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Preparation method of carbon-coated Co and Ni composite oxide nano-particles

A composite oxide and nanoparticle technology, applied in the field of material chemistry, can solve the problems of high rate, long life, irreversible capacity loss, easy to form SEI film and other problems of electrode materials, so as to increase the rate of insertion and extraction and slow down the volume Expansion effect, effect of increasing specific capacity

Active Publication Date: 2020-03-06
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the anode materials commonly used in the market for lithium-ion batteries are mainly carbon materials, including natural graphite, synthetic graphite, carbon fiber, mesophase small spherical carbon, etc.; the theoretical specific capacity of carbon is 372mAh g -1 , carbon materials are widely used as anode materials for commercial lithium-ion batteries due to their low price and abundant resources. However, graphite anode batteries will suffer structural damage during the cycle, easily form SEI films, and cause irreversible lithium ion batteries. Capacity loss, it is difficult to meet the requirements of high rate and long life of electrode materials

Method used

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  • Preparation method of carbon-coated Co and Ni composite oxide nano-particles
  • Preparation method of carbon-coated Co and Ni composite oxide nano-particles
  • Preparation method of carbon-coated Co and Ni composite oxide nano-particles

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Weigh 1.0mmoL (0.249g) cobalt acetate tetrahydrate (C 4 h 6 CoO 44H 2 O) and 1.0mmoL (0.248g) nickel acetate tetrahydrate (C 4 h 6 NiO 4 4H 2 (2), be dissolved in 5.0mL of DMF and 5.0mL of absolute ethanol, stir for 30min, add 1.5g of PVP (K-13 polyvinylpyrrolidone) and continue to stir for 2h, adjust the pH value of the mixed solution with glacial acetic acid to be 4.5, to obtain Clear and transparent spinning precursor mixed solution; inject the above-mentioned clear and transparent spinning precursor mixed solution into a 10mL syringe. -1 , temperature is 35 ℃, humidity is 30% under the condition of carrying out electrospinning, obtains spinning product; Place above-mentioned electrospinning product in the crucible of muffle furnace, under air atmosphere, take 180min to heat up to 200 ℃ and Sintered for 3h, followed by N 2 It took 120 minutes to heat up to 500°C and sintered for 2 hours in the atmosphere, and then naturally cooled to room temperature to obtai...

Embodiment 2

[0031] Weigh 1.0mmoL (0.249g) cobalt acetate tetrahydrate (C 4 h 6 CoO 4 4H 2 O) and 1.0mmoL (0.248g) nickel acetate tetrahydrate (C 4 h 6 NiO 4 4H 2 (2), be dissolved in 5.0mL of DMF and 5.0mL of absolute ethanol, stir for 30min, add 1.5g of PVP (K-13 polyvinylpyrrolidone) and continue to stir for 2h, adjust the pH value of the mixed solution with glacial acetic acid to be 6.5, to obtain Clear and transparent spinning precursor mixed solution; inject the above-mentioned clear and transparent spinning precursor mixed solution into a 10mL syringe. -1 , temperature is 35 ℃, humidity is 30% under the condition of carrying out electrospinning, obtains spinning product; Place above-mentioned electrospinning product in the crucible of muffle furnace, under air atmosphere, use 180min to heat up to 300 ℃ and Sintered for 3h, followed by N 2 It took 120 minutes to heat up to 600°C and sintered for 2 hours in the atmosphere, and then naturally cooled to room temperature to obtai...

Embodiment 3

[0033] Weigh 1.0mmoL (0.249g) cobalt acetate tetrahydrate (C 4 h 6 CoO 4 4H 2 O) and 1.0mmoL (0.248g) nickel acetate tetrahydrate (C 4 h 6 NiO 4 4H 2 (2), be dissolved in 5.0mL of DMF and 5.0mL of absolute ethanol, stir for 30min, add 1.5g of PVP (K-13 polyvinylpyrrolidone) and continue to stir for 2h, adjust the pH of the mixed solution with glacial acetic acid to be 5.5, to obtain Clear and transparent spinning precursor mixed solution; inject the above-mentioned clear and transparent spinning precursor mixed solution into a 10mL syringe. -1 , temperature is 35 ℃, humidity is 30% under the condition of carrying out electrospinning, obtains spinning product; Place above-mentioned electrospinning product in the crucible of muffle furnace, under air atmosphere, use 180min to heat up to 250 ℃ and Sintered for 3h, followed by N 2 It took 120 minutes to heat up to 550°C and sintered for 2 hours in the atmosphere, and then naturally cooled to room temperature to obtain the ...

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Abstract

The invention discloses a preparation method of carbon-coated Co and Ni composite oxide nano-particles. The preparation method comprises the steps: taking cobalt acetate tetrahydrate and nickel acetate tetrahydrate as main raw materials; adding a proper amount of polymer PVP as a binder, preparing an electrostatic spinning product under a high-pressure condition by utilizing an electrostatic spinning technology, and sintering in a muffle furnace in a program temperature control manner to obtain the carbon-coated Co and Ni composite oxide nano-particles which have good electrochemical properties when being used as a negative electrode material of a lithium ion battery. The nano-particles are used as a catalyst and have good catalytic performance. In the whole preparation process, the operation is easy, the cost is low, the equipment investment is small, scientific development concept and sustainable development requirements of the green and environment-friendly development concept are met, and the preparation method is suitable for batch production.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a preparation method of carbon-coated Co and Ni composite oxide nanoparticles. Background technique [0002] After decades of rapid development of human society, energy shortage and environmental pollution have become two major problems in the world today. Countries around the world have begun to realize the seriousness and urgency of the problems, and have put the resolution of these two problems on the agenda. At present The main way to solve these problems is to increase the development and utilization of clean and renewable energy, replace the use of fossil fuels with renewable clean energy, and reduce the dependence on fossil fuels. Clean and renewable energy includes solar energy, wind energy, geothermal energy, Tidal energy, nuclear energy, etc., their advantages are inexhaustible and non-polluting to the environment, but their disadvantages are that they are ...

Claims

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Application Information

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IPC IPC(8): C01G53/04C01G53/00C01G51/04C01B32/05H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCC01G53/04C01G51/04C01G53/00C01B32/05H01M4/525H01M4/625H01M10/0525B82Y30/00C01P2004/80C01P2004/64C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 李星刘语舟
Owner NINGBO UNIV