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Graphene array-loaded lithium titanate/carbon nanotube composite array electrode and preparation method and application thereof

A carbon nanotube composite, graphene array technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve problems such as limited application and low electronic conductivity, and achieve multiple active sites, ultra-high rate performance, and electrode performance. stable effect

Active Publication Date: 2017-05-31
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 limits its application under high current charging and discharging

Method used

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  • Graphene array-loaded lithium titanate/carbon nanotube composite array electrode and preparation method and application thereof
  • Graphene array-loaded lithium titanate/carbon nanotube composite array electrode and preparation method and application thereof
  • Graphene array-loaded lithium titanate/carbon nanotube composite array electrode and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Vertical graphene (VG) arrays were grown on carbon cloth by microwave plasma enhanced chemical vapor deposition (MPECVD). The carbon was arranged in a tube furnace, and 30 sccm of methane and 40 sccm of hydrogen were introduced to react at a temperature of 400° C. for 1 hour.

[0040] (2) Using atomic layer deposition (ALD) technology to grow TiO on the vertical graphene obtained in step (1) 2 , Ti source and O source are titanium tetrachloride and water, respectively, and the reaction temperature is 200 °C.

[0041] (3) Dissolve 2.9372g lithium hydroxide in 70mL water to form solution A, the concentration of lithium hydroxide in solution A is 1molL -1 .

[0042] (4) Place the vertical graphene-supported titania composite electrode material obtained in step (2) in solution A, perform a hydrothermal reaction at 80°C for 1 hour, then wash and dry, and finally in an argon protective atmosphere, at 500°C Calcined for 2 hours to obtain a VG / LTO composite array structu...

Embodiment 2

[0049] (1) Vertical graphene arrays were grown on carbon cloth by microwave plasma enhanced chemical vapor deposition (MPECVD). The carbon was arranged in a tube furnace, and 40 sccm of methane and 50 sccm of hydrogen were introduced to react at a temperature of 450° C. for 2 hours.

[0050] (2) Using atomic layer deposition (ALD) technology to grow TiO on the vertical graphene obtained in step (1) 2 , Ti source and O source are titanium tetrachloride and water, respectively, and the reaction temperature is 250 °C.

[0051] (3) Dissolve 5.8744g lithium hydroxide in 70mL water to form solution A, the concentration of lithium hydroxide in solution A is 2molL -1 .

[0052] (4) Place the vertical graphene-loaded titania composite electrode material obtained in step (2) in solution A, perform a hydrothermal reaction at 85°C for 1.5 hours, then wash and dry, and finally in an argon protective atmosphere, at 550°C Calcined for 2.5 hours to obtain a VG / LTO composite array structure...

Embodiment 3

[0057] (1) Vertical graphene arrays were grown on carbon cloth by microwave plasma enhanced chemical vapor deposition (MPECVD). The carbon was placed in a tube furnace, 50 sccm of methane and 60 sccm of hydrogen were introduced, and the reaction was carried out at a temperature of 500° C. for 3 hours.

[0058] (2) Using atomic layer deposition (ALD) technology to grow TiO on the vertical graphene obtained in step (1) 2 , Ti source and O source are titanium tetrachloride and water, respectively, and the reaction temperature is 300 °C.

[0059] (3) Dissolve 8.8116g lithium hydroxide in 70mL water to form solution A, the concentration of lithium hydroxide in solution A is 3molL -1 .

[0060] (4) Place the vertical graphene-supported titania composite electrode material obtained in step (2) in solution A, react with hydrothermal reaction at 90°C for 2 hours, then wash and dry, and finally in an argon protective atmosphere, at 600°C Calcined for 3 hours to obtain a VG / LTO compos...

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Abstract

The invention discloses a graphene array-loaded lithium titanate / carbon nanotube composite array electrode and a preparation method and application thereof. The preparation method comprises the following steps of utilizing a microwave plasma enhanced chemical vapor phase deposition technique to vertically grow a graphene array on a carbon cloth; utilizing an atom layer deposition technique to grow TiO2 (titanium dioxide) on the obtained graphene array; dissolving lithium hydroxide into water to form a solution A; putting the vertical graphene-loaded TiO2 composite electrode material into the solution A, performing hydrothermal reaction, washing, drying and calcining; utilizing a chemical vapor phase deposition technique, using acetylene as a carbon source, and growing a carbon nanotube on the graphene array-loaded lithium titanate composite array electrode under the hydrogen and argon atmospheres, so as to obtain the graphene array-loaded lithium titanate / carbon nanotube composite array electrode. When the graphene array-loaded lithium titanate / carbon nanotube composite array electrode is used as the negative electrode material of lithium ion batteries, the high-rate property and circulating stability are excellent.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrode materials, in particular to a graphene array-supported lithium titanate / carbon nanotube composite array electrode material and a preparation method and application thereof. Background technique [0002] At present, with the continuous development of the economy, the continuous consumption of energy, and the increasingly prominent environmental problems, green energy has become a hot spot that people pay attention to. Because of its convenient storage and no pollution to the environment, electric energy is considered to be one of the ideal energy sources in the 21st century. As a storage device for electrical energy, lithium-ion batteries have the advantages of high energy density, long cycle life, and environmental friendliness, and have been commercialized on a large scale. In recent years, with the development of technology, the research of lithium-ion battery electrode ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/1391H01M4/04H01M10/0525
CPCH01M4/0428H01M4/1391H01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 夏新辉姚珠君涂江平王秀丽
Owner ZHEJIANG UNIV
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