Preparation method of long-circulation silicon monoxide/carbon composite negative electrode material

A technology of silicon oxide and negative electrode materials, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of short cycle life of silicon-carbon composite negative electrode materials, unstable coating layer, long carbon coating time, etc. Achieve the effects of promoting rapid charge and discharge, high mechanical strength, and improving electrical conductivity

Active Publication Date: 2020-02-21
LANXI ZHIDE ADVANCED MATERIALS CO LTD
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Problems solved by technology

[0008] Aiming at the deficiencies of the prior art, the present invention provides a method for preparing a silicon-carbon composite negative electrode material, which solves the problem of poor electrical conductivity of the silicon-based material, long carbon coating time, unstable coating layer, and silicon-carbon composite negative electrode. The technical problem of short material cycle life

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  • Preparation method of long-circulation silicon monoxide/carbon composite negative electrode material
  • Preparation method of long-circulation silicon monoxide/carbon composite negative electrode material
  • Preparation method of long-circulation silicon monoxide/carbon composite negative electrode material

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Embodiment 1

[0055] 5 kg of SiO powder with a median diameter of D50 = 3 μm was evenly dispersed in a phosphoric acid solution with a concentration of 1 mol / L. After spray drying, it was heated to 900 ° C in a tube furnace and sintered at high temperature for 2 hours to obtain phosphorus-doped SiO powder. After being crushed by a jet mill, soak in kerosene, and inductively heat to 950°C in a CLVD furnace, while feeding nitrogen protection with a flow rate of 20L / min, and the deposition time is controlled at 3min. Kerosene is cracked at high temperature, and pyrolytic carbon is coated on the surface of nitrogen-doped SiO. Then mix it evenly with 1wt% ferrocene powder, soak it in kerosene, and heat it up to 950°C by induction in a CLVD furnace. At the same time, the flow rate is 20L / min nitrogen protection, and the deposition time is controlled at 2min. Kerosene is catalytically cracked to generate CNTs in situ on the outer surface of the carbon coating.

[0056] Using a jet mill, the parti...

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Abstract

The invention discloses a preparation method of a lithium ion battery negative electrode material, and particularly relates to a preparation method of a long-circulation silicon monoxide / carbon composite negative electrode material. The method comprises the following steps: doping, crushing, coating, catalytic cracking, crushing classification and impurity removing, thus obtaining a finished product. The conductivity of a silicon monoxide (SiO) body is improved through doping, and rapid charging and discharging are promoted. The surface of the doped SiO is quickly coated with a layer of compact pyrolytic carbon through a chemical liquid vapor deposition (CLVD) method. Carbon nanotubes (CNT) are quickly generated in situ on the outer layer of pyrolytic carbon through a catalytic CLVD method. Compared with the prior art, the SiO / C composite negative electrode material has the advantages of short carbon coating time, good stability and long cycle life, can meet the use requirements of lithium ion energy storage and power batteries, and is expected to replace the traditional graphite negative electrode material to realize large-scale industrial application.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion battery negative electrode materials, in particular to a preparation method of a high-first-efficiency silicon-carbon composite negative electrode material. Background technique [0002] Due to the presence of oxygen as a volume buffer in the lithium-deintercalation process, the silicon oxide composite material exhibits better volume effect and cycle performance than pure silicon-carbon composite anode materials, and has become the most likely to be applied on a large scale at present. Capacity negative electrode material. [0003] However, the conductivity of silicon oxide is poor, and there is still a volume effect that is much greater than that of traditional graphite anode materials. The negative electrode active material is pulverized during the process of deintercalating lithium, the SEI film is repeatedly formed, the irreversible capacity is increased, and the first coulombic effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 陈青华胡盼刘江平房冰肖旦汤志龙
Owner LANXI ZHIDE ADVANCED MATERIALS CO LTD
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