Method for preparing composite cathode material of silicon-carbon nanotube of lithium ion battery

A nanotube composite and lithium-ion battery technology, which is applied in the field of lithium-ion battery silicon-carbon nanotube composite anode material preparation, can solve the problems of easy-to-destroy raw material morphology and high energy consumption

Active Publication Date: 2015-05-13
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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Problems solved by technology

At present, researchers have obtained silicon-carbon nanotube composites by simple mechanical ball milling of multi-wall

Method used

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  • Method for preparing composite cathode material of silicon-carbon nanotube of lithium ion battery
  • Method for preparing composite cathode material of silicon-carbon nanotube of lithium ion battery
  • Method for preparing composite cathode material of silicon-carbon nanotube of lithium ion battery

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preparation example Construction

[0022] Please refer to figure 1 As shown, it shows a preparation process of a lithium-ion battery silicon-carbon nanotube composite negative electrode material preparation method of the present invention, including the following steps:

[0023] (1) Dispersion: Disperse nano-silicon, dispersant, carbon source and catalyst in a solvent, and ultrasonicate for 0.5-2 hours to obtain a mixed slurry. The mass ratio of carbon source and nano-silicon is 0.2-5:1, and the catalyst dosage is nanometer 0.5% to 2% of the mass of silicon, and the amount of dispersant is 0.5% to 1% of the mass of nano silicon; the particle size of the nano silicon is 50 to 200 nm; the dispersant is polyvinylpyrrolidone, polyethyleneimine or One or more of sodium lauryl sulfate; the carbon source is glucose, sucrose, phenolic resin, furfural resin or high-temperature pitch; the catalyst is nickel nitrate, nickel sulfate, ferric nitrate, ferrocene or nano One or more of iron; the solvent is one or more of abso...

Embodiment 1

[0029] (1) Dispersion: Disperse nano-silicon, dispersant, carbon source and catalyst in a solvent, and ultrasonicate for 0.5h to obtain a mixed slurry. The mass ratio of carbon source and nano-silicon is 0.2:1, and the amount of catalyst is 1 / 2 of the mass of nano-silicon. 0.6%, the amount of dispersant is 0.8% of the nano-silicon quality; in the present embodiment, the particle diameter of the nano-silicon is 100 nm; the dispersant is polyvinylpyrrolidone; the carbon source is glucose; the catalyst It is nickel nitrate; the solvent is absolute ethanol.

[0030] (2) Grinding: Grind the mixed slurry with a sand mill for 2.5 hours at a grinding speed of 1000 r / min, then add solvent to adjust the solid mass content of the mixed slurry to 30%;

[0031] (3) Drying: Dry the ground mixed slurry into powder using a spray dryer. The air inlet temperature of the spray drying is 220 ℃, the air outlet temperature is 145 ℃, and the rotation speed of the constant flow pump is 78r / min;

[0...

Embodiment 2

[0034] (1) Dispersion: Disperse nano-silicon, dispersant, carbon source and catalyst in a solvent, and ultrasonicate for 0.8h to obtain a mixed slurry. The mass ratio of carbon source and nano-silicon is 1.5:1, and the amount of catalyst is 1 / 2 of the mass of nano-silicon. 1.2%, the amount of dispersant is 0.7% of the nano-silicon quality; in the present embodiment, the particle diameter of the nano-silicon is 150 nm; the dispersant is polyethyleneimine; the carbon source is sucrose; The catalyst is nickel sulfate; the solvent is ethanol.

[0035] (2) Grinding: Grind the mixed slurry with a sand mill for 2 h at a grinding speed of 1200 r / min, then add a solvent to adjust the solid mass content of the mixed slurry to 20%;

[0036] (3) Drying: Dry the ground mixed slurry into powder using a spray dryer. The air inlet temperature of the spray drying is 150 ℃, the air outlet temperature is 115 ℃, and the rotation speed of the constant flow pump is 80r / min;

[0037] (4) Microwave he...

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Abstract

The invention discloses a method for preparing a composite cathode material of a silicon-carbon nanotube of a lithium ion battery. According to the method, firstly, the surface of nano silicon is coated with a carbon source, carbon nanotubes are generated in microwave treatment, and furthermore the surface of silicon is also coated with an introduced catalyst, so that the carbon nanotubes which are coated with the carbon source and are generated through catalytic cracking are very uniformly distributed on the surface of nano silicon, the problems that in the prior art the nano silicon is high in volume expansion effect, low in first charge/discharge efficiency and poor in circulation stability are solved, and both the conductivity and the mechanical property of the composite cathode material prepared by using the method disclosed by the invention are greatly improved and the circulation property, the multiplying power charge and discharge performance and the initial charge-discharge efficiency of the composite cathode material as a lithium lion battery cathode material are all greatly improved when being compared with those of a silicon-carbon nanotube cathode material which is mixed in a mechanical ball-milling manner as silicon and carbon nanotubes are compounded in an in-situ manner in the method disclosed by the invention. In addition, the method disclosed by the invention is simple in process, and the energy consumption is greatly reduced due to the adoption of a simple and efficient microwave chemical method.

Description

technical field [0001] The invention relates to the technology in the field of silicon-carbon materials, in particular to a method for preparing a silicon-carbon nanotube composite negative electrode material for a lithium-ion battery. Background technique [0002] At present, the anode materials of commercial lithium-ion batteries mainly use graphite materials, but the theoretical capacity of graphite materials is low (372 mAh / g), which cannot meet the needs of high specific capacity lithium ions. Silicon has attracted more and more attention because of its very high theoretical specific capacity (about 4200 mAh / g). It is considered to be one of the most likely materials to replace graphite anodes. However, silicon-based anodes have not been put into use for a long time. In commercial use. This is because silicon will experience about 300% volume expansion / contraction during the intercalation / delithiation process, and the huge volume change will cause the silicon electrode...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/1395B82Y40/00
CPCB82Y40/00H01M4/1393H01M4/1395H01M4/362H01M4/386H01M4/583H01M2004/027Y02E60/10
Inventor 宋宏芳赵东辉戴涛周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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