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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, applied in metal material coating technology, battery electrodes, nanotechnology for materials and surface science, etc., can solve the problem of not being able to prevent the formation of thin films, affecting the fast charging performance and use of lithium-ion batteries Problems such as lifespan and imprecise combination of nano-silicon oxide particles

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

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Embodiment 1

[0040] Such as figure 1As 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. A positive electrode plate 3 and a negative electrode plate 1 are provided inside the furnace body 4. The positive electrode plate The number of 3 is more than 1, and each positive plate can be connected to the working gas and the plasma generator separately, the positive plate 3 is set above the negative plate 1, the positive plate 3 and the negative plate 1 maintain a certain working distance, the positive plate 3 and the Between the negative plates 1 is a plasma vapor deposition area, and between the positive plates 3 and the negative plates 1 is a parallel space or an approximately parallel space. A feed plate and a discharge plate are respectively connected between the negative plate 1 and the feed port 4001 and the discharge port 4002. The feed plate, the discharge plate and the negat...

Embodiment 2

[0048] 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 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 mode is adopted. , the specific preparation process includes the following steps:

[0049] S1. Put 85kg of base material into the hopper at the upper end of the feed port 4001 of the fluidized plasma vapor deposition furnace, and wait for the feed. The pressure is 0.01-2 Torr;

[0050] S2. Power on the electric heating element, raise the temperature of the deposition furnace to 500°C, put the feed plate, negative electrode plate 1 and discharge plate in the state of vibrating feeding, open the feed port 4001 and the discharge port 4002, and the substrate is flow-controlled Sequentially transported to the negative plate 1, and reach th...

Embodiment 3

[0055] 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 simultaneous deposition mode is adopted. Concrete preparation process comprises the following steps:

[0056] S1. Put 70kg of base material into the hopper at the upper end of the feed port 4001 of the fluidized plasma vapor deposition furnace, and wait for the feed. The base material is natural flake graphite particles, D50=11 μm. The internal pressure is 0.01-2 Torr;

[0057] S2. Power on the electric heating element, raise the temperature of the deposition furnace to 500°C, put the feed plate, negative electrode plate 1 and discharge plate in the state of vibrating feeding, open the feed port 4001 and the discharge port 4002, and the substrate is flow-cont...

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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 and a negative plate are arranged in the fluidized plasma vapor deposition furnace. The deposition area is arranged between the positive plate and the negative plate, the negative plate has a vibration material conveying function, and the base material does fluidized motion in the deposition area under the vibration action of the negative plate. 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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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