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MnSe/CoSe2 composite material and preparation method and applications thereof

A composite material, acetate technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of poor cycle performance, limited application, fast decay speed, etc., to achieve high tap density, simple and easy process The effect of lines and close contact with each other

Active Publication Date: 2018-09-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the multi-component transition metal selenide materials with different morphologies have high specific capacity, their cycle performance is poor and their decay rate is fast, which greatly limits their application.

Method used

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  • MnSe/CoSe2 composite material and preparation method and applications thereof
  • MnSe/CoSe2 composite material and preparation method and applications thereof
  • MnSe/CoSe2 composite material and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add manganese acetate, cobalt acetate, and urea into 10 mL of deionized water at a molar ratio of 1.2:2:9, and stir until clarification at room temperature. Add 20 mL of ethylene glycol into the prepared acetate solution, mix well, then transfer to a hydrothermal reaction kettle, and heat at 180° C. for 24 h. The resulting product was centrifuged and washed several times with water and ethanol, then dried at 70°C. Then 0.2 g of the obtained precursor was placed adjacent to 2 g of selenium powder in a tube furnace, and the heating rate was raised to 600 °C under a protective atmosphere at a rate of 5 °C / min, and then kept for 4 h to obtain a dumbbell-shaped MnSe / CoSe 2 composite material. Adopt Japanese science D / max-2500 type X-ray diffraction analyzer to analyze gained sample, obtained result is as follows figure 1 As shown, all the diffraction peaks of the product correspond to MnSe and CoSe 2 phase. No other impurity peaks were found, indicating that the purity o...

Embodiment 2

[0033] Add manganese acetate, cobalt acetate, and urea into 10 mL of deionized water at a molar ratio of 1.2:2:9, and stir until clarification at room temperature. Add 20 mL of ethylene glycol into the prepared acetate solution, mix well, then transfer to a hydrothermal reaction kettle, and heat at 180° C. for 30 h. The resulting product was centrifuged and washed several times with water and ethanol, then dried at 70°C. Then 0.2 g of the obtained precursor was placed adjacent to 4 g of selenium powder in a tube furnace, and the heating rate was raised to 500 °C under a protective atmosphere at a rate of 5 °C / min, and then kept for 6 h to obtain a dumbbell-shaped MnSe / CoSe 2composite material. Observing the sample with the Nova NanoSEM230 scanning electron microscope of FEI Company in the United States, it was found that the dumbbell-shaped particles were self-assembled by many secondary particles and had a porous structure, such as Figure 4 shown.

Embodiment 3

[0035] Add manganese acetate, cobalt acetate, and urea into 10 mL of deionized water at a molar ratio of 1.2:5:20, and stir until clarification at room temperature. Add 20 mL of ethylene glycol into the prepared acetate solution, mix well, then transfer to a hydrothermal reaction kettle, and heat at 200°C for 24 hours. The resulting product was centrifuged and washed several times with water and ethanol, then dried at 70°C. Then 0.2 g of the obtained precursor was placed adjacent to 4 g of selenium powder in a tube furnace, and the heating rate was raised to 500 °C under a protective atmosphere at a rate of 5 °C / min, and then kept for 6 h to obtain a dumbbell-shaped MnSe / CoSe 2 composite material.

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Abstract

The invention discloses a preparation method of a MnSe / CoSe2 composite material. The preparation method comprises following steps: (1) adding manganese acetate, cobalt acetate, and urea into deionizedwater according to a certain mole ratio, and stirring to obtain an acetate solution; (2) adding a certain amount of organic solvent that can be easily dissolved in water into the acetate solution prepared in the step (1), fully mixing, transferring the mixed solution to a hydrothermal reactor, and carrying out hydrothermal reactions to obtain a precursor; and (3) washing and drying the precursorobtained in the step (2), separately placing the precursor and selenium powder in a tube furnace, and burning the precursor and selenium powder in a protective atmosphere for a while to obtain a finalproduct. The invention also discloses a MnSe / CoSe2 composite material, which is prepared by the provided preparation method and is in a porous dumbbell shape, and applications thereof. The preparation method can prepare the micrometer level MnSe / CoSe2 composite material in a porous dumbbell shape. The circulation performance of a lithium ion battery is greatly improved, after the MnSe / CoSe2 composite material is used as the negative material of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials for lithium ion batteries, and in particular relates to a MnSe / CoSe 2 Composite materials and their preparation methods and applications. Background technique [0002] Transition metal compounds have attracted great attention because of their high theoretical specific capacity, abundant reserves, and mature preparation technology. However, there are many problems when traditional transition metal selenides are used as anode materials for lithium-ion batteries, such as poor conductivity, fast capacity decay, and low first-cycle Coulombic efficiency. Compared with selenides, transition metal selenides have better electrical conductivity and chemical stability, so they can show better lithium storage performance. Compared with single-element selenides, multi-element transition metal selenides usually contain two or more transition metals. In the process of lithiu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/364H01M4/581H01M10/0525Y02E60/10
Inventor 朱挺刘亚东刘国强
Owner CENT SOUTH UNIV
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