Preparation method for carbon-coated super-long titanium dioxide nanotube negative electrode material of lithium ion battery

A lithium-ion battery, titanium dioxide technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as shortening the diffusion distance between lithium ions and electrons, and achieve good electrochemical performance, excellent The effect of improving the rate property and crystallinity

Inactive Publication Date: 2016-03-16
OCEAN UNIV OF CHINA
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  • Application Information

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Problems solved by technology

[0005] In order to overcome the above-mentioned defects in the prior art, a simple and environment-friendly method for preparing titanium dioxide nanotubes with highly conductive phase materials for lithium-ion battery anode materials is provided. The strength suppresses the expansion of the tube structure and carbonizes itself into amorphous carbon, thereby obtaining well-crystallized titanium dioxide nanotubes uniform

Method used

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  • Preparation method for carbon-coated super-long titanium dioxide nanotube negative electrode material of lithium ion battery
  • Preparation method for carbon-coated super-long titanium dioxide nanotube negative electrode material of lithium ion battery
  • Preparation method for carbon-coated super-long titanium dioxide nanotube negative electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] During operation, first weigh 1g of P25 powder and disperse evenly in 50mL of 10mol / L sodium hydroxide aqueous solution, stir for 2.5h, then place the mixed solution in the lining of a polytetrafluoroethylene reactor, transfer it to a hydrothermal kettle, and 150 ℃ hydrothermal reaction in an oven for 24h. Then cool to room temperature, take out the liner, pour off the supernatant to obtain a white precipitate, wash with water and centrifuge until the pH of the supernatant is about 7. After washing once with alcohol, the precipitate was dispersed in a petri dish, dried at 80°C for 5 hours, and the powder was collected. Take 1g of the above powder, add 300mL HCl (0.1mol / L), stir magnetically for 1.5h, then wash with water and centrifuge until the supernatant pH is 7, then wash with alcohol and disperse in a petri dish, dry at 80°C for 5h, collect the powder, and obtain the hydrogen radical Titanate Nanotubes (H-TNT).

[0028] Take 0.2-0.5g of H-TNT, dissolve it in abso...

Embodiment 2

[0033] According to the conditions of Example 1, only changing the heating rate to 1° C. / min, anatase nanotubes wrapped with amorphous carbon were obtained. After the battery is assembled according to the method of Example 1, the discharge specific capacity remains 152mAhg after 100 cycles at a current density of 0.5C -1 .

[0034] image 3 For the prepared CTiO 2 Nanotube rate performance diagram, showing excellent rate performance, when the current density reaches 20C, the capacity remains at 126mAhg -1 , when the current density drops back to 0.5C, the current density rises back to 162mAhg -1 , close to the initial value.

Embodiment 3

[0036] According to the conditions of Example 2, only changing the holding temperature to 400 ° C, obtained TiO coated with amorphous carbon 2 Nanotubes, whose crystal form is TiO 2 -B type, after being assembled into a battery according to the method of Example 1, the discharge specific capacity remains at 154mAhg after 100 cycles at a current density of 10C -1, the Coulombic efficiency is close to 100%, as Figure 4 It is shown that the material has excellent electrochemical performance.

[0037] Figure 5 For the prepared CTiO 2 Nanotube rate performance diagram, showing excellent rate performance, when the current density reaches 20C, the capacity remains at 157mAhg -1 , when the current density drops back to 0.5C, the current density rises back to 219mAhg -1 , close to the initial value.

[0038] In summary, a kind of lithium ion battery negative electrode material CTiO of the present invention 2 A method for preparing nanotubes. By synthesizing carbon-coated nanot...

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Abstract

The invention discloses a preparation method for a carbon-coated super-long titanium dioxide nanotube negative electrode material of a lithium ion battery. The preparation method comprises the following steps of preparing a titanic acid nanotube by a hydrothermal method, and acidizing the titanic acid nanotube to obtain a hydrogen-based tube; dissolving the obtained hydrogen-based tube in ethanol, adding an organic macromolecular ethanol solution, and then carrying out low-temperature stirring to obtain macromolecular-coated hydrogen-based tube serving as a carbon-coated titanium dioxide nanotube precursor; and carrying out high-temperature thermal treatment on the precursor under the production of an inert gas to obtain the carbon uniformly-coated super-long titanium dioxide nanotube negative electrode material of the lithium ion battery. The preparation method has the advantages of simplicity in process, easiness in operation, material availability, low cost and environmental friendliness, no special device is needed in the whole reaction process, industrial production is promoted, and the quality of the finally-obtained product is relatively high; and with a high-conductive phase substance composite nano tubular structure prepared according to the method, the ion transmission distance can be shortened, the conductivity of the material and the ion diffusion rate of the material are improved, so that the material has excellent rate capability, stable cycle performance and high coulombic efficiency. The material prepared according to the method is an ideal lithium ion negative electrode material having wide commercial application prospect.

Description

technical field [0001] The invention belongs to the field of preparation and application of new energy materials, specifically a kind of amorphous carbon-coated TiO with good crystallinity based on macromolecular coating synthesis, excellent rate performance, high Coulombic efficiency and stable cycle performance. 2 nanotube method. Background technique [0002] Titanium dioxide, as a "zero strain" material, hardly changes its structure during charging and discharging. It has the advantages of high safety, stable cycle performance, abundant resources, low price, and environmental friendliness, making it a promising development prospect for lithium-ion batteries. negative electrode material. However, titanium dioxide has low conductivity (~10 -13 Scm -1 ), resulting in poor rate performance, especially in the fields of electric vehicles and large energy storage batteries, which are greatly limited. Therefore, improving the conductivity of titanium dioxide electrode materi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/60H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/48H01M4/483H01M4/602H01M10/0525Y02E60/10
Inventor 曹立新丁蕾董博华苏革高荣杰
Owner OCEAN UNIV OF CHINA
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