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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 technology, battery electrodes, nanotechnology for materials and surface science, etc. Uniform distribution, affecting the fast charging performance and service life of lithium-ion batteries, etc.

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

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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, which seriously affects the fast charging performance and service life of lithium-ion batteries.

Method used

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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

[0043] 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 5 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

[0048] This embodiment provides a preparation process of a silicon-carbon negative electrode material for a lithium-ion battery. The weight of silicon accounts for about 3% of the total weight of the negative electrode material. It is completed based on the fluidized plasma vapor deposition furnace in Example 1. The specific preparation process includes the following steps :

[0049] S1. Put 93 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;

[0050] 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 The base material is transported to the negative plate 1, and the ...

Embodiment 3

[0055] This embodiment provides a preparation process for a silicon-carbon negative electrode material for lithium-ion batteries. The weight of silicon accounts for about 5% of the total weight of the negative electrode material. It is completed based on the fluidized plasma vapor deposition furnace in Example 1. The specific preparation process includes the following steps :

[0056] S1. Put 90kg 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;

[0057] S2. Power on the electric heating element, raise the temperature of the deposition furnace to 480°C, make the negative plate 1 in a vibrating working state, adjust the rotation of the feeding and stirring mechanism 5 to the speed required by the process, and stir the feeding mechanism 5 to transfer the powder under the negative plate 1 The base material is transp...

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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 deposited on the surface of the base material, the base material is a carbon material, and nano silicon is 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 and 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. According to the invention, the nano silicon is uniformly and firmly distributed on the carbon material through the fluidized flow of the base material in the deposition process, the problem that the nano silicon is agglomerated due to dissociation is solved, and the working performance of the battery can be effectively improved by using the nano silicon as the negative electrode material of the lithium ion battery.

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): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525C23C16/513C23C16/54B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C23C16/513C23C16/54H01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 言伟雄袁建陵
Owner 株洲弗拉德科技有限公司