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N-doped carbon layer wrapped hollow-porous nickel oxide composite material and preparation method thereof

A hollow porous, nitrogen-doped carbon technology, used in nanotechnology for materials and surface science, electrochemical generators, electrical components, etc., can solve the problem of poor electronic conductivity and limit the electrochemical performance of nickel oxide. Battery cycle performance , low diffusion rate of lithium ions, etc., to achieve the effects of good discharge performance, easy promotion and large-scale production, and simple and effective preparation methods

Inactive Publication Date: 2014-03-26
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the structural characteristics of nickel oxide itself and the large particle size of materials prepared by traditional methods, the electronic conductivity inside the material is poor, and the diffusion rate of lithium ions in nickel oxide particles is very low, which greatly limits the performance of nickel oxide. Electrochemical properties and cycle performance of batteries

Method used

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  • N-doped carbon layer wrapped hollow-porous nickel oxide composite material and preparation method thereof
  • N-doped carbon layer wrapped hollow-porous nickel oxide composite material and preparation method thereof
  • N-doped carbon layer wrapped hollow-porous nickel oxide composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In 20 mL of ethylene glycol, add 0.895 g of nickel chloride hexahydrate, 1.23 g of sodium acetate, and 1.2 g of urea, respectively, and stir the mixture at 20-25 °C for 3-5 h. After mixing evenly, transfer it into a stainless steel reaction kettle lined with polytetrafluoroethylene, heat at 160-200 °C for 18-24 h, cool to room temperature, and centrifuge the product with ethanol and deionized water for 6-8 times Afterwards, vacuum-dry at 60-100 °C for 12-24 h in a drying oven to obtain precursor nickel bicarbonate nanoparticles with a particle size of about 200-300 nm. Add 30 mg of the precursor to 5 mL of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, and ultrasonically disperse for 5-15 min. Put the dispersed solution in a stainless steel reaction kettle lined with polytetrafluoroethylene, treat it with solvothermal method at 160-200 °C for 3-5 hours, cool to room temperature, centrifuge, and then heat it at 80-120 °C Dry under vacuum for 12-24 h. Place...

Embodiment 2

[0034] In 20 mL of ethylene glycol, 1.0 g of nickel chloride hexahydrate, 1.23 g of sodium acetate, and 0.8 g of urea were added respectively, and the mixture was stirred at 20-25 °C for 3-5 h. After mixing evenly, transfer it into a stainless steel reactor lined with polytetrafluoroethylene, heat at 160-200 °C for 18-24 h, and cool to room temperature. After the product was centrifuged and washed with ethanol and deionized water for 6 to 8 times, it was placed in a drying oven at 60 to 100 °C for 12 to 24 h under vacuum to obtain precursor nickel bicarbonate nanoparticles with a particle size of about 200 to 300 nm . 80 mg of the precursor was added to 10 mL of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, and ultrasonically dispersed for 5-15 min. Put the dispersed solution in a stainless steel reaction kettle lined with polytetrafluoroethylene, treat it with solvothermal method at 160-200 °C for 3-5 hours, cool to room temperature, centrifuge, and then heat i...

Embodiment 3

[0048] The hollow porous nickel oxide composite material wrapped by the nitrogen-doped carbon layer prepared in Example 1 was used to prepare a lithium ion battery according to the following method, and the performance test of the battery was performed on a constant current charge and discharge test system.

[0049] The mass ratio of 70%: 15%: 15% nitrogen-doped carbon layer wrapped hollow porous nickel oxide composite material, acetylene black, PVDF was mixed and ground in a mortar for 20 min, and 1-methyl-2- Pyrrolidone is used as a solvent, stirred to form a uniform slurry, and coated on the foamed copper to prepare a negative electrode sheet. In a glove box filled with argon, a metal lithium sheet was used as the positive electrode, and a 1 mol / L LiPF 6 / EC+DMC (1:1) organic solution is used as electrolyte, assembled into CR2025 button cell. The constant current charge and discharge test of the battery is carried out on the LAND-CT2001A battery test system (range 3.0V / 0.1...

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Abstract

The invention discloses an N-doped carbon layer wrapped hollow-porous nickel oxide composite material, which adopts an ionic liquid as a coating agent to form an N-doped carbon layer after carbonization coated upon a nano nickel oxide surface of a hollow-porous structure with a particle size of 200-300 nm. The preparation method for the composite material comprises the steps as follows: dispersing carbamide, nickel chloride hexahydrate and sodium acetate into ethylene-glycol, conducting a solvothermal reaction and obtaining a precursor body of a spherical carbonic acid hydrogen nickel; dispersing the precursor body into a 1-butyl-3-methylimidazole tetrafluoroborate ionic liquid, treating through adopting a solvothermal method, conducting a thermal treatment with argon gas to the product and obtaining the composite material. The N-doped carbon layer wrapped hollow-porous nickel oxide composite material provided by the invention adopts the unique nano hollow and porous structure, and is small in particle size and good in dispersity, excellent in electric conductivity and electric discharge stability, is applicable to anode materials of lithium ion secondary electrodes; the adopted solvothermal preparation method is simple, economical, and suitable for industrialized mass production.

Description

technical field [0001] The invention relates to a hollow porous nickel oxide composite material wrapped by a nitrogen-doped carbon layer and a preparation method thereof. The composite material can be used as a negative electrode active material of a lithium ion secondary battery, and belongs to the technical fields of material chemistry and energy battery. Background technique [0002] Due to its high energy density, high output voltage, good cycle performance, long service life, and environmental protection, lithium-ion batteries have been widely used in portable electronic products, military industry, aerospace and other fields in recent years. There are also broad prospects in the field of power plant applications for automobiles (EV) and hybrid electric vehicles (HEV), so improving the performance of lithium-ion batteries is a current research hotspot. Among them, the selection of electrode materials is a key factor affecting the performance of lithium-ion batteries. ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52
CPCB82Y30/00B82Y40/00H01M4/366H01M4/523H01M4/625H01M10/0525Y02E60/10
Inventor 蔡称心倪叶猛吴萍印亚静张卉
Owner NANJING NORMAL UNIVERSITY
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