Titanium dioxide coated CoSe2-based nano material as well as preparation method and application thereof

A titanium dioxide and nanomaterial technology, applied in the field of sodium ion materials, can solve the problems of charge-discharge specific capacity decay, slow reaction kinetics, unstable volume effect, etc., and achieve the effects of low contact resistance, low pollution, and promotion of interface electron transport.

Pending Publication Date: 2022-07-29
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its practical application is limited by the disadvantages of poor conductivity, slow reaction kinetics, obvious volume effect and unstable electrode-electrolyte interface. Even at low rates, the charge-discharge specific capacity may still decay rapidly, so that the battery fail

Method used

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  • Titanium dioxide coated CoSe2-based nano material as well as preparation method and application thereof
  • Titanium dioxide coated CoSe2-based nano material as well as preparation method and application thereof
  • Titanium dioxide coated CoSe2-based nano material as well as preparation method and application thereof

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preparation example Construction

[0029] The present invention is based on the preparation of titania-coated CoSe with a Prussian blue analog template 2 The preparation method of the base nanomaterial further comprises the following steps:

[0030] (a) Weigh cobalt acetate, potassium hexacyanocarboxylate, and sodium dodecyl sulfate into a certain amount of deionized water, disperse uniformly by ultrasonic, and then stand at 25°C for 24 hours after vigorous magnetic stirring for about 1 hour. The precipitate was collected by centrifugation using absolute ethanol as the solvent, and dried at 60°C for 12 hours.

[0031] (b) The Co-Co PBA microcubes synthesized in step (a) were uniformly ultrasonically dispersed in a mixed solution of absolute ethanol and concentrated ammonia solution (28 wt%), followed by a pipette at 1 mL min. -1 The organic solution of titanium ester was added dropwise to the mixed solution at the rate of . After heating in an oil bath for 5 hours, it was allowed to stand at room temperature ...

Embodiment 1

[0035] This embodiment provides a TNC-CoSe 2 The preparation method of -100 composite electrode material, which comprises the following steps:

[0036] (a) Add 0.2 g of cobalt acetate, 0.265 g of potassium hexacyanocarboxylate and 5.4 g of sodium dodecyl sulfate to 400 mL of deionized water, and ultrasonically disperse them evenly. . The precipitate was collected by centrifugation using absolute ethanol as the solvent, and dried at 60°C for 12 hours.

[0037] (b) 0.2 g of Co-Co PBA synthesized in step (a) was uniformly ultrasonically dispersed in a mixed solution of 60 mL of anhydrous ethanol and 0.15 mL of concentrated ammonia solution (28 wt%), and after ultrasonically dispersed for 30 minutes, the solution was dispersed at 1 mL min. -1 100 μL of tetrabutyl titanate (TBOT) was added dropwise to the mixed solution at a rate of . After heating in an oil bath at 80°C for 5h, it was left to stand at 25°C for 24h. Centrifuge four times using absolute ethanol as solvent, and d...

Embodiment 2

[0041] This embodiment provides a TNC-CoSe 2 The preparation method of -200 composite electrode material, which comprises the following steps:

[0042] (a) Add 0.2 g of cobalt acetate, 0.265 g of potassium hexacyanocarboxylate and 5.4 g of sodium dodecyl sulfate to 400 mL of deionized water, and ultrasonically disperse them evenly. . The precipitate was collected by centrifugation using absolute ethanol as the solvent, and dried at 60°C for 12 hours.

[0043] (b) 0.2 g of Co-Co PBA synthesized in step (a) was uniformly ultrasonically dispersed in a mixed solution of 60 mL of anhydrous ethanol and 0.15 mL of concentrated ammonia solution (28 wt%), and after ultrasonically dispersed for 30 minutes, the solution was dispersed at 1 mL min. -1 200 μL of tetrabutyl titanate (TBOT) was added dropwise to the mixed solution at a rate of . After heating in an oil bath at 80°C for 5h, it was left to stand at 25°C for 24h. Centrifuge four times using absolute ethanol as solvent, and d...

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Abstract

The invention provides a titanium dioxide coated CoSe2-based nano material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a Co-Co PBA microcube with a nanometer size; the Co-Co PBA microcubes are ultrasonically dispersed in a mixed solution of absolute ethyl alcohol and a concentrated ammonia solution, an organic solution of titanium ester is dropwise added into the mixed solution at the speed of 0.5 mLmin <-1 > to 1 mLmin <-1 >, oil bath heating is conducted for 5 h to 8 h at the temperature of 70 DEG C to 100 DEG C, standing is conducted for 20 h to 24 h at the room temperature, after the reaction is finished, a solvent is used for cleaning a product, centrifugal collection is conducted, and Co-Co PBA-at-TiO2 is obtained; the preparation method comprises the following steps: uniformly grinding Co-Co PBA-coated TiO2 and selenium powder, and carrying out high-temperature selenylation and carbonization under the protection of inert gas, so as to obtain the titanium dioxide-coated CoSe2-based nano material TNC-CoSe2. The nano material disclosed by the invention is used as a negative electrode material of a sodium-ion battery, and has ultrahigh rate and cycling stability at the same time.

Description

technical field [0001] The invention relates to a preparation method of nanomaterials, in particular to a titanium dioxide-coated CoSe 2 The invention relates to a preparation method of a nano-based material, belonging to the technical field of sodium ion materials. Background technique [0002] Sodium-ion batteries (SIBs) have similar structural features and electrochemical principles to lithium-ion batteries (LIBs), and have attracted extensive attention of researchers due to the abundant and low cost of sodium raw materials. However, the large radius and slow diffusion kinetics of Na+ limit the practical application of Na-ion batteries. Lithium-ion batteries are dominated by graphite anodes. These materials have good lithium intercalation characteristics, but for sodium-ion batteries, their sodium intercalation efficiency is low, and the specific capacity is only 31mAh g -1 . Therefore, scientists are working to develop anode materials with high specific capacity for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M10/054
CPCH01M4/366H01M4/485H01M4/58H01M10/054
Inventor 任玉荣赵宏顺戚燕俐
Owner CHANGZHOU UNIV
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