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Transition metal selenide-carbon composite material, preparation method and application thereof

A technology of carbon composite materials and transition metals, applied in the direction of metal selenide/telluride, chemical instruments and methods, binary selenium/tellurium compounds, etc., can solve the problems of rapid volume expansion and poor electrochemical performance, and achieve structural Effects of optimization, improved conductivity, and broad research fields

Pending Publication Date: 2021-11-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, transition metal selenides will rapidly expand in volume during cycling, resulting in poor electrochemical performance.

Method used

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  • Transition metal selenide-carbon composite material, preparation method and application thereof
  • Transition metal selenide-carbon composite material, preparation method and application thereof
  • Transition metal selenide-carbon composite material, preparation method and application thereof

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preparation example Construction

[0028] A preparation method of a transition metal selenide-carbon composite material, comprising the steps of:

[0029] 1) Preparation of cobalt selenide precursor: Dissolve cobalt source and carbon source in a mixed solution of deionized water, methanol and ethylene glycol according to a certain ratio, stir evenly, centrifuge, separate and dry, and dry the dried product at high temperature Calcination to obtain Co-MOF, an organometallic framework structure cobalt selenide precursor containing cobalt.

[0030] Wherein, the cobalt source is at least one of cobalt acetate, cobalt nitrate and cobalt sulfate, and the total amount is between 0.01-0.02 mol. The carbon source is at least one of 1,3,5-trisenetricarboxylic acid, polyvinylpyrrolidone (PVP), sucrose, and ascorbic acid, and the added amount of the carbon source is 6-12wt% of the total mass of the cobalt source. In the mixed solution, the volume ratio of deionized water, methanol and ethylene glycol is 30-60:100-200:100-2...

Embodiment 1

[0034] Weigh 1.405g of cobalt sulfate, 1.455g of cobalt nitrate, 2.49g of cobalt acetate, and 0.5g of melamine with a balance. Move it into a beaker with a volume of 500mL, then add 160mL of deionized water, 70mL of ethylene glycol and 70mL of methanol, and stir magnetically for 8h at a speed of 200r / min. Then the product was left to stand, and the supernatant liquid was removed, washed with deionized water for 3 times with a centrifuge at a speed of 7500 r / min, and dried in an environment of 80°C.

[0035] The above product was placed in a corundum ark, in an argon flow at a flow rate of 80mL / min, at 650°C, the heating rate was set to 2°C / min, after calcination at high temperature for 6 hours, it was slowly lowered to room temperature with furnace cooling, and the cobalt selenide precursor was obtained Bulk Co-MOFs. Weigh 120mg of Co-MOF and place it on one side of the corundum ark, and place 400mg of selenium powder on the other side. In an argon flow with a flow rate of 3...

Embodiment 2

[0039]Weigh 1.405g of cobalt sulfate, 2.49g of cobalt acetate, and 0.35g of 2-methylimidazole with a balance. Move it into a beaker with a volume of 500mL, then add 200mL of deionized water, 50mL of ethylene glycol and 50mL of methanol, and stir magnetically for 10h at a speed of 180r / min. Then the product was left to stand, and the supernatant liquid was removed, washed with deionized water for 3 times with a centrifuge at a speed of 7500 r / min, and dried in an environment of 80°C.

[0040] Put the above product in a corundum ark, in an argon flow at a flow rate of 100mL / min, set the heating rate at 2°C / min at 700°C, and after calcination at high temperature for 6 hours, slowly cool down to room temperature with furnace cooling to obtain a cobalt selenide precursor Bulk Co-MOFs. Weigh 150mg of Co-MOF and place it on one side of the corundum ark, and place 450mg of selenium powder on the other side. In an argon flow with a flow rate of 30 mL / min, the heating rate was set at ...

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Abstract

The invention relates to the technical field of preparation of new energy electrode materials, in particular to a transition metal selenide-carbon composite material, a preparation method and application thereof. The preparation method comprises the following steps: 1, dissolving a cobalt source and a carbon source in a mixed solution of deionized water, methyl alcohol and ethylene glycol, uniformly stirring, carrying out centrifugation, separating, drying, and calcining the dried product at a high temperature to obtain a cobalt selenide precursor Co-MOF of an organic metal frame structure containing metal cobalt; and 2) placing the cobalt selenide precursor Co-MOF and selenium powder in a corundum ark, carrying out high-temperature calcination in argon flow for a period of time, and washing and drying the calcined product to obtain a target product. According to the invention, Co-MOF is synthesized, then the temperature is raised in a test tube furnace to synthesize the Co / C composite material, and finally selenium powder is introduced to obtain the CoSe2 / C composite material which has a relatively large specific surface area; and the conductivity of the modified material is improved, the structure of the material is optimized, and the comprehensive electrochemical performance of the material is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of new energy electrode materials, in particular to a transition metal selenide-carbon composite material and its preparation method and application. Background technique [0002] Lithium-ion secondary batteries are regarded as advanced energy storage and conversion devices, which have the advantage of high energy density and can meet the strict requirements of energy storage in different occasions. Lithium-ion batteries are not only used in new energy vehicles, electronic products and other fields, but also have good application prospects in aerospace. In addition, because carbon neutrality is the healthy basis for the mass production and application of new energy vehicles, lithium-ion batteries are widely used, which brings a lot of convenience to our lives, but the specific capacity of commercial lithium-ion batteries is low and safe The performance is poor, so it is necessary to develop n...

Claims

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Application Information

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IPC IPC(8): C01B19/04C01B32/00H01M4/58H01M4/62H01M10/0525
CPCC01B19/007C01B32/00H01M4/581H01M4/625H01M10/0525C01P2004/80C01P2006/12C01P2006/40Y02E60/10
Inventor 李俊哲孙文超汪超李林玮孔祥升
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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