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Lithium battery silicon-carbon nanotube composite cathode material as well as preparation method and application thereof

A technology of nanotube composite and negative electrode material, which is applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve problems such as complex process, and achieve the effects of simple preparation process, alleviation of volume expansion effect, and low cost.

Inactive Publication Date: 2013-10-09
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the silicon-carbon composite material consists of carbon nanotubes and / or carbon nanofibers deposited on the surface of nano-silicon powder particles and / or embedded between nano-silicon powder particles to form a core, and the surface of the core is coated with a carbon layer. It needs to be pulverized and coated many times, and the process is complicated

Method used

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  • Lithium battery silicon-carbon nanotube composite cathode material as well as preparation method and application thereof
  • Lithium battery silicon-carbon nanotube composite cathode material as well as preparation method and application thereof
  • Lithium battery silicon-carbon nanotube composite cathode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] (1) Preparation of silicon-carbon nanotube composite negative electrode material for lithium battery, the specific steps are as follows:

[0047] (1) Weigh 14.25g of citric acid (C 6 h 8 o 7 ·H 2 O) and 0.05g nickel acetate (C 4 h 6 o 4 Ni·H 2 O) Dissolve in 100mL of absolute ethanol to obtain solution A; weigh 0.02g of dispersant polyvinylpyrrolidone, dissolve it in absolute ethanol, add it to 20g of nano-silicon liquid (silicon content is 2g), and sonicate for 30min to obtain solution B, Pour solution B into solution A to obtain a mixed slurry;

[0048] (2) Stir the mixed slurry obtained in step (1) for 1 hour at a stirring speed of 1000r / min, then add absolute ethanol to adjust the solid content of the mixed slurry to about 15% (mass), and mix The mixed slurry was pumped to the atomizer by a peristaltic pump for centrifugal closed cycle spray drying to obtain precursor A; the feed rate was 15mL / min, the inlet temperature was 105°C, the outlet temperature was ...

Embodiment 2

[0056] (1) Preparation of silicon-carbon nanotube composite negative electrode material for lithium battery, the specific steps are as follows:

[0057] (1) Weigh 2.85g phenolic resin and 0.05g nickel acetate (C 4 h 6 o 4 Ni·H 2 O) Dissolve in 100mL of absolute ethanol to obtain solution A; weigh 0.04g of dispersant polyethyleneimine and dissolve it in absolute ethanol, add it to 40g of nano-silicon liquid (4g of silicon content), and sonicate for 60min to obtain solution B , Pour solution B into solution A to obtain a mixed slurry;

[0058] (2) Stir the mixed slurry obtained in step (1) for 1 hour at a stirring speed of 1200r / min, then add absolute ethanol to adjust the solid content of the mixed slurry to about 20% (mass), and pass the mixed slurry through peristalsis Pumped to the atomizer for centrifugal closed cycle spray drying to obtain precursor A; wherein the feed rate is 15mL / min, the inlet temperature is 110°C, the outlet temperature is 82°C, and the atomizer sp...

Embodiment 3

[0065] (1) Preparation of silicon-carbon nanotube composite negative electrode material for lithium battery, the specific steps are as follows:

[0066] (1) Weigh 2.45g of high-temperature asphalt and 0.05g of iron acetate and dissolve them in tetrahydrofuran and absolute ethanol to obtain solution A; weigh 0.04g of dispersant polyetherimide and dissolve them in absolute ethanol and add them to 40g of nano silicon Liquid (silicon content is 4g), and ultrasonic 1.5h to obtain solution B, solution B is poured into solution A to obtain a mixed slurry;

[0067] (2) Stir the mixed slurry obtained in step (1) for 2 hours at a stirring speed of 800r / min, then add tetrahydrofuran to adjust the solid content of the mixed slurry to about 25% (mass), and pump the mixed slurry through a peristaltic pump To the atomizer for centrifugal closed cycle spray drying to obtain precursor A; wherein the feed rate is 15mL / min, the inlet temperature is 115°C, the outlet temperature is 85°C, and the ...

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Abstract

The invention discloses a lithium battery silicon-carbon nanotube composite cathode material as well as a preparation method and application of the lithium battery silicon-carbon nanotube composite cathode material. The preparation method of the lithium battery silicon-carbon nanotube composite cathode material comprises the following steps of: mixing and uniformly stirring an organic carbon source and nanometer silicon based on the mass ratio of (0.4-9): 1, adding a catalyst to obtain mixed slurry, drying by a closed circulation spray dryer to obtain a precursor, insulating the precursor for 1-5 hours at the temperature of 300-700 DEG C to obtain a sample, feeding the sample in a tube furnace, increasing the temperature to 500-900 DEG C under the mixed gas of gaseous organic carbon source and N2 and Ar2, and naturally cooling to obtain the lithium battery silicon-carbon nanotube composite cathode material. The lithium battery silicon-carbon nanotube composite cathode material has excellent electrochemical properties, high first charge-discharge efficiency up to more than 2000mAh / g, reversible specific capacity of about 1100mAh / g after cycle of 50 weeks, and good specific capacity and cycle performance, and the problems of low first efficiency, large irreversible capacity loss and poor conductivity of silicon when being used to prepare a lithium ion battery cathode are successfully solved.

Description

technical field [0001] The invention belongs to the field of lithium battery material preparation, and in particular relates to a lithium battery silicon-carbon nanotube composite negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become an ideal renewable energy source because of their high energy density, long cycle life, and environmental friendliness. Electrode materials are one of the key factors determining the overall performance of lithium-ion batteries. At present, commercialized carbon anode materials are close to their theoretical capacity (372mAh / g), and there is little room for improvement. Compared with carbon anode materials, the theoretical specific capacity of elemental silicon is as high as 4200mAh / g, so it has become a current research hotspot. . [0003] At present, the mechanism of lithium intercalation and desorption of silicon-based negative electrode materials is tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36B82Y40/00B82Y30/00H01M10/0525
CPCY02E60/10
Inventor 侯贤华王洁李敏胡社军张苗
Owner SOUTH CHINA NORMAL UNIVERSITY
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