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A preparation method and a device for a high-performance silicon-carbon-based negative electrode material

A technology of negative electrode material and carbon-based material, applied in battery electrodes, electrical components, circuits, etc., can solve the problem that the C coating cannot achieve the coating effect, affect the construction of the carbon coating on the particle surface, and cannot be effectively coated and other problems, to achieve the effect of shortening the preparation cycle, avoiding breakage and multiple coating processes, and good electrochemical performance.

Active Publication Date: 2019-01-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Static accumulation of granular materials, silicon or silicon oxide powders are easy to gather together during the chemical vapor deposition process, causing serious agglomeration, which affects the construction of the carbon coating on the particle surface
[0005] 2. With static deposition, only a layer of sediment is attached to the surface of the deposition receptor, resulting in uneven coating, and the support surface of the granular material cannot be effectively coated. The coating consistency is poor and cracks are prone to appear, thus affect the properties of the material
[0006] The above two aspects cause the C coating to fail to achieve the coating effect, which affects the performance of the material

Method used

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  • A preparation method and a device for a high-performance silicon-carbon-based negative electrode material
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  • A preparation method and a device for a high-performance silicon-carbon-based negative electrode material

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Embodiment 1

[0061] See attached figure 1 , the present invention is a device for preparing high-performance silicon-carbon-based negative electrode materials, the device is a fluidized bed vapor deposition furnace, and the fluidized bed vapor deposition furnace includes a vapor deposition chamber 9, a sieve baffle 6, a fluidized Gas source 2 , heating buffer tank 4 , vibrating assembly 7 , tailings recoverer 11 and gas collection assembly 12 .

[0062] The fluidized gas source 2 is input to the vapor deposition chamber 9, and a two-layer mesh baffle 6 is arranged on the channel of the fluidized gas source 2, and the fluidized gas that matches the position of the mesh baffle 6 The channel of the source 2 is provided with a material port 8, the inner wall of the vapor deposition chamber 9 is provided with a first heating assembly 10, the sieve baffle 6 can effectively support the precursor, and the fluidization gas source 2 passes through the micropores to make The precursor is in a fluidi...

Embodiment 2

[0067] The invention relates to a device for preparing a high-performance silicon-carbon-based negative electrode material. The device is a fluidized bed vapor deposition furnace, and the fluidized bed vapor deposition furnace includes a vapor deposition chamber, a mesh baffle and a fluidized gas source.

[0068] The fluidized gas source is input into the vapor deposition chamber, and a three-layer sieve baffle is provided on the channel of the fluidized gas source, and a three-layer sieve baffle is arranged on the channel of the fluidized gas source that matches the position of the sieve baffle. The material port, the inner wall of the vapor deposition chamber is provided with a first heating assembly. The sieve baffle can effectively support the precursor, and the fluidized gas source passes through the micropores to make the precursor fluidized and suspended in the vapor deposition chamber for coating.

Embodiment 3

[0070] The present invention is a device for preparing high-performance silicon-carbon-based negative electrode materials. The device is a fluidized bed vapor deposition furnace, and the fluidized bed vapor deposition furnace includes a vapor deposition chamber, a sieve baffle, a fluidizing gas source and Heat the buffer tank.

[0071] The fluidized gas source is input to the vapor deposition chamber, four layers of sieve baffles are arranged on the channel of the fluidized gas source, and a four-layer sieve baffle is arranged on the channel of the fluidized gas source matching the position of the sieve baffle. There is a material port, and the inner wall of the vapor deposition chamber is provided with a first heating assembly. The sieve baffle can effectively support the precursor, and the fluidized gas source passes through the micropores to make the precursor fluidized and suspended in the vapor deposition chamber for coating.

[0072] The buffer heating tank is arranged ...

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Abstract

The invention belongs to the field of negative electrode materials of lithium ion batteries, and in particular discloses a preparation method and a device for a high-performance silicon-carbon-based negative electrode material. A silicon-based material and a carbon-based material are uniformly mixed to obtain a precursor; the precursor is in fluidized state and chemical vapor deposition is carriedout to obtain a silicon-carbon-based cathode material. According to the preparation method, a vibration fluidization vapor deposition system is adopted to perform carbon coating construction on a silicon-carbon-based material, first material particles are fluidized and suspend in a vapor phase, and then the surface of the material particles is uniformly coated with a carbon layer at 360 DEG by achemical vapor deposition technology, so that the coated carbon layer is uniform, compact and good in consistency. The silicon-carbon-based negative electrode material has high reversible specific capacity and high first-time coulomb efficiency, showing excellent conductivity and good cycling stability.

Description

technical field [0001] The invention relates to the field of lithium-ion battery negative electrode materials, in particular to a preparation method and device for a high-performance silicon-carbon-based negative electrode material. Background technique [0002] The anode material of traditional commercial lithium-ion batteries is usually graphite, which is widely used in portable electronic devices such as computers, mobile phones, and digital cameras, as well as energy storage such as wind energy, water energy, and tidal energy. But with the development of the times, and its pollution-free, light weight, no memory effect and other advantages make it one of the current hot spots. But with the development of the times, it can no longer meet people's needs, because the specific capacity of graphite is only 372mAh / g, which limits its application in other fields such as electric vehicles. Therefore, to develop high specific capacity and long cycle life, Lithium-ion battery ano...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/386H01M4/625Y02E60/10
Inventor 夏茂张红波熊翔
Owner CENT SOUTH UNIV
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