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Method for preparing titanium niobate and carbon nanotube composite material and lithium ion capacitor with material as negative electrode

A technology of carbon nanotubes and composite materials, which is applied in the field of electrochemical material preparation and energy, can solve the problems of low electronic conductivity and restricted applications, and achieve the effects of high working voltage, uniform distribution, and simple production process

Active Publication Date: 2015-04-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Titanium niobate (TiNb) with a layered monoclinic structure was recently proposed by the Goodenough group 2 o 7 ) is a new type of lithium-ion battery anode material with a theoretical capacity of 387.6 mAh g -1 , there are 5 electron transfer reactions during charge and discharge (Ti 4+ / Ti 3+ , Nb 5+ / Nb 3+ ), which is twice that of the LTO material, and the charge and discharge potential is not much different, which can effectively avoid the formation of solid electrolyte interfacial film (SEI), ensure the safety of the electrode and a long cycle life, however, TiNb 2 o 7 The intrinsic electronic conductivity of the material is not high, which restricts its application in actual production

Method used

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  • Method for preparing titanium niobate and carbon nanotube composite material and lithium ion capacitor with material as negative electrode
  • Method for preparing titanium niobate and carbon nanotube composite material and lithium ion capacitor with material as negative electrode
  • Method for preparing titanium niobate and carbon nanotube composite material and lithium ion capacitor with material as negative electrode

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Experimental program
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Effect test

Embodiment 1

[0029] At room temperature, 1 mmol of niobium pentachloride and 2 mmol of isopropyl titanate were added to 20 mL of ethanol to disperse and mix, after stirring for 30 min, 230 mg of carbon nanotubes were added, and after stirring again for 30 min, the The mixed solution was poured into the inner lining of the reactor for solvothermal reaction. The reaction temperature was 200 °C, and the holding time was 24 h. After the reaction was completed and cooled to room temperature, the product was subjected to centrifugal drying treatment. 10 h. Afterwards, the dried samples were placed in a porcelain boat for two-step roasting treatment, the first roasting temperature was 300 °C, and the heating rate was 2 °C·min -1 , the holding time was 2 h, the sintering atmosphere was air; the second firing temperature was 700 °C, and the heating rate was 3 °C·min -1 , the holding time was 2 h, and the sintering atmosphere was nitrogen.

[0030] figure 1 XRD pattern of the titanium niobate / car...

Embodiment 2

[0038] At room temperature, 1 mmol of niobium pentachloride and 2 mmol of isopropyl titanate were added to 20 mL of dimethyl sulfoxide to disperse and mix. After stirring for 30 min, 230 mg of carbon nanotubes were added and stirred again for 30 min. After 1 min, the mixed solution was poured into the lining of the reactor for solvothermal reaction. The reaction temperature was 200 °C, and the holding time was 24 h. After the reaction was completed and cooled to room temperature, the product was subjected to centrifugal drying at 60 °C. , and the drying time was 10 h. Afterwards, the dried samples were placed in a porcelain boat for two-step roasting treatment, the first roasting temperature was 300 °C, and the heating rate was 2 °C·min -1 , the holding time was 2 h, the sintering atmosphere was air; the second firing temperature was 700 °C, and the heating rate was 3 °C·min -1 , the holding time was 2 h, and the sintering atmosphere was nitrogen.

Embodiment 3

[0040] At room temperature, add 1 mmol of niobium ethoxide and 2 mmol of isopropyl titanate into 20 mL of dimethyl sulfoxide to disperse and mix, stir for 30 min, add 230 mg of carbon nanotubes, and stir again for 30 min Finally, the mixed solution was poured into the inner lining of the reactor for solvothermal reaction, the reaction temperature was 200 °C, and the holding time was 24 h. After the reaction was completed and cooled to room temperature, the product was subjected to centrifugal drying treatment, and the drying temperature was 60 °C. The drying time is 10 h. Afterwards, the dried samples were placed in a porcelain boat for two-step roasting treatment, the first roasting temperature was 300 °C, and the heating rate was 2 °C·min -1 , the holding time was 2 h, the sintering atmosphere was air; the second firing temperature was 700 °C, and the heating rate was 3 °C·min -1 , the holding time was 2 h, and the sintering atmosphere was nitrogen.

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Abstract

The invention provides a method for preparing a titanium niobate and carbon nanotube composite material and a lithium ion capacitor with the material as the negative electrode. The composite material is obtained in the mode that a titanium source, a niobium source and carbon nanotubes are added to be mixed, solvent thermal treatment is performed, and the mixture is dried and baked in two steps. The production process is simple, and the material is easy to being produced on a large scale. The obtained titanium niobate and carbon nanotube composite material increases the product specific surface area and improves overall electric conductivity. The capacitor manufactured with the composite material as the negative electrode is high in work voltage and long in cycle life, the specific energy of the capacitor is far higher than that of a common electro-chemical capacitor and can be above 50 Wh.Kg-1, and high practical value is achieved.

Description

technical field [0001] The invention relates to the fields of electrochemical material preparation and energy fields, in particular to a preparation method of a titanium niobate / carbon nanotube composite material and a lithium ion capacitor using the material as a negative electrode. Background technique [0002] With the continuous development of the world economy, the depletion of fossil energy, the intensification of environmental pollution, and the increasingly significant global greenhouse effect, the development of new energy development, environmental protection, energy conservation and emission reduction has become an extremely important and urgent issue for human beings. Chemical energy storage devices are an important part of the energy system, among which electrochemical supercapacitors and lithium-ion batteries have attracted much attention due to their excellent performance. [0003] With the development of hybrid electric vehicles and the demand for energy ...

Claims

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Application Information

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IPC IPC(8): H01G11/50H01G11/06
CPCY02E60/13H01G11/06H01G11/24H01G11/36H01G11/50H01G11/86
Inventor 张校刚李洪森申来法
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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