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A carbon-coated nano-silicon composite material and its preparation method and application

A composite material, carbon-silicon composite technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as high cost and complex preparation process, achieve resource recovery, simple process, improved Effects of Cyclic Stability

Active Publication Date: 2019-09-24
吕铁铮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problems of complex preparation process and high cost of the existing method for reducing the volume effect of silicon-based negative electrode materials by using nanometerization, alloying or porosity, and provides a carbon-coated nano-silicon composite material and its Preparation method and application

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  • A carbon-coated nano-silicon composite material and its preparation method and application
  • A carbon-coated nano-silicon composite material and its preparation method and application
  • A carbon-coated nano-silicon composite material and its preparation method and application

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specific Embodiment approach 1

[0020] Embodiment 1: The carbon-coated nano-silicon composite material in this embodiment is a powder of a core-shell structure with nano-silicon particles as the content and carbon as the outer shell.

specific Embodiment approach 2

[0021] Specific embodiment two: the preparation method of the carbon-coated nano-silicon composite material described in specific embodiment one is carried out according to the following steps:

[0022] 1. Put the micron-sized silicon powder with an oxide layer on the surface into an oxygen diffusion furnace, and carry out oxygen diffusion treatment at a temperature of 500-1300°C and a pressure of less than 1 atmosphere until the color of the silicon powder changes from black to earth. Yellow or tan, get silicon micropowder with nano-silicon embedded in silicon oxide;

[0023] 2. Carry out carbon-coating treatment to the silicon micropowder embedded in silicon oxide with the nano-silicon obtained in step 1 to form a carbon-silicon composite powder;

[0024] 3. Soak the carbon-silicon composite powder obtained in step 2 with a hydrofluoric acid solution to remove silicon oxide components, and wash and dry to obtain a carbon-coated nano-silicon composite material.

[0025] In t...

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 2 in that the ratio of silicon atoms to oxygen atoms in the micron-sized silicon powder with an oxide layer on the surface in step 1 is 1: (0.8-1.2). Others are the same as in the second embodiment.

[0027] In the micron-sized silicon micropowder with an oxidized layer on the surface of this embodiment, the degree of oxidation is relatively high, which is a precondition for the smooth progress of subsequent oxygen diffusion.

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Abstract

The invention relates to a carbon coated nanosilicon composite material as well as a preparation method and an application thereof. The invention relates to silicon composite powder as well as a preparation method and an application thereof. The invention aims to solve the technical problem that an existing method of reducing the volume effect of a silicon-based cathode material by virtue of nanocrystallization, alloying or porous forming is complex in preparation process and high in cost. The carbon coated nanosilicon composite material provided by the invention is powder of a core-shell structure taking nanosilicon particles as a content and carbon as a shell. The preparation method comprises the following steps: performing oxygen diffusion on nanoscale silicon micropowder with an oxidizing layer on the surface; then performing carbon coating treatment; and then soaking the same with a hydrofluoric acid solution to remove the component of silicon oxide to obtain the carbon coated nanosilicon composite material. The volume of the carbon coated nanosilicon composite material provided by the invention reaches 900mAh / g or above, attenuation after 150 times of cycles is smaller than 4%, and the material can be used as a lithium battery silicon cathode material.

Description

technical field [0001] The invention relates to a silicon composite powder and its preparation method and application. Background technique [0002] With the progress of society, greatly increasing the energy density of secondary rechargeable batteries is not only an urgent need for advanced portable electronic products such as smartphones and tablet computers, but also an urgent need for the development of new energy industries represented by electric vehicles and large-scale energy storage. . At present, lithium-ion batteries are mainly composed of current collector, positive electrode, negative electrode, diaphragm and electrolyte, while traditional negative electrode materials mainly include natural or artificial graphite and lithium titanate. The lithium storage capacity of traditional graphite is only 372mAh / g , and the silicon anode based on the alloying reaction is considered to be an ideal choice for the next generation of lithium-ion batteries because of its theor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/1395H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/1395H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 吕铁铮
Owner 吕铁铮
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