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Lithium ion battery silicon-carbon negative electrode material, and preparation process and equipment thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in metal material coating process, battery electrodes, nanotechnology for materials and surface science, etc. Problems such as loose bonding and inability to prevent film formation

Inactive Publication Date: 2021-05-07
株洲弗拉德科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing silicon-carbon anode material preparation process generally adopts a high-energy milling process to prepare silicon oxide nanoparticles in silicon-carbon anode materials. Since nano-silicon oxides and carbon materials are both in a free state, the clustering phenomenon of nano-silicon oxides cannot be solved, resulting in nano Silicon oxide cannot be evenly distributed in carbon materials, and the combination of nano-silicon oxide particles and carbon is not tight or the adhesion is not strong. On the other hand, when the deposition amount of silicon is large, a separate flow state The chemical deposition process still cannot prevent silicon from forming a thin film on the surface of the substrate, which seriously affects the fast charging performance and service life of lithium-ion batteries.

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  • Lithium ion battery silicon-carbon negative electrode material, and preparation process and equipment thereof
  • Lithium ion battery silicon-carbon negative electrode material, and preparation process and equipment thereof
  • Lithium ion battery silicon-carbon negative electrode material, and preparation process and equipment thereof

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Embodiment 1

[0041] Such as figure 1 and 2 As shown, the present embodiment provides a fluidized plasma vapor deposition furnace. The furnace body 4 is provided with a feed port 4001 and a discharge port 4002. The electric heating element 5 is arranged outside the furnace body 4. Inside the furnace body 4 is provided The positive plate 3 and the negative plate 1, the positive plate 3 is arranged above the negative plate 1, a certain working distance is kept between the positive plate 3 and the negative plate 1, the plasma vapor deposition area is between the positive plate 3 and the negative plate 1, and the positive plate 3 and the negative plate 1 is a parallel space or an approximately parallel space, and the negative plate 1 is connected with a vibrating device, which has the function of vibrating material delivery. A stirring and feeding mechanism 2 is provided below the negative plate 1, wherein the stirring and feeding mechanism can be a vertical stirring and feeding mechanism or a...

Embodiment 2

[0047] This embodiment provides a preparation process for a silicon-carbon negative electrode material for lithium-ion batteries. The weight of silicon accounts for about 10% of the total weight of the negative electrode material. It is completed based on the fluidized plasma vapor deposition furnace in Example 1, and the time-sharing deposition is adopted , the specific preparation process includes the following steps:

[0048] S1. Put 85 kg of substrate into a fluidized plasma vapor deposition furnace, the substrate is artificial graphite particles, D50=15 μm, vacuumize the deposition furnace until the pressure in the furnace is 0.01 to 2 Torr;

[0049] S2. Power on the electric heating element, raise the temperature of the deposition furnace to 500°C, put the negative plate 1 in a vibrating working state, adjust the speed of the feeding and stirring mechanism 5 to the speed required by the process, and stir and feed the powder under the negative plate 1 Transported to the n...

Embodiment 3

[0054] This embodiment provides a preparation process for a silicon-carbon negative electrode material for a lithium-ion battery. The weight of silicon accounts for about 20% of the total weight of the negative electrode material. It is completed based on the fluidized plasma vapor deposition furnace in Example 1, and the time-sharing deposition mode is adopted. , the specific preparation process includes the following steps:

[0055] S1. Put 70kg of base material into a fluidized plasma vapor deposition furnace, the base material is natural flake graphite particles, D50=11 μm, vacuumize the deposition furnace until the pressure in the furnace is 0.01-2 Torr;

[0056] S2. Power on the heating element, raise the temperature of the deposition furnace to 500°C, put the negative plate 1 in a vibrating working state, adjust the speed of the stirring and feeding mechanism 5 to the speed required by the process, and the stirring and feeding mechanism 5 will put the powder under the ne...

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Abstract

The invention discloses a lithium ion battery silicon-carbon negative electrode material, and a preparation process and equipment thereof. The negative electrode material comprises a base material, and nano silicon and nano carbon which are mixed and deposited on the surface of the base material, the base material is a carbon material, and the nano silicon and the nano carbon are mixed and deposited on the surface of the base material through a plasma enhanced chemical vapor deposition process. In the plasma enhanced chemical vapor deposition process, the base material is in a fluidized motion state in a deposition area, the plasma enhanced chemical vapor deposition process is carried out in a fluidized plasma vapor deposition furnace, and a positive plate, a negative plate and a stirring feeding mechanism are arranged in the fluidized plasma vapor deposition furnace. And the base material does fluidized circulating motion in the deposition area under the vibration action of the negative plate and the action of the stirring and feeding mechanism. Nano carbon and nano silicon are mixed and deposited on the surface of the base material, and a carbon coating layer is formed on the surface of the nano silicon, so that the performance of the silicon-carbon negative electrode material is improved.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, and more specifically, to a silicon carbon negative electrode material for lithium ion batteries and a preparation process and equipment thereof. Background technique [0002] Lithium-ion battery is a relatively mature secondary battery. With the continuous progress and development of society, people have higher and higher requirements for lithium-ion battery anode materials. Traditional graphite-based anode materials have a capacity close to 372mAh / g. Capacity, can no longer meet the miniaturization requirements of electronic equipment and the high power and high energy density requirements of vehicle batteries. Silicon carbon anode material is an advanced lithium-ion battery anode material that can replace graphite anode materials, and its market share is growing rapidly. [0003] The existing silicon-carbon anode material preparation process gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525C23C16/513C23C16/54B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C23C16/513C23C16/54H01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 言伟雄袁建陵
Owner 株洲弗拉德科技有限公司