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Si/SiO2/C composite nanofiber material, preparation method thereof and anode material

A technology of composite nanofibers and carbon nanofibers, applied in the direction of negative electrodes, nanotechnology, nanotechnology, etc., can solve the problems of affecting battery cycle stability, detachment and cracking of carbon coating layers, poor structural stability of silicon-carbon composite materials, etc. , to achieve the effect of excellent cycle stability and rate performance

Active Publication Date: 2019-02-26
桑德新能源技术开发有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The first object of the present invention is to provide a Si / SiO 2 / C composite nanofiber material to alleviate the technical problem that in the existing carbon-coated silicon core-shell structure composite material, the carbon coating layer is easy to detach from silicon and rupture, thereby affecting the battery cycle stability
[0005] The second object of the present invention is to provide a Si / SiO 2 / C composite nanofiber material preparation method to alleviate the problem of poor structural stability of silicon-carbon composite materials obtained by existing preparation methods

Method used

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  • Si/SiO2/C composite nanofiber material, preparation method thereof and anode material
  • Si/SiO2/C composite nanofiber material, preparation method thereof and anode material
  • Si/SiO2/C composite nanofiber material, preparation method thereof and anode material

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preparation example Construction

[0046] In a second aspect, the present invention provides a Si / SiO 2 The preparation method of / C composite nanofiber material comprises the following steps:

[0047] Available with Si / SiO 2 The electrospinning dispersion of particles, after electrospinning and carbonization treatment, the Si / SiO 2 / C composite nanofiber material.

[0048] Electrospinning method on Si / SiO 2 Particles coated with carbon nanofibers can be realized on Si / SiO 2 Growth of carbon nanofibers on the particle surface improves the Si / SiO 2 The bonding strength between particles and carbon nanofibers, thereby improving the Si / SiO 2 Structural stability of / C composite nanofibrous materials.

[0049] In some embodiments of the present invention, the preparation method of the electrospinning dispersion comprises the following steps:

[0050] a) Preparation of Si / SiO 2 Particles: Provide a mixed aqueous solution containing lithium salt and complexing agent, add Si particles to the mixed aqueous solu...

Embodiment 1

[0096] This embodiment is a Si / SiO 2 / C composite nanofiber materials, such as figure 1 with 2 As shown, including: carbon nanofibers 10 and Si / SiO located inside the carbon nanofibers 10 2 Particle 20, Si / SiO 2 Particle 20 is a core-shell structure, including Si particle 201 and SiO coated Si particle 2 cladding layer 202 .

[0097] The Si / SiO 2 / C composite nanofiber material preparation method is as follows:

[0098] A) Configure 600mL of polyvinylpyrrolidone (PVP) absolute ethanol solution at a mass fraction of 12%, and stir at 25°C for 12h to obtain an electrospinning solution;

[0099] B) Add 1.97g of lithium hydroxide, 15.8g of citric acid and 5.72g of nano-Si into an appropriate amount of deionized water and stir evenly. Stir at 50°C for 2h to make a gel, dry the gel at 70°C for 12h, and grind Obtain solid powder after crushing;

[0100] C) Put the solid powder into a muffle furnace, raise the temperature to 400°C at a heating rate of 3°C / min and keep it for 2h...

Embodiment 2

[0104] This embodiment is a Si / SiO 2 / C composite nanofibrous material, its structure is the same as that in Example 1, the Si / SiO 2 The preparation method of / C composite nanofiber material is as follows:

[0105]A) 600 mL of deionized aqueous solution of polyvinyl alcohol (PVA) was configured according to a mass fraction of 10%, and stirred at 95° C. for 10 h to obtain an electrospinning solution;

[0106] B) Add 5g of lithium carbonate, 21.7g of sodium carboxymethylcellulose and 9.43g of nano-Si into an appropriate amount of deionized water and stir evenly, stir at 60°C for 3h to make a gel, and dry the gel at 80°C for 10h , to obtain solid powder after grinding and crushing;

[0107] C) Put the solid powder into a muffle furnace, raise the temperature to 450°C at a heating rate of 2°C / min and keep it for 1h to prepare Si / Li 4 SiO 4 Particles; the Si / Li 4 SiO 4 The particles were added to an appropriate amount of deionized water, heated to 96°C and stirred for 2 hours...

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Abstract

The invention provides a Si / SiO2 / C composite nanofiber material, a preparation method thereof and an anode material, and relates to the field of battery materials. The Si / SiO2 / C composite nanofiber material is prepared from carbon nanofibers and Si / SiO2 particles, wherein the Si / SiO2 particles are located in the carbon nanofibers and are of a core-shell structure formed by coating Si particles with SiO2. With the adoption of the composite nanofiber material, the technical problem that cyclic stability of a battery is affected by the fact that a carbon coating layer is prone to separation fromsilicon and breakage in the conventional carbon coated silicon core-shell structured composite material can be solved, and structural stability of the silicon-carbon composite material is improved.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a Si / SiO 2 / C composite nanofibrous material and its preparation method and negative electrode material. Background technique [0002] In the era of rapid development of green energy technology and low-carbon economy, higher and higher requirements are put forward for the selection of anode materials for lithium-ion batteries. At present, the lithium-ion anodes used in commercial production are mainly graphite-based anode materials. However, the theoretical specific capacity of graphite is only 372mAh / g. The application development of batteries in the field of power batteries. Among many potential materials to replace graphite, the theoretical capacity reaches 4200mAh / g, and silicon has attracted more and more attention due to its unique advantages and potential. However, when the silicon material is used as the negative electrode of a lithium-ion battery, its volume expansion...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/386H01M4/48H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 尹壮
Owner 桑德新能源技术开发有限公司
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