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A carbon-coated nickel disulfide material and its preparation method and application as a negative electrode material for sodium-ion batteries

A technology of carbon coating and nickel salt, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as volume expansion and structural collapse

Active Publication Date: 2020-10-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] When the existing transition metal sulfide (TMS) is used as a sodium-ion battery, problems such as volume expansion and structural collapse will occur during the charging and discharging process of the sodium-ion battery. The first purpose of the present invention is to provide a battery with an outer layer NiS coated with carbon layer 2 material, which has good sodium storage performance, high conductivity, and can well solve the problem of volume expansion in the process of sodium storage

Method used

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  • A carbon-coated nickel disulfide material and its preparation method and application as a negative electrode material for sodium-ion batteries
  • A carbon-coated nickel disulfide material and its preparation method and application as a negative electrode material for sodium-ion batteries
  • A carbon-coated nickel disulfide material and its preparation method and application as a negative electrode material for sodium-ion batteries

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preparation example Construction

[0041] Ni(DMG) 2 Preparation: Dissolve 2.00g of dimethylglyoxime in 200mL of ethanol as solution A, 2.04g of NiCl 2 ·6H 2 O was dissolved in 50mL deionized water and recorded as solution B, and the pH value was adjusted to 8.5. Under magnetic stirring, add A dropwise to B, and continue stirring for 5 minutes after the dropwise addition, and keep the temperature below 5°C throughout the process. After the obtained product was washed several times with deionized water and ethanol, it was vacuum-dried at 80°C for 12 hours to obtain red Ni(DMG) 2 .

[0042] NeS 2 : 0.2g rod-shaped Ni(DMG) 2 Mix with 0.4g sublimated sulfur in a mortar and grind for 20min, then place in a magnetic boat, under N 2 Under protected conditions, at 5°C min -1 The rate is raised to 300°C for 1h, and then at 2°C min -1 The rate is raised to 500 °C for 2 h to obtain carbon / NiS 2 composite material. The composite material is not a carbon-coated material, but a mixed material of carbon and nickel di...

Embodiment 1

[0044] Ni(DMG) 2 Preparation: Dissolve 2.00g of dimethylglyoxime in 200mL of ethanol as solution A, 2.04g of NiCl 2 ·6H 2 O was dissolved in 50mL deionized water and recorded as solution B, and the pH value was adjusted to 8.5. Under magnetic stirring, add A dropwise to B, and continue stirring for 5 minutes after the dropwise addition, and keep the temperature below 5°C throughout the process. After the obtained product was washed several times with deionized water and ethanol, it was vacuum-dried at 80°C for 12 hours to obtain red Ni(DMG) 2 .

[0045] Carbon coated NiS 2 Preparation: Dissolve 0.9313g aniline and 0.75g tartaric acid in 150mL deionized water, add 0.9g Ni(DMG) 2 , after stirring for 30 min under ice bath conditions, add 50 mL of 0.2 mol / L ammonium persulfate solution pre-placed in ice bath, continue stirring for 6 h under ice bath conditions, and wash the obtained product several times with deionized water and ethanol , after vacuum drying at 80℃ for 12h,...

Embodiment 2

[0047] Ni(DMG) 2 Preparation: Dissolve 2.00g of dimethylglyoxime in 200mL of ethanol as solution A, 2.04g of NiCl 2 ·6H 2 O was dissolved in 50mL deionized water and recorded as solution B, and the pH value was adjusted to 9.0. Under magnetic stirring, add A dropwise to B, and continue stirring for 5 minutes after the dropwise addition, and keep the temperature below 5°C throughout the process. After the obtained product was washed several times with deionized water and ethanol, it was vacuum-dried at 80°C for 12 hours to obtain red Ni(DMG) 2 .

[0048] Carbon coated NiS 2 Preparation: Dissolve 0.9313g aniline and 0.75g tartaric acid in 150mL deionized water, add 0.9g Ni(DMG) 2 , after stirring for 30 min under ice bath conditions, add 50 mL of 0.2 mol / L ammonium persulfate solution pre-placed in ice bath, continue stirring for 6 h under ice bath conditions, and wash the obtained product several times with deionized water and ethanol , after vacuum drying at 80℃ for 12h,...

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Abstract

The invention discloses a carbon-coated NiS2 material, a preparation method thereof and an application thereof as a negative electrode material of a sodium ion battery. The preparation process of thecarbon-coated NiS2 material comprises the steps of synthesizing a Ni ( DMG) 2 rodlike structure through coordination reaction for butanedione oxime and nickel salt; coating the surface of the rod-shaped structure of the Ni ( DMG) 2 with polyaniline through in-situ polymerization, to obtain a Ni ( DMG) 2 rod-like structure @ polyaniline compound; mixing the Ni ( DMG) 2 rodlike structure @ polyaniline compound with the elemental sulfur, then placing them under a protective atmosphere, and carrying out calcining treatment to obtain the carbon-coated NiS2 material. The material is used as a sodium-ion battery negative electrode material, exhibiting excellent electrochemical performance, and still has a capacity of 581 mAh g / 1 after being charged and discharged at a current density of 0.1 A g-1 after 100 cycles. The preparation method of the carbon-coated NiS2 material is simple, easy to control the conditions, shorting the production cycle, lowering the cost, and is applicable to industrial production.

Description

technical field [0001] The invention relates to a carbon-coated NiS 2 materials, especially Ni(DMG) formed from diacetyl and nickel 2 Rod-like structures form carbon-coated NiS by in-situ coating of polyaniline and vulcanization and carbonization 2 materials, especially when it comes to carbon-coated NiS 2 The application of the material as the negative electrode material of the sodium ion battery belongs to the technical field of the sodium ion battery. Background technique [0002] Energy and environmental issues are the most concerned issues in the world today. In the past few decades, lithium-ion batteries have been widely used due to their advantages such as high energy density, long cycle life, and low environmental pollution. However, the reserves of lithium in the earth's crust are low, so it is bound to be unable to meet the needs of the power battery and large-scale energy storage fields that have emerged in recent years. Therefore, it is extremely important to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5815H01M4/62H01M4/625H01M10/054Y02E60/10
Inventor 纪效波张杨侯红帅赵刚刚
Owner CENT SOUTH UNIV