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Molybdenum selenide based composite cathode material for sodium-ion battery and preparation method thereof

A technology for sodium ion battery and composite material, which is applied to the field of sodium ion battery molybdenum selenide-based negative electrode composite material and its preparation field, can solve the problems of limited application, single structure, large size of molybdenum selenide material, etc. Reproducible, low-cost results

Inactive Publication Date: 2015-10-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently synthesized molybdenum selenide material is too large and has a single structure, which limits its application in sodium-ion batteries.

Method used

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  • Molybdenum selenide based composite cathode material for sodium-ion battery and preparation method thereof
  • Molybdenum selenide based composite cathode material for sodium-ion battery and preparation method thereof
  • Molybdenum selenide based composite cathode material for sodium-ion battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] 0.07g of sodium selenite, 0.6g of glucose, 0.023g of potassium borohydride and 0.08g of polyvinylpyrrolidone were added to the aqueous solution and reacted for 24h under hydrothermal conditions at 175°C to obtain a selenium / carbon linear composite material. Then 0.35g of selenium / carbon linear composite material was added into 40ml aqueous solution and ultrasonically dispersed for 40min to obtain a dispersion liquid. After adding 0.165g potassium borohydride and 0.42g sodium molybdate to the dispersion liquid and fully dissolving them, the React in a reactor. After the reaction product is washed and dried at 70° C., the precursor of the molybdenum selenide / hollow carbon nanofiber negative electrode composite material is obtained. After calcining at 600°C for 2 hours under inert atmosphere conditions, the diameter is 100-300nm, the length is 1-5μm, and the specific surface area is 300m2. 2 g -1 , molybdenum selenide length of 15.7nm, width of 2.5nm molybdenum selenide ...

Embodiment 2

[0053] 0.1g of selenium dioxide, 0.7g of glucose, 0.2g of sodium sulfite and 0.09g of polyvinylpyrrolidone were added to the aqueous solution, and the selenium / carbon linear composite material was obtained after reacting for 24 hours under hydrothermal conditions at 175°C. Then add 0.3g of selenium / carbon linear composite material into 50ml of aqueous solution and ultrasonically disperse for 45min to obtain a dispersion liquid. After adding 0.39g of sodium sulfite and 0.45g of molybdenum trichloride into the dispersion liquid and fully dissolving them, the reaction at 205°C reaction in the kettle. After the reaction product is washed and dried at 70° C., the precursor of the molybdenum selenide / hollow carbon nanofiber negative electrode composite material is obtained. After calcining at 800°C for 3 hours in an inert atmosphere, the obtained product has a diameter of 200-500nm, a length of 5-8μm, and a specific surface area of ​​400m2. 2 g -1 A molybdenum selenide / hollow carb...

Embodiment 3

[0057] Add 0.1g of selenium dioxide, 0.7g of melamine, 0.2g of sodium sulfite and 0.09g of sodium dodecylbenzenesulfonate into the aqueous solution, and react under hydrothermal conditions at 175°C for 24 hours to obtain a selenium / carbon linear composite material. Then 0.3g of selenium / carbon linear composite material was added to 35ml of aqueous solution and ultrasonically dispersed for 45min to obtain a dispersion liquid. After adding 0.019g of sodium borohydride and 0.45g of molybdenum phosphate into the dispersion liquid and fully dissolving them, the reaction at 205°C reaction in the kettle. After the reaction product is washed and dried at 70° C., the precursor of the molybdenum selenide / hollow carbon nanofiber negative electrode composite material is obtained. After calcining at 700°C for 2 hours in an inert atmosphere, the obtained product has a diameter of 300-500nm, a length of 3-6μm, and a specific surface area of ​​200m2. 2 g -1， molybdenum selenide / hollow carbo...

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Abstract

The invention discloses a molybdenum selenide based composite cathode material for a sodium-ion battery and a preparation method thereof. The cathode material is a composite material which is of a three-dimensional net structure and is formed by molybdenum selenide evenly growing on the surface of hollow carbon nanofiber. The preparation method comprises the steps of adopting a hydrothermal method to synthesize a precursor of the hollow carbon nanofiber, using the precursor of the hollow carbon nanofiber as a selenium source, a carbon source and a template, evenly dispersing the precursor in the mixed solution prepared by ethyl alcohol and water, adding a reducing agent and a molybdenum source into the mixed solution, performing hydrothermal reaction, cooling and drying a product to be at the room temperature so as to obtain the precursor of a molybdenum selenide / hollow carbon nanofiber composite material, and performing high-temperature calcination processing to obtain the molybdenum selenide / hollow carbon nanofiber composite material. The preparation method is simple, reliable, good in process repeatability and in operability and low in cost and is suitable for industrial production. The molybdenum selenide based composite cathode material is used for the sodium-ion battery and has good electrochemical performance.

Description

technical field [0001] The invention relates to a molybdenum selenide-based negative electrode composite material for a sodium ion battery and a preparation method thereof, belonging to the field of sodium ion batteries. Background technique [0002] With the reduction of non-renewable energy sources and increasingly severe environmental problems, the demand for small separated mobile power sources is growing explosively, and various rechargeable electrochemical power sources are receiving more and more attention. Especially since the advent of new chemical power lithium-ion batteries in the 1990s, as the third generation of rechargeable batteries, they have attracted much attention due to their excellent performance such as large specific energy, good cycle performance, high working voltage, long life and low pollution, and have been widely used. Used in hybrid electric vehicles, electric energy storage devices, mobile electronic devices. Lithium consumption has also incre...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/581H01M4/625H01M10/054Y02E60/10
Inventor 张治安杨幸付云史晓东
Owner CENT SOUTH UNIV
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