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In-situ carbon-coated titanium niobate composite material, and preparation method and application thereof

A composite material, carbon coating technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of shortening the migration distance of carriers inside the primary particle

Active Publication Date: 2021-04-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for preparing an in-situ carbon-coated titanium niobate composite material, which can effectively promote lithium The diffusion of ions in the porous electrode solves the problem of excessive carbon coating, and the confinement effect of the carbon source can effectively suppress the Ti during the phase formation process. x Nb y o z The excessive growth of primary particles can effectively shorten the migration distance of carriers inside the primary particles, which can effectively improve the electronic conductivity of the material

Method used

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  • In-situ carbon-coated titanium niobate composite material, and preparation method and application thereof
  • In-situ carbon-coated titanium niobate composite material, and preparation method and application thereof
  • In-situ carbon-coated titanium niobate composite material, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0035] An in-situ carbon-coated titanium niobate composite material is prepared by the following method:

[0036] (1) Weigh 2.11g Nb(OC 2 h 5 ) 5 Dissolve in 40mL absolute ethanol, stir well, then weigh 1.13g Ti(OC 4 h 9 ) 4 Add to the above solution and stir vigorously for 1 hour to obtain a mixed solution;

[0037] (2) Then add 0.1 g of ascorbic acid and stir rapidly for 2 hours, and vacuum-dry the obtained suspension at 150° C. for 12 hours to obtain a powder mixture;

[0038] (3) Place the obtained powder mixture in a tube furnace, feed nitrogen gas, raise the temperature at 5°C / min to 500°C and keep it warm for 10 hours, then naturally cool down to normal temperature to obtain the first product;

[0039] (4) Place the primary product in a muffle furnace, raise the temperature at 5°C / min to 350°C for 1 hour in an air atmosphere, and then cool down naturally to room temperature to obtain the target product TiNb 2 o7 @C.

Embodiment 2

[0041] An in-situ carbon-coated titanium niobate composite material is prepared by the following method:

[0042] (1) Weigh 5.4g NbCl 5 Dissolve in 80mL absolute ethanol, stir well, then weigh 2.84g Ti(OC 3 h 7 ) 4 Add to the above solution and stir vigorously for 2 hours to obtain a mixed solution;

[0043] (2) Add 0.4 g of sucrose and stir rapidly for 3 hours, and freeze-dry the obtained suspension for 24 hours to obtain a powder mixture;

[0044] (3) Put the powder mixture in a tube furnace, feed nitrogen gas, raise the temperature at 5°C / min to 800°C and keep it warm for 5 hours, then cool down to normal temperature naturally to obtain the first product;

[0045] (4) Put the primary product in a muffle furnace, under a pure oxygen atmosphere, heat up to 400°C at 3°C / min and keep it for 0.5 hours, then cool down naturally to room temperature to obtain the target product TiNb 2 o 7 @C.

Embodiment 3

[0047] An in-situ carbon-coated titanium niobate composite material is prepared by the following method:

[0048] (1) Weigh 7.986g TiO 2 Disperse in 1000mL water, stir well, then weigh 318.972g Nb 2 o 5 Add to the above mixture and stir vigorously for 1 hour to obtain the target mixture;

[0049] (2) Add 31.897g of glucose and stir rapidly for 2 hours, and the obtained suspension is spray-dried to obtain a powder mixture;

[0050] (3) Place the obtained powder mixture in a tube furnace, feed nitrogen gas, raise the temperature at 10°C / min to 1300°C and keep it warm for 10 hours, then cool down to normal temperature naturally to obtain the first product;

[0051] (4) Place the primary product in a muffle furnace, raise the temperature at 20°C / min to 500°C for 0.2 hours in an air atmosphere, and cool down naturally to room temperature to obtain the target product TiNb 24 o 62 @C.

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Abstract

The invention belongs to the field of energy storage devices, and particularly relates to an in-situ carbon-coated titanium niobate composite material, and a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving a niobium source, sequentially adding a titanium source and a carbon source, and uniformly stirring to obtain a mixed solution; (2) drying the mixed solution, and removing the solvent to obtain a powder mixture; (3) carrying out primary heat treatment on the powder mixture to obtain a primary product; and (4) carrying out secondary heat treatment on the primary product in an oxygen-containing atmosphere. The carbon source is added in the first-step mixing process to limit excessive growth of titanium niobate primary particles, first-time heat treatment is carried out in inert gas to enable the uniformly distributed carbon source to be thermally decomposed into carbon, and second-time heat treatment is carried out to enable redundant carbon to be oxidized and removed, so not only is the problem of performance reduction caused by excessive carbon introduced by carbon coating solved, but also excessive growth of titanium niobate is limited, and the performance of the material is comprehensively improved.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and in particular relates to an in-situ carbon-coated titanium niobate composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries (LIBs), as one of the most widely used energy storage systems, have been widely used in consumer electronics in the past two decades, and their application has expanded to electric vehicles (EVs), hybrid electric vehicles (HEVs) in the last decade (HEVs), grid energy storage and other emerging fields. The negative electrode is one of the key components of the battery. At present, most commercial lithium-ion batteries use graphite-like carbon materials as the negative electrode. The migration rate of lithium ions in graphite materials is slow, the working voltage is low, and there are problems such as poor charge-discharge rate performance, fast charging, and poor working safety at low temperatures, whi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/625H01M4/485H01M10/0525Y02E60/10
Inventor 孙永明詹仁明
Owner HUAZHONG UNIV OF SCI & TECH
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