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Vertical graphene/niobium-titanium-oxygen/sulfur-carbon composite material with three-dimensional porous array structure and preparation method and application of vertical graphene/niobium-titanium-oxygen/sulfur-carbon composite material

A sulfur-carbon composite material, three-dimensional porous technology, applied in nanotechnology, structural parts, electrical components, etc. for materials and surface science, can solve the problem of lack of fast electron transmission channels, etc., and achieve superior cycle stability and high magnification Performance, the effect of increasing the contact area

Active Publication Date: 2018-10-12
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in the array structure, the electrode material TiNb 2 o 7 Will be in direct contact with the electrolyte, lacking a fast electron transport channel

Method used

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  • Vertical graphene/niobium-titanium-oxygen/sulfur-carbon composite material with three-dimensional porous array structure and preparation method and application of vertical graphene/niobium-titanium-oxygen/sulfur-carbon composite material
  • Vertical graphene/niobium-titanium-oxygen/sulfur-carbon composite material with three-dimensional porous array structure and preparation method and application of vertical graphene/niobium-titanium-oxygen/sulfur-carbon composite material
  • Vertical graphene/niobium-titanium-oxygen/sulfur-carbon composite material with three-dimensional porous array structure and preparation method and application of vertical graphene/niobium-titanium-oxygen/sulfur-carbon composite material

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preparation example Construction

[0037] (1) Preparation method of vertical graphene (VG): By plasma enhanced chemical vapor deposition (PECVD), VG arrays are deposited on carbon cloth in an orderly manner (microwave frequency is 2.45 GHz and microwave power is 2 kW). Firstly, arrange the carbon in the cavity and make the gas pressure reach 10mTorr; secondly, after raising the temperature of the cavity to 400°C, hydrogen plasma is generated in the cavity. 2 Produced in the air stream, while introducing methane. During the whole reaction process, the ratio of hydrogen to methane was 3:2, and the reaction time was kept at 2 h. Finally, it was cooled to room temperature 25 °C, and the VG sample preparation was completed.

[0038] (2) VG / TiNb 2 o 7 The preparation method: the VG substrate was dried in an oven for 12 hours and weighed. After weighing, the vertical graphene (VG) was used as the growth substrate, and the isopropyl titanate (C 12 h 28 o 4 Ti) and niobium pentachloride (NbCl 5 ) as a precursor fo...

Embodiment 1

[0041] The VG substrate was dried in a vacuum oven. Using isopropyl titanate (C 12 h 28 o 4 Ti) and niobium pentachloride (NbCl 5 ) was used as a precursor for solvothermal reaction at 200°C for 6h, and then cooled with the furnace. The obtained sample was washed several times with deionized water and absolute ethanol, dried, and calcined at 700 °C for 2 h under an argon protective atmosphere with a heating rate of 5 °C / min to obtain VG / TiNb 2 o 7 Film samples. Take VG / TiNb 2 o 7 For the core, the EDOT and LiClO 4 A galvanostatic anodic deposition was carried out in acetonitrile solution. After about 10s, the PEDOT polymer will be uniformly deposited on the VG / TiNb 2 o 7 array, forming a core-shell structure, and then calcined in a tube furnace at 700 °C for 2 h (Ar atmosphere) to obtain VG / TiNb 2 o 7 @S-C Three-dimensional porous array.

Embodiment 2

[0043] The VG substrate was dried in a vacuum oven. Using isopropyl titanate (C 12 h 28 o 4 Ti) and niobium pentachloride (NbCl 5 ) was used as a precursor for solvothermal reaction at 200°C for 6h, and then cooled with the furnace. The obtained sample was washed several times with deionized water and absolute ethanol, dried, and calcined at 700 °C for 2 h under an argon protective atmosphere with a heating rate of 5 °C / min to obtain VG / TiNb 2 o 7 Film samples. Take VG / TiNb 2 o 7 For the core, the EDOT and LiClO 4 A galvanostatic anodic deposition was carried out in acetonitrile solution. After about 20s,

[0044] PEDOT polymer will be deposited uniformly on VG / TiNb 2 o 7 array, forming a core-shell structure, and then calcined in a tube furnace at 700 °C for 2 h (Ar atmosphere) to obtain VG / TiNb 2 o 7 @S-C Three-dimensional porous array.

[0045] The VG / TiNb that makes in embodiment 2 2 o 7 The scanning electron microscope image of the array is shown in figu...

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Abstract

The invention discloses a vertical graphene / niobium-titanium-oxygen / sulfur-carbon composite material with a three-dimensional porous array structure and a preparation method and application of vertical graphene / niobium-titanium-oxygen / sulfur-carbon composite material. The method comprises the steps of vertically growing a graphene nanosheet on a substrate in an intertwining manner; forming a VG / TiNb2O7 nanosheet by TiNb2O7 coating the graphene nanosheet; and forming a VG / TiNb2O7@S-C three-dimensional porous array by a sulfur-doped carbon layer coating the VG / TiNb2O7 nanosheet. According to thepreparation method, a VG / TiNb2O7 nanoarray is reversely synthesized; and the composite material is prepared by using the VG / TiNb2O7 nanoarray as a carrier through constant-current anodic deposition.The composite material disclosed by the invention has the characteristics of high cycling stability, high rate capability, coulombic efficiency and the like and is capable of significantly improving the energy density / power density and the cycling stability of a total battery when matched with lithium iron phosphate or a ternary material. The novel composite material disclosed by the invention issuitable for being used as a negative electrode material for a lithium-ion battery and can be applied to various electronic devices, electric vehicles and hybrid vehicles.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium-ion secondary batteries, in particular to a vertical graphene / titanium-niobium-oxygen / sulfur-carbon composite material with a three-dimensional porous array structure, a preparation method thereof, and an application as a lithium-ion battery negative electrode material. Background technique [0002] Lithium-ion batteries are currently the most important electrical energy storage devices and are widely used in transportation, information electronics and other fields. The rapid development of lithium-ion batteries mainly depends on the innovation of positive and negative electrode materials. However, the most widely used negative electrode active graphite material is easy to form dendrites, and silicon and tin-based compounds have serious volume expansion problems. Moreover, SEI film (solid electrolyte interface film, solid electrolyte interface) is easy to form, and...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/48H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/583H01M10/0525Y02E60/10
Inventor 夏新辉沈盛慧邓盛珏涂江平王秀丽
Owner ZHEJIANG UNIV
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