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A kind of double-layer carbon-coated-metal selenide composite electrode material and preparation method thereof

A metal selenide and composite electrode technology, which is applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., can solve the problems of long preparation period, complicated preparation process, poor cycle stability and rate performance, and achieve improved conductivity, Good overall performance, improved stability and rate performance effects

Active Publication Date: 2021-11-02
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of metal selenide composite materials with poor cycle stability and rate performance, complex preparation process and long preparation cycle in the prior art, and provide a double-layer carbon-coated metal selenide composite electrode Material and preparation method thereof; the double-layer carbon coating-metal selenide composite electrode material has high cycle stability and rate performance, simple preparation process, short preparation cycle, and is convenient for industrialization

Method used

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  • A kind of double-layer carbon-coated-metal selenide composite electrode material and preparation method thereof
  • A kind of double-layer carbon-coated-metal selenide composite electrode material and preparation method thereof
  • A kind of double-layer carbon-coated-metal selenide composite electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Preparation of C-coated-COSe / NC composite material, the preparation process is as follows figure 1 shown.

[0035] (1) Accurately weigh 0.2 g of cobalt phthalocyanine and 0.4 g of selenium powder and place them in a mortar, grind them for 20 minutes to mix them evenly, and then transfer the mixed powders to a quartz boat.

[0036] (2) Put the quartz boat into the tube furnace and heat it to 270°C at a heating rate of 4°C / min. After 15 minutes, heat it to 650°C at a heating rate of 5°C / min while passing a constant flow rate of 73sccm Nitrogen gas and ethanol vapor were blown into the tube furnace for a full reaction for 5 hours. After cooling to room temperature, the obtained black powder was washed with deionized water and dried in an oven to obtain a COSe / NC / C composite material.

[0037] The obtained COSe / NC / C composite was characterized by X-ray diffraction, and the results were as follows: figure 2 Shown; Carry out the scanning electron microscope characterizatio...

Embodiment 2

[0040] (1) Accurately weigh 1.0 g of iron phthalocyanine and 1.4 g of selenium powder in a mortar, grind for 22 minutes to mix them evenly, and then transfer the mixed powder to a quartz boat.

[0041] (2) Put the quartz boat into the tube furnace and heat it up to 280°C at a heating rate of 5°C / min. After 20 minutes, heat it up to 800°C at a heating rate of 5°C / min, and at the same time pass a constant flow rate of 75sccm The nitrogen gas blows ethanol vapor into the tube furnace to fully react for 4.5 hours. After cooling to room temperature, the obtained black powder is washed with deionized water and dried in an oven to obtain a double-layer carbon-coated-metal selenide compound. electrode material.

[0042] The obtained double-layer carbon-coated-metal selenide composite electrode material was made into a button battery, and its performance was tested with a battery test system. Under the current density of 1000mA / g, the discharge specific capacity reached 621mAh / after 4...

Embodiment 3

[0044] (1) Accurately weigh 1.0 g of nickel phthalocyanine and 1.5 g of selenium powder in a mortar, grind for 30 min to mix them evenly, and then transfer the mixed powder to a quartz boat.

[0045] (2) Put the quartz boat into the tube furnace and heat it to 300°C at a heating rate of 3°C / min. After 20 minutes, heat it to 750°C at a heating rate of 4°C / min, and pass a constant flow rate of 78sccm at the same time. The nitrogen gas blows ethanol vapor into the tube furnace to fully react for 5 hours. After cooling to room temperature, the obtained black powder is washed with deionized water and dried in an oven to obtain a double-layer carbon-coated-metal selenide compound. electrode material.

[0046] The obtained double-layer carbon-coated-metal selenide composite electrode material was made into a button battery, and its performance was tested with a battery test system. Under the current density of 1000mA / g, the discharge specific capacity reached 678mAh / after 400 cycles...

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Abstract

The invention relates to a double-layer carbon-coated-metal selenide composite electrode material and a preparation method thereof. Selenium powder and phthalocyanine salt are used as raw materials for preparation, and the addition weight ratio of the two is controlled, so that the prepared composite electrode material has high cycle stability and rate performance. In the preparation process, the raw materials are firstly ground and mixed, and then heat-treated in a tube furnace in two steps, accompanied by chemical vapor deposition of organic solvents, so that the prepared metal selenide composite electrode material forms a double-layer dual-function electrode material. Carbon-coated metal selenide, and by controlling the process parameters such as reaction temperature and organic solvent loading rate during the whole reaction process, the prepared composite electrode material has good comprehensive performance. The preparation process of the invention is simple, the cycle is short, easy to control, and convenient for industrialized popularization and production.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials for lithium ion batteries, and in particular relates to a double-layer carbon coating-metal selenide composite electrode material and a preparation method thereof. Background technique [0002] Over the past few decades, rechargeable Li-ion batteries have attracted much attention as power sources for various portable electronic devices and large-scale energy storage devices. Transition metal selenides (MSe x ) is considered to be one of the more potential anode materials for lithium-ion batteries due to its high theoretical capacity and abundant sources. However, similar to other high-capacity electrode materials with conversion reactions, MSe x There will be a large volume change that will cause the rupture and pulverization of the electrode material, which will lead to the formation of dead lithium and the detachment of the active material from the current collector, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525
CPCH01M4/581H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 段军飞曹晨浩吴应泷许嘉雄
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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