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Titanium carbide/carbon core-shell nanowire array loaded nitrogen-doped lithium titanate composite material and its preparation method and application

A nanowire array and composite material technology is applied in the field of titanium carbide/carbon core-shell nanowire array-supported nitrogen-doped lithium titanate composite material and its preparation, which can solve the problems of limited application, low electronic conductivity and the like, and achieve improved The effect of lithium titanate oxygen vacancy concentration, high electrical conductivity and good mechanical properties

Active Publication Date: 2021-02-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low electronic conductivity and ion mobility limit its application at high current

Method used

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  • Titanium carbide/carbon core-shell nanowire array loaded nitrogen-doped lithium titanate composite material and its preparation method and application
  • Titanium carbide/carbon core-shell nanowire array loaded nitrogen-doped lithium titanate composite material and its preparation method and application
  • Titanium carbide/carbon core-shell nanowire array loaded nitrogen-doped lithium titanate composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Using atomic layer deposition (ALD) technology to grow a layer of Al on titanium mesh 2 o 3 , Al source and O source are respectively Al(CH 3 ) and H 2 O, the reaction temperature is 200 °C, and the supported Al 2 o 3 titanium mesh.

[0040] (2) Utilize chemical vapor deposition (CVD) technology in step (1) gained loading Al 2 o 3 TiC / C core-shell nanowire arrays grown on Ti mesh. will load Al 2 o 3 The titanium mesh is placed in a tube furnace, and a mixed gas of argon and hydrogen carrying acetone vapor is introduced. The flow rate of argon is 100 sccm, and the flow rate of hydrogen carrying acetone vapor is 10 sccm. React at 800 ° C for 1 hour to form TiC / C nanowire core-shell array to obtain titanium carbide / carbon core-shell nanowire array composite electrode material.

[0041] (3) Dissolve 0.9g of lithium hydroxide, 2mL of hydrogen peroxide and 1.2g of isopropyl titanate in 50mL of water to form solution A;

[0042] (4) The titanium carbide / carbon ...

Embodiment 2

[0049] (1) Using atomic layer deposition (ALD) technology to grow a layer of Al on titanium mesh 2 o 3 . Al source and O source are respectively Al(CH 3 ) and H 2 O, the reaction temperature is 250°C.

[0050] (2) Utilize chemical vapor deposition (CVD) technology in step (1) gained loading Al 2 o 3 TiC / C core-shell nanowire core-shell arrays grown on Ti mesh. will load Al 2 o 3 The titanium mesh is placed in a tube furnace, and a mixed gas of argon and hydrogen carrying acetone vapor is introduced. The flow rate of argon is 130 sccm, and the flow rate of hydrogen carrying acetone vapor is 15 sccm. React at 850 ° C for 2 hours to obtain TiC / C core-shell nanowire core-shell array.

[0051] (3) Dissolve 1g of lithium hydroxide, 3mL of hydrogen peroxide and 1.3g of isopropyl titanate in 60mL of water to form solution A;

[0052] (4) The titanium carbide / carbon core-shell nanowire array composite electrode material obtained in step (2) was placed in solution A, subjecte...

Embodiment 3

[0057] (1) Using atomic layer deposition (ALD) technology to grow a layer of Al on titanium mesh 2 o 3 . Al source and O source are respectively Al(CH 3 ) and H 2 O, the reaction temperature is 300°C.

[0058] (2) Utilize chemical vapor deposition (CVD) technology in step (1) gained loading Al 2 o 3 Titanium carbide / carbon nanowire core-shell arrays grown on titanium mesh. will load Al 2 o 3 The titanium net is placed in a tube furnace, and a mixed gas of argon and hydrogen carrying acetone vapor is introduced. The flow rate of argon is 150 sccm, and the flow rate of hydrogen carrying acetone vapor is 20 sccm. React at 900 ° C for 3 hours to obtain TiC / C nanowire core-shell arrays.

[0059] (3) Dissolve 1.1g of lithium hydroxide, 4mL of hydrogen peroxide and 1.4g of isopropyl titanate in 70mL of water to form solution A;

[0060] (4) The titanium carbide / carbon core-shell nanowire array composite electrode material obtained in step (2) was placed in solution A, subj...

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Abstract

The invention discloses a titanium carbide / carbon core-shell nanowire array load nitrogen-doped lithium titanate composite material, a preparation method and application thereof. The method comprisesthe following steps: using an atomic layer deposition technology to grow aluminum oxide on a titanium mesh; using a chemical vapor deposition technology to grow a titanium carbide / carbon core-shell nanowire core-shell array (TiC / C) on the titanium mesh; then putting the titanium carbide / carbon core-shell nanowire array composite material in a solution to carry out a hydrothermal reaction, and thencarrying out washing, drying and calcinations to obtain LTO@TiC / C; and finally using an ammonia gas nitrating technology to nitrate the LTO@TiC / C composite array to obtain N-LTO@TiC / C. The constructed composite material, as a negative electrode material for lithium ion batteries, has excellent high rate capability and super long cycle life.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium-ion batteries, in particular to a titanium carbide / carbon core-shell nanowire array-supported nitrogen-doped lithium titanate composite material and its preparation method and application. Background technique [0002] Since entering the 21st century, energy and environmental problems have become increasingly severe, and the development of green energy has also received increasing attention. In order to achieve high energy conversion efficiency and energy density, the development of high-performance electrochemical energy storage technology has become the focus of current research. Lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect. They have been widely used in portable electronic devices (such as mobile phones, digital cameras, video cameras, notebook computers, etc.) Expansion in fields such as electric vehic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/485H01M4/624H01M10/0525Y02E60/10
Inventor 夏新辉姚珠君王秀丽涂江平
Owner ZHEJIANG UNIV
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