Transition metal chalcogenide nanosheet material and preparation method thereof, battery anode material, secondary battery and application thereof

A transition metal and chalcogenide technology, applied in secondary batteries, metal selenide/telluride, battery electrodes, etc., can solve the problems of dangerous operation, great harm to human body, complicated operation, etc., to alleviate the volume expansion pulverization, The effect of excellent cycle performance and high specific capacity

Inactive Publication Date: 2019-04-19
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method is cumbersome and time-consuming, and requires the use of chemical reagents such as concentrated sulfuric acid, which is dangerous to operate, and carbon nanotubes are expensive, making it difficult to popularize and use
In the patent CN106816602A, a molybdenum diselenide / carbon composite material was prepared, using silicon dioxide nanoparticles as a template, and then etching silicon dioxide with hydrofluoric acid or hot concentrated alkali. This method is complicated to operate, and hydrofluoric acid It is highly corrosive and extremely harmful to the human body
In patent CN108043428A, a two-step hydrothermal method is used to synthesize sulfide, which is complicated to operate and takes a long time

Method used

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  • Transition metal chalcogenide nanosheet material and preparation method thereof, battery anode material, secondary battery and application thereof
  • Transition metal chalcogenide nanosheet material and preparation method thereof, battery anode material, secondary battery and application thereof
  • Transition metal chalcogenide nanosheet material and preparation method thereof, battery anode material, secondary battery and application thereof

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preparation example Construction

[0071] According to a first aspect of the present invention, a method for preparing a transition metal chalcogenide nanosheet material is provided, comprising the following steps:

[0072] Dissolving the raw materials in an aqueous solution of soluble salts, removing water to obtain a solid, then sintering the solid, and washing with water to obtain a transition metal chalcogenide nanosheet material;

[0073] Wherein, the raw materials include chalcogen precursors and transition metal precursors.

[0074] The preparation method adopts soluble salt as template agent, is cheap, environment-friendly, easy to remove in post-treatment, and the obtained transition metal chalcogenide nano-sheet material has thinner sheet thickness. Compared with the traditional silica template method and hydrothermal method, the preparation method greatly shortens the synthesis cycle, has the characteristics of simplicity, controllability, high yield, simple experimental operation, and is suitable fo...

Embodiment 1

[0130] 1. A preparation method of a transition metal chalcogenide nanosheet material, comprising the following steps:

[0131] (1) Disperse 2mmol of selenium powder in 8mL of hydrazine hydrate and heat to 85°C for 1 hour to fully dissolve the selenium powder.

[0132] Ammonium heptamolybdate tetrahydrate (molybdenum element in the ammonium tetrahydrate ammonium heptamolybdate is 1mmol) is dissolved in the water of 10mL, then adds in the above-mentioned selenium powder solution.

[0133] Add 50ml of saturated brine (25°C) to the solution, stir and heat until the liquid evaporates to dryness.

[0134] (2) In the tube furnace, the mixed solid containing selenium-hydrazine hydrate, ammonium molybdate, and NaCl was placed in an alumina porcelain boat, and placed in the middle of the heating zone of the tube furnace.

[0135] (3) Before heating, first pass Ar / H into the tube furnace 2 Mix the gas and remove the air in the tube. Then the temperature was raised to 600° C. at a heat...

Embodiment 2

[0141] A preparation method of a transition metal chalcogenide nanosheet material, comprising the following steps:

[0142] (1) Disperse 2mmol of selenium powder in 8mL of hydrazine hydrate and heat to 85°C for 1 hour to fully dissolve the selenium powder.

[0143] Ammonium heptamolybdate tetrahydrate (molybdenum element in the ammonium tetrahydrate ammonium heptamolybdate is 1mmol) is dissolved in the water of 10mL, then adds in the above-mentioned selenium powder solution.

[0144] Glucose (the molar mass of element C is 8 mmol) was added to the solution, and 50 ml of saturated saline (25° C.) was continuously added to the solution, stirred and heated until the liquid evaporated to dryness.

[0145] (2) In the tube furnace, put the mixed solid containing selenium-hydrazine hydrate, ammonium molybdate, glucose, and NaCl in an alumina porcelain boat, and place it in the middle of the heating zone of the tube furnace.

[0146] (3) Before heating, first pass Ar / H into the tube ...

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Abstract

The invention provides a transition metal chalcogenide nanosheet material and a preparation method thereof, a battery anode material, a secondary battery and an application thereof, and belongs to thetechnical field of transition metal chalcogenides. The invention provides a preparation method of a transition metal chalcogenide nanosheet material, comprising the following steps: dissolving raw materials in an aqueous solution of soluble salt, removing moisture to obtain a solid, sintering the solid, and washing to obtain a transition metal chalcogenide nanosheet material, wherein the raw materials include a chalcogen precursor and a transition metal precursor. According to the preparation method, the soluble salt is used as a template, is inexpensive, is environmentally friendly and is easy to remove in post-treatment, and the obtained transition metal chalcogenide nanosheet material has a thinner sheet thickness. Compared with a traditional silica template method or a hydrothermal method, the preparation method of the invention greatly shortens the synthesis cycle, is simple and feasible, is controllable, has characteristics of high yield and simple experimental operation, and issuitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of transition metal chalcogenides, and in particular relates to a transition metal chalcogenide nanosheet material and a preparation method thereof, a battery negative electrode material, a secondary battery and applications thereof. Background technique [0002] With the discovery of graphene, graphene-like layered materials have attracted great attention in recent years. Graphene-like layered materials refer to inorganic compounds with a layered crystal structure similar to graphite, mainly including metal chalcogenides, silicene, germanene, boron nitride, etc. In terms of energy storage, transition metal chalcogenides (including transition metal sulfides, transition metal selenides, and transition metal tellurides) are considered ideal materials for battery anodes due to their large interlayer spacing and high specific capacity. Transition metal chalcogenides such as MoS 2 , MoSe 2 , VS 2 , W 2 , WSe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00C01G39/06H01M4/58H01M10/0525H01M10/054B82Y30/00
CPCB82Y30/00C01B19/007C01G39/06C01P2004/20C01P2006/40H01M4/581H01M10/0525H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 唐永炳童小玉欧学武
Owner SHENZHEN INST OF ADVANCED TECH
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