial lithium-ion batteries use graphite and various carbon materials with graphite as precursors as negative electrodes. Although carbon mater...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62B82Y30/00H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M4/625H01M10/0525B82Y30/00Y02E60/10
Inventor 胡毅陈艳丽陈仁忠沈桢何霞
Owner ZHEJIANG SCI-TECH UNIV
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