Carbon nano-sphere/NiCo2O4 composite material as well as preparation method and application thereof

A technology of carbon nanospheres and composite materials, applied in hybrid capacitor electrodes, structural parts, electrical components, etc., can solve the problems of not being able to keep up with functional requirements, limit the total specific capacity, etc., and achieve the effect of excellent charge and discharge performance and high capacity

Active Publication Date: 2015-10-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, although graphite guarantees the cycle performance of lithium-ion batteries, it greatly limits it...

Method used

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  • Carbon nano-sphere/NiCo2O4 composite material as well as preparation method and application thereof
  • Carbon nano-sphere/NiCo2O4 composite material as well as preparation method and application thereof
  • Carbon nano-sphere/NiCo2O4 composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 0.1 g of glucose and add it to 20 mL of distilled water to fully dissolve it, and transfer it to a 25 mL reaction kettle; then heat it to 200° C. and keep it for 24 hours. After being cooled to room temperature, washed with distilled water and ethanol for several times, and dried at 60° C. for 4 hours to obtain carbon nanospheres. Take 10 mg of carbon nanospheres and mix with 1 mL of sodium oleate with a concentration of 1 mg / mL, fully disperse by ultrasonic for 1 hour, and then add 1 g of urea and 0.001 mol of cobalt nitrate and 0.0005 mol of nickel nitrate in a molar ratio of 2:1. The mixed solution was stirred at 60°C for 2 hours to obtain a homogeneous solution. Transfer to the autoclave and keep at 120°C for 6 hours. After cooling down to room temperature, rinse with distilled water and ethanol for several times, and bake under vacuum at 60°C for 4 hours. Finally, it was heated to 350 °C in a furnace for 2 hours to obtain carbon nanospheres / NiCo with a core-...

Embodiment 2

[0030] Take 1 g of glucose and add it to 20 mL of distilled water to fully dissolve, and transfer it to a 25 mL reaction kettle. It was then heated to 200°C for 24 hours. After cooling to room temperature, washed with distilled water and ethanol for many times, and dried at 60 °C for 4 hours to obtain carbon nanospheres; take 10 mg of carbon nanospheres and mix with 10 mL of sodium oleate with a concentration of 1 mg / mL, and fully sonicate for 1 hour. After dispersion, 10 g of urea and 0.01 mol of cobalt nitrate and 0.005 mol of nickel nitrate in a molar ratio of 2:1 were added. The mixed solution was stirred at 60°C for 2 hours to obtain a homogeneous solution. Transfer to the autoclave and keep at 180°C for 12 hours. After cooling down to room temperature, rinse with distilled water and ethanol for several times, and bake under vacuum at 60°C for 4 hours. Finally, it was heated to 350 °C in a furnace for 2 hours to obtain carbon nanospheres / NiCo with a core-shell structur...

Embodiment 3

[0032] Take 0.5g of glucose and add it to 20mL of distilled water to fully dissolve, and transfer it to a 25mL reaction kettle. It was then heated to 200°C for 24 hours. After cooling to room temperature, washed with distilled water and ethanol for several times, and dried at 60°C for 4 hours to obtain carbon micro-nanospheres; take 10mg of carbon nanospheres and mix them with 5mL of sodium oleate with a concentration of 1mg / mL, and ultrasonically for 1 hour After sufficient dispersion, 15 g of urea and 0.1 mmol of cobalt nitrate and 0.05 mmol of nickel nitrate in a molar ratio of 2:1 were added. The mixed solution was stirred at 60°C for 2 hours to obtain a homogeneous solution. Transfer to the autoclave and keep at 180°C for 24 hours. After cooling down to room temperature, rinse with distilled water and ethanol for several times, and bake under vacuum at 60°C for 4 hours. Finally, it was heated to 350 °C in a furnace for 2 hours to obtain carbon nanospheres / NiCo with a c...

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Abstract

The invention relates to a high-energy-density carbon nano-sphere/NiCo2O4 composite material of a lithium ion battery and a super-capacitor as well as a preparation method and application of the composite material. The nano-sphere/NiCo2O4 composite material is a core-shell structure nano sphere with the grain diameter of 100-300nm; and the inner layer of the nano-sphere/NiCo2O4 composite material is a carbon nano sphere with the grain diameter of 50-200nm and the outer layer of the nano-sphere/NiCo2O4 composite material is a NiCo2O4 coating layer with the thickness of 20-100nm. The preparation method comprises the following steps: mixing the carbon nano sphere with the grain diameter of 50-200nm with sodium oleate and uniformly dispersing by ultrasounds; then adding weak alkali, Co<2+> and Ni<2+>; and uniformly mixing, then carrying out hydrothermal treatment to obtain the carbon nano-sphere/NiCo2O4 composite material with the core-shell structure. The method has the advantages of simplicity in operation, environment friendliness, wide raw material resource, low production cost and the like, and is suitable for large-scale production and preparation. The first-time discharge capacity of a lithium ion battery negative electrode material prepared from the material can reach 1600mAh/g. The material is used as a super-capacitor electrode material and has the specific capacitance being up to 1420F/g (1A/g).

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries and supercapacitors, and in particular relates to a high energy density carbon nanosphere / NiCo used in lithium ion batteries and supercapacitors 2 O 4 Composite material and its preparation method and application. Background technique [0002] Since the first commercialized lithium-ion battery product was launched by SONY in Japan in 1991, it has been more than 20 years since the development of lithium-ion battery. Lithium-ion batteries have a unique charging and discharging mechanism of inserting / extracting lithium ions, so compared with similar battery products, they have high voltage, high specific energy, long charge and discharge life, no memory effect, less environmental pollution, fast charging, self- Advantages such as low discharge rate. The development of negative electrode materials as the main lithium storage body of lithium ion batteries has become a key point to impr...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/583H01M10/0525H01G11/36H01G11/50
CPCH01M4/52H01M4/583H01M10/0525Y02E60/10
Inventor 潘春旭黎德龙龚佑宁余超智张豫鹏
Owner WUHAN UNIV
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