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Nitrogen-doped carbon-coated two-phase staggered distribution type nickel-cobalt bimetal selenide electrode material and preparation method thereof

A nitrogen-doped carbon, staggered distribution technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as restricting the energy storage performance of transition metal selenide-based electrode materials, and achieve the effect of improving electrochemical energy storage performance.

Active Publication Date: 2019-11-01
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to poor electrical conductivity, the energy storage performance of transition metal selenide electrode materials is severely restricted. Therefore, a nitrogen-doped carbon-coated two-phase staggered distribution type nickel-cobalt double metal selenide electrode material was prepared in this paper. Improving the electrochemical energy storage performance of transition metal selenides by the conductivity of hetero-type carbon materials and defects at the two-phase phase boundary

Method used

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  • Nitrogen-doped carbon-coated two-phase staggered distribution type nickel-cobalt bimetal selenide electrode material and preparation method thereof
  • Nitrogen-doped carbon-coated two-phase staggered distribution type nickel-cobalt bimetal selenide electrode material and preparation method thereof
  • Nitrogen-doped carbon-coated two-phase staggered distribution type nickel-cobalt bimetal selenide electrode material and preparation method thereof

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Embodiment 1

[0025] A method for preparing a nitrogen-doped carbon-coated two-phase staggered distribution type nickel-cobalt double metal selenide electrode material, the specific steps are:

[0026] (1) Weigh 232.4 mg of nickel nitrate, 232.4 mg of cobalt nitrate, 1 g of polyvinylpyrrolidone and 150 mg of trimesic acid into 30 mL of N,N-dimethylformamide, dissolve the above mixture by ultrasonic Transfer to a reaction kettle and place in a blast drying oven at 150 °C for 6 h of solvothermal reaction, then cool it down to room temperature naturally, wash it with absolute ethanol for several times, and finally dry the washed product;

[0027] (2) Weigh 100 mg of the centrifuged-dried product of step (1) and 200 mg of melamine and place them in two porcelain boats, and then place them in an argon-hydrogen protected tube furnace for carbonization and nitrogen doping treatment. The temperature is 450 °C, the treatment time is 2 hours, and finally after it is naturally cooled to room temperatu...

Embodiment 2

[0030] A method for preparing a nitrogen-doped carbon-coated two-phase staggered distribution type nickel-cobalt double metal selenide electrode material, the specific steps are:

[0031] (1) Weigh 155 mg of nickel nitrate, 320 mg of cobalt nitrate, 1 g of polyvinylpyrrolidone and 150 mg of trimesic acid into 30 mL of N,N-dimethylformamide, dissolve the above mixture fully by ultrasonic Transfer it to a reaction kettle and place it in a 150°C blast drying oven for 6 h of solvothermal reaction, then cool it down to room temperature naturally, wash it with absolute ethanol for several times, and finally dry the washed product;

[0032] (2) Weigh 100 mg of the centrifuged-dried product of step (1) and 200 mg of melamine and place them in two porcelain boats, and then place them in an argon-hydrogen protected tube furnace for carbonization and nitrogen doping treatment. The temperature is 450 °C, the treatment time is 2 hours, and finally after it is naturally cooled to room tempe...

Embodiment 3

[0035] A method for preparing a nitrogen-doped carbon-coated single-phase distribution type nickel-cobalt double metal selenide electrode material, the specific steps are:

[0036] (1) Weigh 155 mg of nickel nitrate, 320 mg of cobalt nitrate, 1 g of polyvinylpyrrolidone and 150 mg of trimesic acid into 30 mL of N,N-dimethylformamide, dissolve the above mixture fully by ultrasonic Transfer it to a reaction kettle and place it in a 150°C blast drying oven for 6 h of solvothermal reaction, then cool it down to room temperature naturally, wash it with absolute ethanol for several times, and finally dry the washed product;

[0037] (2) Weigh 100 mg of the centrifuged-dried product of step (1) and 200 mg of melamine and place them in two porcelain boats, and then place them in an argon-hydrogen protected tube furnace for carbonization and nitrogen doping treatment. The temperature is 450 °C, the treatment time is 2 hours, and finally after it is naturally cooled to room temperature,...

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Abstract

The invention discloses a nitrogen-doped carbon-coated two-phase staggered distribution type nickel-cobalt bimetal selenide electrode material and a preparation method thereof, and belongs to the field of preparation of electrode materials for lithium ion batteries. The preparation method comprises the following steps of: using nickel nitrate and cobalt nitrate as a metal source, using trimesic acid as an organic ligand, preparing a nickel-cobalt bimetal organic framework compound by adopting a solvothermal method; and putting the obtained nickel-cobalt bimetal precursor and melamine commonlyinto a tube furnace at a temperature of 450 DEG C for calcination for 2h to complete the carbonization and nitrogen doping process so as to obtain a nitrogen-doped carbon-coated nickel-cobalt bimetalsimple substance; and using selenium powder as a selenium source to converting the nitrogen-doped carbon-coated nickel-cobalt bimetal simple substance after calcination to the nitrogen-doped carbon-coated two-phase staggered distribution type nickel-cobalt bimetal selenide electrode material. The nitrogen-doped carbon-coated two-phase staggered distribution type nickel-cobalt bimetal selenide electrode material and the preparation method thereof have the high specific capacitance, the excellent rate performance and the cycle stability.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials for lithium ion batteries, and in particular relates to a nitrogen-doped carbon-coated two-phase interlaced distribution type nickel-cobalt double-metal selenide electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are electrochemical energy storage devices that rely on lithium-ion intercalation and extraction processes for charge storage. It has the advantages of high specific energy, light weight, environmental protection and no pollution, small self-discharge, no memory effect and long service life, so it is widely used in all aspects of life. Theoretically, lithium ions can be intercalated and extracted infinitely between the positive and negative electrode materials. However, the actual lithium ion intercalation and extraction process will damage the microstructure of the electrode material, resulting in poor cycle performan...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/581H01M4/583H01M10/0525Y02E60/10
Inventor 詹红兵权亮谢玉兰陈奇俤蔡道平
Owner FUZHOU UNIV
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