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A kind of layered siox material and its preparation method and application

A layered, adjacent layer technology, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problem of no silicon oxide report, and achieve efficient and easy preparation methods, simple operation steps, and excellent electrochemical performance. Effect

Active Publication Date: 2022-05-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the first discharge of silicon oxide, electrochemically inert components (Li 2 O. Li x Si y O), these components can buffer the volume expansion of silicon, so it can help the material to obtain a more stable cycle life than simple silicon, and silicon oxide has a higher tap density than nano-silicon, so it has great potential in industrial applications. potential, but there is no report on 2D layered silicon oxide in the current patent literature

Method used

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  • A kind of layered siox material and its preparation method and application
  • A kind of layered siox material and its preparation method and application
  • A kind of layered siox material and its preparation method and application

Examples

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Embodiment 1

[0047] A kind of preparation method of layered SiOx material of the present embodiment, specific preparation steps are as follows:

[0048] (1) 2g CaSi 2 Slowly add 200ml of NaCl solution with a concentration of 10mol / L, and add 200ml of CH with a concentration of 8mol / L at a rate of 1ml / min at a stirring speed of 800r / min. 3 COOH, stirred for 3 days, sonicated at 80W for 1 hour, washed with deionized water for 4 times until the filtrate was neutral, and freeze-dried for 12 hours to obtain a green layered siloxene material;

[0049] (2) Weigh 1 g of siloxene material and heat it up to 400 °C at a rate of 5 °C / min in a tube furnace in an Ar atmosphere and keep it for 1 h. After cooling down to room temperature naturally, the layered SiOx material can be obtained.

[0050] The layered SiO material that the embodiment of the present invention 1 obtains is detected as follows below:

[0051] The SEM image of the layered SiOx material prepared in Example 1 of the present inventio...

Embodiment 2

[0063] A kind of preparation method of layered SiOx material of the present embodiment, specific preparation steps are as follows:

[0064] (1) 10g CaSi 2 Slowly add 500ml of AlCl with a concentration of 10mol / L 3 In the solution, add 1000ml of HNO with a concentration of 10mol / L at a rate of 2ml / min at a stirring speed of 1000r / min 3 , stirred and reacted for 4 days, sonicated at 80W for 2 hours, washed with deionized water for 4 times until the filtrate was neutral, and freeze-dried at -45°C for 12 hours to obtain a siloxene material;

[0065] (2) Weigh 5g of siloxene material and heat it up to 300°C at a rate of 2°C / min in a tube furnace under an Ar atmosphere and hold it for 2h. After cooling down to room temperature naturally, a layered SiOx material can be obtained.

[0066] The material that embodiment 2 obtains is carried out scanning electron microscope test, and result is as follows Figure 8 As shown, the SiOx material has a layered structure with a large number ...

Embodiment 3

[0068] A kind of preparation method of layered SiOx material of the present embodiment, specific preparation steps are as follows:

[0069] (1) 20g CaSi 2 Slowly add 400ml of NaCl solution with a concentration of 15mol / L, and add 500ml of CH with a concentration of 12mol / L at a rate of 0.5ml / min at a stirring speed of 500r / min. 3 CH 2 COOH, stirred for 4 days, sonicated at 100W for 3 hours, washed with deionized water for 4 times until the filtrate was neutral, and vacuum-dried at 100°C for 12 hours to obtain a siloxene material;

[0070] (2) Put the siloxene material in the tube furnace under H 2 Under the / Ar mixed atmosphere, the temperature was raised to 450 °C at a rate of 5 °C / min and kept for 1 h, and the SiOx material was obtained after cooling down to room temperature naturally.

[0071] The material that embodiment 3 obtains is carried out scanning electron microscope test, and result is as follows Figure 11 As shown, the SiOx material presents an accordion-like...

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Abstract

The invention discloses a layered SiOx material, which is an accordion-shaped layered micron-scale particle. The particle size of the SiOx material is 0.5-20 μm, and there are slits and gaps with a nanometer-scale width between any adjacent layers. The width of the slit gap is 1-50nm, and the thickness of a single sheet is 30-40nm; the preparation method is: dissolving CaSi 2 The Ca in the layered siloxene material is obtained; the hydrogen bond and hydroxyl group on the surface of the siloxene are removed by high-temperature calcination to obtain a SiOx material. The preparation process of the present invention is simple, the process is less, the requirements for equipment are not high, and it is easy to industrialize mass production, and the obtained 2D layered SiOx material can be directly used as the negative electrode material of lithium ion battery without coating, showing excellent electrochemical performance .

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a layered SiOx material and its preparation method and application. Background technique [0002] Lithium-ion batteries occupy a dominant position in the field of mobile electronic terminal equipment due to their outstanding advantages such as high energy density, high working voltage, good cycle performance, low self-discharge rate, and small environmental hazards. They are also ideal power sources for electric vehicles and large-scale energy storage. system. With the rapid development of portable electronic devices and electric vehicles, the demand and performance requirements for lithium-ion batteries have increased sharply, and lithium-ion batteries urgently need to develop in the direction of higher energy density. Anode materials are an important factor affecting the energy density of lithium-ion batteries. Graphite negative electrode material (theoretical capaci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/113H01M4/48H01M10/0525
CPCC01B33/113H01M4/483H01M10/0525C01P2002/72C01P2004/03C01P2004/04C01P2006/40H01M2004/021H01M2004/027Y02E60/10
Inventor 杜春雨任阳尹旭才霍华尹鸽平左朋建程新群马玉林高云智
Owner HARBIN INST OF TECH
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