Silicon-containing composite material and preparation method and application thereof

A technology of silicon composite materials and silicon particles, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of high cost and complex synthesis process, and achieve low production cost, fast preparation method, and high charge and discharge capacity Effect

Active Publication Date: 2017-03-22
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that silicon nanoparticles can form covalent bonds in graphene oxide. Many studies usually use nano-silicon particles directly as precursors to make electrodes, but the use of extremely small silicon nanoparticles is expensive and the synthesis process is complicated.
Therefore, the use of silicon with a large particle size to prepare battery materials remains to be explored

Method used

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  • Silicon-containing composite material and preparation method and application thereof
  • Silicon-containing composite material and preparation method and application thereof
  • Silicon-containing composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 1. Preparation of phytic acid-coated silicon nanoparticles

[0062] In an argon-filled glove box, commercially purchased micron-sized silicon powder (purchased from Aladdin, 40-200 mesh) and 6 stainless steel balls (two steel balls with a diameter of 14.3 mm and four steel balls with a diameter of 11.1 mm ) into a stainless steel bottle (100 mL), the mass ratio of steel balls to silicon powder is 20:1, and then use a SPEX-8000 high-energy ball mill at room temperature for 10 hours to collect the obtained silicon powder, and the grinding yield ( The ratio of powder mass after grinding to that before) is over 90%. In an argon atmosphere, mix 0.6g of ball-milled silicon powder with 0.4mL of phytic acid solution (50wt%), ball mill for 10h, and dry at 80°C for 10h under vacuum to obtain 0.88853g of silicon-phytic acid particles. The yield 98%. According to thermogravimetric analysis, the mass ratio of silicon to phytic acid in the silicon-phytic acid particles is 9:1. Beca...

Embodiment 2

[0078] According to the steps similar to Example 1, the amount of silicon powder after grinding is 0.3g, and the amount of 50wt% phytic acid solution is 0.4mL. Through thermogravimetric analysis, the mass ratio of silicon and phytic acid in silicon-phytic acid particles is 5 :1. The dosage of silicon-phytic acid particles is 6 mg, the dosage of graphene oxide is 3 mg, and the dosage of carbon nanotubes is 1 mg. The graphene used is single-layer graphene; the carbon nanotube used is single-walled carbon nanotube. The time for ball milling is 6 hours, the time for the first ultrasonic wave is 12 minutes, and the time for the second ultrasonic wave is 10 minutes.

Embodiment 3

[0080] According to the steps similar to Example 1, the amount of silicon powder after grinding is 2.0g, and the amount of 50wt% phytic acid solution is 0.4mL. Through thermogravimetric analysis, the mass ratio of silicon and phytic acid in the silicon-phytic acid particles is 20 :1. The amount of silicon-phytic acid particles is 78 mg, the amount of graphene oxide is 20 mg, and the amount of carbon nanotubes is 1 mg. The graphene used is multilayer graphene; the carbon nanotubes used are double-walled carbon nanotubes. The time for ball milling is 25 hours, the time for the first ultrasonic wave is 50 minutes, and the time for the second ultrasonic wave is 55 minutes.

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Abstract

The invention belongs to the field of a silicon-containing negative electrode material of a battery, and discloses a silicon-containing composite material and a preparation method and an application thereof. The silicon-containing composite material comprises silicon particles, phytic acid, graphene oxide and carbon nanotubes, wherein the surfaces of the silicon particles are coated with the phytic acid to form silicon-phytic acid particles; and the silicon-phytic acid particles, and the graphene oxide and carbon nanotubes are crosslinked to form a 3D network structure. The preparation method mainly adopts ball milling and freezing and drying processes. The silicon-containing composite material provided by the invention can be used for a lithium ion battery or a sodium ion battery, is high in charge-discharge capacity and cycling stability, has readable and writable, and printable features, and has quite high application prospect in the energy storage field; and in addition, the silicon-containing composite material provided by the invention has low production cost, rapid preparation method, and simplicity and feasibility.

Description

technical field [0001] The invention belongs to the field of silicon-containing negative electrode materials for batteries, and in particular relates to a silicon-containing composite material and a preparation method and application thereof. Background technique [0002] High energy density and long cycle life are crucial for rechargeable lithium-ion and sodium-ion batteries, which are the solution to various technological applications (e.g., portable electronic devices, hybrid and pure electric vehicles, grid-scale energy storage systems) The key to increased energy storage needs. [0003] The negative electrode material of traditional lithium-ion batteries is graphite, and the theoretical capacity is only 370mAh g -1 , cannot meet the high energy demand. Silicon is abundant in nature, and it is safe and environmentally friendly, which has attracted more and more attention from researchers. Theoretically, the specific capacity of silicon can reach 4200mAh·g -1 , the dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525H01M10/054
CPCH01M4/362H01M4/386H01M4/583H01M10/0525H01M10/054Y02E60/10
Inventor 卢周广吕富聪孙志方王文浠
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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