Lamellar silicon oxide and carbon and cobalt oxide composite material and preparation method thereof

A technology of silicon oxide and cobalt monoxide, which is applied in the field of preparation of silicon-based nanocomposite materials, can solve the problems of difficulty in realizing industrialized production, affecting the performance of electrode materials, unstable material structure, etc., and achieves low cost and short preparation period. , the effect of high yield

Inactive Publication Date: 2018-11-02
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the overly complicated hydrothermal steps lead to unstable material structure and high preparation cost, making it difficult to realize industrial production
Moreover, the carbon content of the carbon source coated by the hydrothermal method is not easy to control, and excessive coating will affect the performance of the overall electrode material, making the capacity not high
Too little coating will affect the overall stability of the material

Method used

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  • Lamellar silicon oxide and carbon and cobalt oxide composite material and preparation method thereof
  • Lamellar silicon oxide and carbon and cobalt oxide composite material and preparation method thereof
  • Lamellar silicon oxide and carbon and cobalt oxide composite material and preparation method thereof

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preparation example Construction

[0040] According to a non-limiting embodiment of the present invention, a method for preparing a sheet-like silicon oxide and carbon-cobalt monoxide composite material is provided, the method comprising the following steps.

[0041] (1) Add silicon monoxide and graphite powder with a mass ratio of 0.1 to 0.5:1 into a ball mill jar, vacuum seal, place the ball mill jar in a high-energy ball mill, and mill for 15 to 28 hours to obtain a uniform and stable suspension. The suspension was dried in vacuo to obtain silicon oxide / carbon nanoparticles.

[0042] (2) Disperse the cobalt nitrate hexahydrate particles into the solvent to form a cobalt nitrate hexahydrate solution, disperse the silicon oxide / carbon nanoparticles prepared in step (1) into the cobalt nitrate hexahydrate solution, and stir magnetically at a constant temperature for 4-8 A suspension is formed within hours, wherein the mass ratio of cobalt nitrate hexahydrate particles to the solvent is 1:15-100, the solvent inc...

Embodiment 1

[0048] First, weighing silicon monoxide and graphite powder with a mass ratio of 0.1:1 is placed in an agate ball mill jar, wherein the mass ratio of the ball mill beads to the added substance is 20:1, and 20 milliliters of ethanol is added in the ball mill jar for Provide a liquid environment to make the ball mill more fully. Transfer the ball ink tank to a vacuum glove box for storage to provide vacuum conditions. After the sealing is completed, put it into the ball mill and mill it for 15 hours. Pour out the suspension obtained from the ball mill from the ball mill tank , placed in a petri dish, and the suspension was placed in a vacuum drying oven, and dried in vacuum at 60 degrees Celsius for 10 hours to obtain silicon oxide / carbon nanoparticles.

[0049] Next, disperse the prepared silicon oxide / carbon nanocomposite into the cobalt nitrate hexahydrate solution added with urea and cetyltrimethylammonium chloride, and then ultrasonically clean the mixture for 40 minutes, fo...

Embodiment 2

[0054] Except in step 1, ball milling time is 20 hours, all the other are identical with embodiment 1.

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Abstract

The invention discloses a lamellar silicon oxide and carbon and cobalt oxide composite material and a preparation method thereof. The method comprises: preparing a silicon oxide / carbon nanostructure by ball milling of silicon oxide and graphite powder, dispersing the ball milled silicon oxide / carbon nano-product into a cobalt nitrate hexahydrate solution for magnetic stirring for 4 to 8 hours to form a suspension, wherein the mass ratio of silicon oxide / carbon to cobalt nitrate hexahydrate is 0.05-0.4: 2.5; performing hydrothermal reaction on the resulting suspension at 120 to 180 degrees centigrade for 8 to 12 hours; cooling the reaction liquid to room temperature, obtaining the silicon oxide / carbon-oxidation cobalt composite after the precipitate obtained by the hydrothermal reaction isfiltered, centrifuged, and dried; and calcining the dried silicon oxide / carbon-cobalt oxide composite at the temperature of 320 to 660 degrees centigrade for 1.5 to 5 hours to obtain the silicon oxide / carbon-cobalt oxide composite material.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a preparation method of a silicon-based nanocomposite material with a layered structure. Background technique [0002] The theoretical capacity of commercially used graphite anode materials is limited, and it is difficult to meet the increasing energy demand of various consumer electronic devices. The development of new high-capacity lithium-ion batteries has put forward higher requirements for the specific capacity of lithium-ion battery anode materials. Silicon materials and transition metal cobalt compounds are the most competitive candidates for negative electrode materials in lithium-ion batteries. Because of their low cost, environmental friendliness, high theoretical specific capacity, and good safety, they have been widely used in the past decade. researcher's focus. [0003] Compared with the current commercially used graphite-based anode materials fo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/523H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 赵灵智王璞
Owner SOUTH CHINA NORMAL UNIVERSITY
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