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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the multi-component transition metal selenide materials with different morphologies have high speci

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

Example Embodiment

[0030] Example 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 at room temperature until clear. 20mL of ethylene glycol was added to the prepared acetate solution, mixed uniformly, and then transferred to a hydrothermal reactor, and hydrothermally heated at 180°C for 24h. The resulting product was centrifuged and washed with water and ethanol several times, and then dried at 70°C. Then place 0.2g of the obtained precursor and 2g of selenium powder adjacently in a tube furnace, raise it to 600°C at a heating rate of 5°C / min in a protective atmosphere, and keep it for 4 hours to obtain dumbbell-shaped MnSe / CoSe 2 Composite materials. Analyze the obtained samples with the Rigaku D / max-2500 X-ray diffraction analyzer, and the results are as follows figure 1 As shown, all diffraction peaks of the product correspond to MnSe and CoSe 2 Physical phase. No other impurity peaks are found, indicating that the p...

Example Embodiment

[0032] Example 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 at room temperature until clear. 20mL of ethylene glycol was added to the prepared acetate solution, mixed uniformly, and then transferred to a hydrothermal reaction kettle, and hydrothermally heated at 180°C for 30h. The resulting product was centrifuged and washed with water and ethanol several times, and then dried at 70°C. Then 0.2g of the obtained precursor and 4g of selenium powder were placed adjacently in a tube furnace, and the temperature was raised to 500°C at a heating rate of 5°C / min under a protective atmosphere, and the dumbbell-shaped MnSe / CoSe was obtained after holding for 6 hours. 2 Composite materials. Using the US FEI company's Nova NanoSEM230 scanning electron microscope to observe the sample, it is found that the dumbbell-shaped particles are self-assembled by many secondary particles and have a porous structure, suc...

Example Embodiment

[0034] Example 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 at room temperature until clear. Add 20 mL of ethylene glycol to the prepared acetate solution, mix uniformly, and then transfer to a hydrothermal reactor, and hydrothermally heat at 200°C for 24 hours. The resulting product was centrifuged and washed with water and ethanol several times, and then dried at 70°C. Then 0.2g of the obtained precursor and 4g of selenium powder were placed adjacently in a tube furnace, and the temperature was raised to 500°C at a heating rate of 5°C / min under a protective atmosphere, and the dumbbell-shaped MnSe / CoSe was obtained after holding for 6 hours. 2 Composite materials.

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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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