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Tin-carbon co-doped titanium niobate material as well as preparation method and application thereof

A technology of co-doping and titanium niobate, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve the problems of high energy consumption and complicated preparation process, and achieve simple preparation method, excellent specific capacity and long cycle The effect of electrochemical performance

Active Publication Date: 2020-11-03
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the industry, carbon coating technology usually prepares titanium niobate materials first, then mixes titanium niobate materials with carbon sources such as sugar, starch, polymers, etc., and dries them to obtain precursors, which are then calcined and carbonized at high temperature. The preparation process complex and energy-intensive
There is no report on the preparation of tin-carbon co-doped titanium niobate

Method used

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  • Tin-carbon co-doped titanium niobate material as well as preparation method and application thereof
  • Tin-carbon co-doped titanium niobate material as well as preparation method and application thereof
  • Tin-carbon co-doped titanium niobate material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A tin-carbon co-doped titanium niobate material, the molar fraction of tin in the tin-carbon co-doped titanium niobate material is 8%, and the mass of carbon in the tin-carbon co-doped titanium niobate material is The score is 1.53%.

[0028] The preparation method of the above-mentioned tin-carbon co-doped titanium niobate material comprises the following steps:

[0029] (1) Weigh 2.65g of niobium pentoxide (Nb 2 o 5 ), 587mg of titanium dioxide (TiO 2 ), 256 mg of dodecyl stannoic acid (C 12 h 25 SnOOH) was added into 10.0mL of absolute ethanol to obtain a mixed solution, then the mixed solution was placed in a zirconia ball mill jar, and ball milled on a star ball mill, the rotating speed of the ball mill was set to 300rpm, and the ball milling time was 8 hours, and the ball milling was completed Finally, the mixed solution was transferred to a blast drying oven, dried at 80°C for 3 hours, and the solid collected after drying was the precursor;

[0030] (2) Put...

Embodiment 2

[0032] A tin-carbon co-doped titanium niobate material, the molar fraction of tin in the tin-carbon co-doped titanium niobate material is 6%, and the mass of carbon in the tin-carbon co-doped titanium niobate material is The score is 1.02%.

[0033] The preparation method of the above-mentioned tin-carbon co-doped titanium niobate material comprises the following steps:

[0034] (1) Weigh 2.65g of niobium pentoxide (Nb 2 o 5 ), 600mg of titanium dioxide (TiO 2 ), 192mg of dodecyl stannoic acid (C 12 h 25 SnOOH) was added into 10.0mL of absolute ethanol to obtain a mixed solution, then the mixed solution was placed in a zirconia ball mill jar, and ball milled on a star ball mill, the rotating speed of the ball mill was set to 300rpm, and the ball milling time was 8 hours, and the ball milling was completed Finally, the mixed solution was transferred to a blast drying oven, dried at 80°C for 3 hours, and the solid collected after drying was the precursor;

[0035] (2) Put ...

Embodiment 3

[0041] A tin-carbon co-doped titanium niobate material, the molar fraction of tin in the tin-carbon co-doped titanium niobate material is 8%, and the mass of carbon in the tin-carbon co-doped titanium niobate material is The score is 2.55%.

[0042] The preparation method of the above-mentioned tin-carbon co-doped titanium niobate material comprises the following steps:

[0043] (1) Weigh 2.65g of niobium pentoxide (Nb 2 o 5 ), 587mg of titanium dioxide (TiO 2 ), 504mg of dibutyltin dilaurate (Bu 2 Sn(OOCC 11 h 23 ) 2 ) was added to 10.0mL of absolute ethanol to obtain a mixed solution, then the mixed solution was placed in a zirconia ball mill jar, and ball milled on a star ball mill, the rotating speed of the ball mill was set to 300rpm, and the ball milling time was 8 hours. Transfer the mixed solution to a blast drying oven, dry at 80°C for 3 hours, and collect the solid as the precursor after drying;

[0044] (2) Put the precursor obtained in the above steps into ...

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Abstract

The invention discloses a tin-carbon co-doped titanium niobate material as well as a preparation method and application thereof. In the tin-carbon co-doped titanium niobate material, the molar fraction of tin is 0.5%-10%, and the mass fraction of carbon is 0.4%-5%. The preparation method comprises the following steps: (1) adding a niobium source, a titanium source and an organic tin source into adispersing agent, and ball-milling and drying the mixture to obtain a precursor; and (2) calcining the precursor in an inert atmosphere, and then cooling to obtain the tin-carbon co-doped titanium niobate material. According to the application, the tin-carbon co-doped titanium niobate material is used as the negative electrode material of the lithium ion battery. According to the preparation method, organic tin is used as a carbon source and a tin source at the same time, carbon coating and tin doping of the titanium niobate material can be achieved in one step, so that step-by-step operationis not needed, and the preparation method is simple; besides, the tin-carbon co-doped titanium niobate material prepared by the invention is used as a negative electrode material of a lithium ion battery, can show excellent specific capacity, long cycle and other electrochemical properties, and is an ideal negative electrode material of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a tin-carbon co-doped titanium niobate material and its preparation method and application. Background technique [0002] Titanium niobate (commonly such as TiNb 2 o 7 、Ti 2 Nb 10 o 29 ) is an ideal lithium-ion battery anode material with a deintercalation mechanism and a high theoretical specific capacity, TiNb 2 o 7 and Ti 2 Nb 10 o 29 The theoretical capacity is as high as 388 and 396mAh g -1 . It can maintain stability during the charge and discharge process, and the volume change is almost zero; in addition, the titanium niobate material will not produce dendrites during the charge and discharge process, so it has the advantages of high safety and good cycle performance. Although titanium niobate is widely considered as a negative electrode material with good application prospects, its own disadvantages such as poor electrical conductivity and slow dif...

Claims

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Application Information

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IPC IPC(8): C01G33/00H01M4/58H01M10/0525
CPCC01G33/006H01M4/5825H01M10/0525C01P2004/80C01P2006/40Y02E60/10
Inventor 毛武涛李茂龙丁一鸣马超贺畅曹志翔鲍克燕
Owner JIANGSU UNIV OF TECH
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