Preparation method of ferric oxide/carbon/carbon nanotube lithium-ion battery negative electrode material

A technology of ferric oxide and lithium-ion batteries, which is applied in the direction of carbon nanotubes, battery electrodes, secondary batteries, etc., can solve the problems of electrochemical performance, unsatisfactory cycle stability, poor conductivity, etc., and achieve improved cycle Stability, easy control of particle size, good dispersion effect

Active Publication Date: 2018-06-19
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Application Information

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Problems solved by technology

But its disadvantage is that it has the same poor conductivity as other transition oxides (2×10 4 s / m, 25°C), and with the intercalation and extraction of lithium ions, there is a volume change of up to ~200%, so its electrochemical performance, cycle stability, and rate performance are not ideal

Method used

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  • Preparation method of ferric oxide/carbon/carbon nanotube lithium-ion battery negative electrode material
  • Preparation method of ferric oxide/carbon/carbon nanotube lithium-ion battery negative electrode material
  • Preparation method of ferric oxide/carbon/carbon nanotube lithium-ion battery negative electrode material

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Embodiment 1

[0025] 1. Preparation of activated carbon nanotubes

[0026] (1) Weigh 1g of carbon nanotubes (CNT) (purified, particle size 30-50nm) and 4g of KOH (ratio: 1:4) with an electronic scale and put them into an agate mortar to grind and mix them evenly, then Then pour it into a 150ml beaker and add 100ml of distilled water to mix, and stir for 30min with a magnetic stirrer;

[0027] (2) drying the product obtained in step (1) in a drying oven at 100° C. in air for 24 hours, and evaporating all the water in the mixture to obtain a dried mixture;

[0028](3) Put the product obtained in step (2) into a horizontal tube furnace with a ceramic boat and feed nitrogen gas at 240ml / min, heat up to 850°C at a rate of 5°C / min and keep it warm for 1 hour, then cool to room temperature and take it out. Carbon nanotubes have been activated by KOH, and KOH is embedded in the tube wall of carbon nanotubes;

[0029] (4) Due to the existence of KOH, (3) the resulting carbon nanotubes are alkaline...

Embodiment 2

[0042] Others are the same as Example 1, and the difference is that the second step prepares Fe 2 o 3 In step (4) of the / CNT material, place it in a polytetrafluoroethylene reactor lining, and react in a constant temperature box at 210°C for 9 hours.

Embodiment 3

[0044] Others are the same as Example 1, and the difference is that the second step prepares Fe 2 o 3 In step (4) of the / CNT material, place it in a polytetrafluoroethylene reactor lining, and react for 9 hours at 230° C. in a thermostat.

[0045] figure 1 It is the obtained ferric oxide / carbon / carbon nanotube (Fe 2 o 3 / CNT) low-magnification SEM images. It can be seen from the XRD pattern that Fe was successfully synthesized by the hydrothermal method 2 o 3 Composite materials with carbon nanotubes

[0046] figure 2 It is the obtained ferric oxide / carbon / carbon nanotube (Fe 2 o 3 / C / CNT) XRD pattern. It can be seen from the SEM image that the carbon-coated iron oxide balls are evenly attached to the surface of the carbon nanotubes, which shows that we have successfully compounded the core-shaped iron oxide balls on the carbon nanotubes. On the surface of nanotubes, this composite material has good electrical conductivity, Coulombic efficiency and high capacity. ...

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Abstract

The invention provides a preparation method of a ferric oxide/carbon/carbon nanotube (CNT) lithium-ion battery negative electrode material. The preparation method comprises the following steps: step 1, after mixing carbon nanotubes and KOH powder, adding a mixture into distilled water; after stirring, drying and roasting to obtain activated carbon nanotubes; step 2, mixing a mixed solution of Fe(NO3)9 and C6H12O6 with an activated carbon nanotube dispersion solution, and reacting to obtain Fe2O3/C/CNT. According to the preparation method provided by the invention, carbon cladded ferric oxide nanoparticles and the carbon nanotubes are combined together, so that the disadvantages that the electric conductivity is low, the specific capacity is low and the coulombic efficiency is relatively low and the like when the carbon cladded ferric oxide nanoparticles are used as a lithium-ion battery negative electrode can be improved.

Description

technical field [0001] The present invention relates to lithium battery electrode materials, in particular to a Fe with high electrochemical performance 2 o 3 A preparation method of / C / CNT lithium ion battery negative electrode material. Background technique [0002] With the progress of society and the continuous development of science and technology, energy crisis and environmental pollution have gradually become important problems that plague the long-term sustainable survival and development of human beings. Energy is the material basis for human existence, the source of world economic growth and development, and an important indicator of the development of a country's civilization. Nowadays, due to the huge demand for energy in human society, the non-renewable energy in nature is facing exhaustion, which leads to great challenges in the development and application of energy. In this context, it is imminent to find new renewable green energy with high energy conversi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M4/62H01M10/0525C01B32/158
CPCH01M4/366H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 张永光钊妍王新
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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