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

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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

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

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Experimental program
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Example Embodiment

[0031] Example 1

[0032] In 20 mL of ethylene glycol, 0.895 g of nickel chloride hexahydrate, 1.23 g of sodium acetate, and 1.2 g of urea were added respectively, and the mixture was stirred at 20-25 °C for 3-5 h. After mixing uniformly, transfer it into a stainless steel reactor lined with PTFE, heat it at 160-200 °C for 18-24 h, cool to room temperature, and wash the product with ethanol and deionized water centrifugally for 6-8 times Afterwards, it was placed in a drying oven at 60-100 °C and vacuum dried for 12-24 h 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-methylimidazole tetrafluoroborate ionic liquid, and ultrasonically disperse for 5-15 min. Place the dispersed solution in a stainless steel reactor lined with PTFE, solvothermally treat it at 160-200 °C for 3 to 5 h, cool to room temperature, centrifuge, and then pass it at 80-120 °C Dry under vacuum for 12-24 h. Place ...

Example Embodiment

[0033] Example 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 uniformly, transfer it into a stainless steel reactor lined with polytetrafluoroethylene, heat it at 160-200 °C for 18-24 h, and cool to room temperature. After washing the product with ethanol and deionized water for 6-8 times by centrifugation, it is placed in a drying oven at 60-100 °C and vacuum-dried for 12-24 h to obtain precursor nickel bicarbonate nanoparticles with a particle size of about 200-300 nm . Add 80 mg of the precursor to 10 mL of 1-butyl-3-methylimidazole tetrafluoroborate ionic liquid, and ultrasonically disperse for 5-15 min. Place the dispersed solution in a stainless steel reactor lined with PTFE, solvothermally treat it at 160-200 °C for 3 to 5 h, cool to room temperature, centrifuge, and then pass it at 80-120 °C Dry under vacuum...

Example Embodiment

[0047] Example 3

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

[0049] The hollow porous nickel oxide composite material, acetylene black, and PVDF wrapped in a nitrogen-doped carbon layer with a mass ratio of 70%: 15%: 15% were mixed and ground in a mortar for 20 minutes. 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, lithium metal sheets are used as the positive electrode, and 1 mol / L LiPF is used. 6 / EC+DMC(1:1) organic solution is electrolyte, assembled into CR2025 button cell. The constant current charge and discharge test of the battery was performed on the LAND-CT2001A battery test system (r...

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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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