Double-layer carbon coating-metal selenide composite electrode material and preparation method thereof

A metal selenide, composite electrode technology, applied in active material electrodes, negative electrodes, battery electrodes, etc., can solve the problems of long preparation cycle, complex preparation process, poor cycle stability and rate performance, etc., to improve electrical conductivity, The effect of good overall performance, improved stability and rate performance

Active Publication Date: 2020-10-16
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

Method used

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  • Double-layer carbon coating-metal selenide composite electrode material and preparation method thereof
  • Double-layer carbon coating-metal selenide composite electrode material and preparation method thereof
  • Double-layer carbon coating-metal selenide composite electrode material and preparation method thereof

Examples

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 coating-metal selenide composite electrode material and a preparation method thereof. Selenium powder and phthalocyanine salt are adopted as preparationraw materials, and the addition weight ratio of the selenium powder to the phthalocyanine salt is controlled, so that the prepared composite electrode material has relatively high cycling stability and rate capability. In the preparation process, the raw materials are firstly ground and mixed, two-stage stepped heating heat treatment is then carried out in a tubular furnace, meanwhile, with chemical vapor deposition of an organic solvent, the prepared metal selenide composite electrode material forms the double-layer double-function carbon coating-metal selenide, and the prepared composite electrode material has good comprehensive performance by controlling the reaction temperature, the organic solvent loading rate and other process parameters in the whole reaction process. The preparationmethod is simple in technological process, short in period, easy to control and convenient for industrial 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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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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