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Molybdenum disulfide nanosheet coated titanium-based MOF derived titanium dioxide composite material as well as preparation method and application thereof

A technology of titanium dioxide and molybdenum disulfide, applied in the direction of titanium dioxide, molybdenum sulfide, titanium oxide/hydroxide, etc., can solve the problems of poor conductivity, poor interface bonding stability, limited electrochemical performance and cycle stability, etc., to promote the charge Effects of transfer, enhanced conductivity, enhanced rate capability and cycle stability

Active Publication Date: 2021-06-25
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Through the above analysis, the defects of the existing technology are as follows: firstly, MoS 2 The poor electrical conductivity of the material and the large change in the material structure during charge and discharge limit the electrochemical performance and cycle stability; secondly, the existing TiO 2 @MoS 2 Composite materials are mostly 1D and 2D hybrid materials, and the interface bonding stability is poor, which limits the rate performance and cycle life of electrode materials

Method used

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  • Molybdenum disulfide nanosheet coated titanium-based MOF derived titanium dioxide composite material as well as preparation method and application thereof
  • Molybdenum disulfide nanosheet coated titanium-based MOF derived titanium dioxide composite material as well as preparation method and application thereof
  • Molybdenum disulfide nanosheet coated titanium-based MOF derived titanium dioxide composite material as well as preparation method and application thereof

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preparation example Construction

[0030] see figure 1 As shown, the preparation method of a molybdenum disulfide nanosheet coated titanium-based MOF derived titanium dioxide composite material provided by the present invention comprises the following steps:

[0031] S101: Using tetraisopropyl titanate and terephthalic acid as raw materials, a titanium-based MOF material is synthesized by a hydrothermal method. It was calcined under the protection of nitrogen to form TiO with black three-dimensional structure 2 powder;

[0032] S102: Dissolve glucose in deionized water, add black TiO 2 powder, after stirring for 30 minutes, transfer the mixture to the reaction kettle for heating, and then centrifuge and wash to obtain carbon-coated TiO with black precipitate 2 Composite (TiO 2 @C);

[0033] S103: ultrasonically dissolve SodiumMolybdatDihydrat (sodium molybdate) and Thiourea (thiourea) in deionized water, add black TiO 2 @C powder, after stirring for 30 minutes, transfer the mixture into the reaction kettl...

Embodiment 1

[0037] A kind of molybdenum disulfide nanosheet coated titanium-based MOF derived titanium dioxide composite material, see figure 1 shown, including the following steps:

[0038]Weigh 6ml of anhydrous methanol, 54ml of N-N dimethylformamide mixed solution as a solvent, add 6g of terephthalic acid, 1.56ml of tetraisopropyl titanate, ultrasonically stir the above reaction solution for 12h, transfer to the reaction kettle, That is, solvothermal reaction, high temperature 150 ℃ for 20-21h, preparation of titanium-based MOF precursor;

[0039] Under a nitrogen protective atmosphere, the obtained titanium-based MOF material was calcined at a high temperature of 300°C to obtain a black three-dimensional structure of TiO 2 powder;

[0040] Prepare 40ml of 1M glucose solution, add 40mg of TiO with three-dimensional structure 2 The powder was stirred and ultrasonically transferred into the reaction kettle, and kept at a high temperature of 100°C for 5 hours; to obtain carbon-coated T...

Embodiment 2

[0043] A kind of molybdenum disulfide nanosheet coated titanium-based MOF derived titanium dioxide composite material, see figure 1 shown, including the following steps:

[0044] Weigh 6ml of anhydrous methanol, 54ml of N-N dimethylformamide mixed solution as solvent, add 6g of terephthalic acid, 1.56ml of tetraisopropyl titanate, and prepare titanium-based MOF by solvothermal reaction;

[0045] Under a nitrogen protective atmosphere, the obtained titanium-based MOF material was calcined at a high temperature of 700 ° C to obtain a black three-dimensional structure of TiO 2 powder;

[0046] Prepare 40ml of 1M glucose solution, add 40mg of TiO with three-dimensional structure 2 The powder was stirred and ultrasonically transferred into the reaction kettle, and kept at a high temperature of 120°C for 7 hours; to obtain carbon-coated TiO 2 Composite (TiO 2 @C);

[0047] Take 40ml deionized water, add 300mg Sodium Molybdat Dihydrat (sodium molybdate) and 600mg Thiourea (thiou...

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Abstract

The invention discloses a preparation method of a molybdenum disulfide nanosheet coated titanium-based MOF derived titanium dioxide composite material, and relates to the technical field of battery materials. The method comprises the following steps: providing a titanium-based MOF material, and calcining the titanium-based MOF material under the protection of inert gas or nitrogen to obtain titanium-based MOF-derived titanium dioxide; taking titanium-based MOF-derived titanium dioxide and a carbon source as raw materials and water as a solvent, carrying out hydrothermal reaction to obtain a carbon-coated titanium dioxide compound; and uniformly dispersing a molybdenum source and a sulfur source in a water solvent, adding the carbon-coated titanium dioxide compound, uniformly mixing, and keeping the temperature at 200-230 DEG C for 20-24 hours to obtain the composite material. According to the preparation method, the TiO2 material prepared by taking the titanium-based MOF as the precursor is coated with the layered MoS2 nanosheet, the two materials are tightly combined, and meanwhile, the surface of the TiO2 material is coated with the uniform carbon layer, so that the conductivity of the material is improved, and a large number of sites are provided for uniform coating of MoS2.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a titanium-based MOF-derived titanium dioxide composite material coated with molybdenum disulfide nanosheets, a preparation method and an application. Background technique [0002] As the main energy source for portable electronic devices, lithium-ion batteries have attracted much attention due to their potential applications in electronic devices. Therefore, researchers have invested a lot of energy in the development of electrode materials with high energy density, power density, long cycle life and short charge and discharge time. Among them, molybdenum disulfide (MoS 2 ) nanosheets, as the main two-dimensional (2D) transition metal sulfides, have become promising electrode materials due to their advantages of low cost, high capacity and simple synthesis method. And MoS 2 It has a layered structure, which allows fast intercalation and extraction of electronic ions...

Claims

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Application Information

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IPC IPC(8): C01G39/06C01G23/047C01B32/05H01M4/36H01M4/48H01M4/58H01M4/62H01M10/0525
CPCC01G39/06C01G23/047C01G23/08C01B32/05H01M4/366H01M4/483H01M4/5815H01M4/625H01M10/0525C01P2002/72C01P2004/03C01P2004/61Y02E60/10
Inventor 林健健周倩男高孟友郑德华
Owner QINGDAO UNIV OF SCI & TECH