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SiOx/carbon composite material and preparation method thereof, and lithium ion battery

A technology of carbon composite materials and magnesium ions, which is applied in the field of lithium-ion batteries, can solve the problems of cumbersome preparation process, fast capacity decay, and low initial capacity, and achieve the effects of simple process, alleviating powdering problems, and realizing resource utilization

Inactive Publication Date: 2019-08-02
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the current cumbersome preparation process of silicon-carbon anode materials, low initial capacity when used in lithium-ion batteries, fast capacity decay, and poor cycle performance, the invention provides a SiO x / Carbon composite material and preparation method thereof

Method used

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  • SiOx/carbon composite material and preparation method thereof, and lithium ion battery
  • SiOx/carbon composite material and preparation method thereof, and lithium ion battery
  • SiOx/carbon composite material and preparation method thereof, and lithium ion battery

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preparation example Construction

[0028] Examples of the present invention provide a SiO x A method for preparing a carbon composite material, at least comprising the following steps:

[0029] Step S01. Under ball milling conditions, perform ball milling treatment on silicon dioxide and magnesium powder, so that the silicon dioxide and magnesium powder undergo a magnesia thermal reaction. After the ball milling treatment is completed, wash with hydrochloric acid until no magnesium ions are detected in the eluate , and washed to neutral with deionized water to obtain SiO x ;

[0030] Step S02. SiO x , lignin, iron source and organic solvent for mixing and ultrasonic treatment to obtain SiO x / carbon precursor;

[0031] Step S03. the SiO x / The carbon precursor is placed in a reducing atmosphere for calcination, so that the iron source is reduced to iron, and the iron plays a catalytic role in the carbonization process of the lignin, so that the degree of graphitization of the lignin during carbonization ...

Embodiment 1

[0062] A SiO x / carbon composite material, adopt the following steps to prepare:

[0063] (a) Get ball milling beads, diatomite, and magnesium powder with a diameter of 10mm, wherein the ball-to-material ratio is 20:1, and the ratio of diatomite to magnesium powder is 1:1, and ball milling is carried out together, and the ball milling time is 45min. obtain the first product;

[0064] (b) washing the first product with hydrochloric acid with a concentration of 1 mol / L until no magnesium ions are detected in the eluate, then continuing to wash with deionized water until neutral, and then drying at 80°C, Get SiO x ;stand-by.

Embodiment 2

[0066] A SiO x / carbon composite material, adopt the following steps to prepare:

[0067] (a) Get ball milling beads, diatomite, and magnesium powder with a diameter of 10mm, wherein the ball-to-material ratio is 20:1, and the ratio of diatomite to magnesium powder is 1:1, and ball milling is carried out together, and the ball milling time is 45min. obtain the first product;

[0068] (b) Wash the first product with hydrochloric acid with a concentration of 1.0 mol / L until no magnesium ions are detected in the eluate, then continue washing with deionized water until neutral, and then dry at 80°C , to obtain SiO x ;

[0069] (c) with 5g alkali lignin, the SiO that 5g step (b) obtains x , 1.25g ferrous sulfate heptahydrate, and 500g tetrahydrofuran are placed in a beaker with a volume of 1000mL for mixing treatment, and an ultrasonic cell pulverizer is used for ultrasonic treatment to obtain SiO x / carbon precursor solution;

[0070] (d) step (c) to obtain SiO x / carbon ...

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Abstract

The invention provides a preparation method of a SiOx / carbon composite material. The method comprises steps that silica and magnesium powder are subjected to ball milling under ball milling conditions, the silica and the magnesium powder are subjected to magnesium thermal reaction, washing is then performed with hydrochloric acid till no magnesium ions are detected in the eluate, washing with thedeionized water is performed till the solution is neutral, and SiOx is obtained; the SiOx, lignin, iron source and organic solvent are mixed and sonicated to obtain SiOx / carbon precursor; the SiOx / carbon precursor is placed in a reducing atmosphere for calcination treatment, the iron source is reduced to iron, moreover, the iron plays a catalytic role in the carbonization process of lignin, the graphitization degree of the lignin is increased upon carbonization, the acid solution is utilized for several washing treatments, the iron is removed, and the SiOx / carbon composite material is obtained. The method is advantaged in that the SiOx / carbon composite material obtained by the method can improve electrochemical performance of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, in particular to a SiO x / Carbon composite material and preparation method thereof, lithium ion battery. Background technique [0002] Because of its high specific capacity (theoretical specific capacity at room temperature is 3580mAh / g), low delithiation potential, and low cost, silicon is considered to be a negative electrode material for the next generation of lithium-ion batteries. However, the large-scale use of silicon anode materials should solve two key problems: (a) particle pulverization, shedding and electric shock caused by volume expansion and contraction (shrinkage rate exceeding 300%) when silicon particles deintercalate lithium. Chemical performance failure; (b) The continuous growth of the solid electrolyte layer (SEI) on the silicon particle surface leads to the irreversible consumption of the electrolyte as well as the lithium source from the cathode. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/483H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 邓永红吴唯王曼王若徐东伟杜磊磊罗超张田
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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