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Preparation method of ultra-high density cobaltosic oxide/porous graphene nano-composite anode material for lithium ion battery

A technology of porous graphene and cobalt tetroxide, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., to achieve excellent electrochemical performance, overcome poor electronic conductivity, and enhance electronic conductivity.

Inactive Publication Date: 2015-09-23
SUZHOU GREEN POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can not only significantly improve the adverse effects such as the decrease of the first Coulombic efficiency and the tilt of the charging / discharging platform caused by adding too much graphene.

Method used

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  • Preparation method of ultra-high density cobaltosic oxide/porous graphene nano-composite anode material for lithium ion battery
  • Preparation method of ultra-high density cobaltosic oxide/porous graphene nano-composite anode material for lithium ion battery
  • Preparation method of ultra-high density cobaltosic oxide/porous graphene nano-composite anode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) First, graphene oxide is prepared by a conventional chemical method (Hummers method) for preparing graphene oxide. (2) Weigh a certain mass (1 g) of the prepared graphene oxide, dissolve it in 100 mL of water for three times, and disperse until uniform by ultrasonic, then add 1000 mL of concentrated nitric acid solution, and use high-power ultrasonic for 4 hours. After centrifugation, the obtained solid product is taken out and dried at 60°C to obtain graphene with uniform nanoporous defects on the surface;

[0036] (3) Select the appropriate CoCl 2 , mixed with urea, porous graphene, and water ultrasonically in a certain proportion, transferred to a hydrothermal kettle, hydrothermally reacted at 55°C for 8 hours, centrifuged to take out the solid product, washed several times with water, and dried at 60°C;

[0037] (4) The above solid product was heated at 250°C in air for 6 hours, and finally reduced in a tube furnace at 400°C for 2 hours under inert gas conditio...

Embodiment 2

[0039] (1) Firstly, graphene oxide is prepared by a conventional chemical method (Hummers method) for preparing graphene oxide;

[0040] (2) Weigh a certain mass (5 g) of the prepared graphene oxide, dissolve it in 500 mL of water for three times, and disperse it uniformly by ultrasonication, then add 4000 mL of potassium dichromate solution, and use high-power ultrasonication for 10 hours. After centrifugation, the obtained solid product is taken out and dried at 60°C to obtain graphene with uniform nanoporous defects on the surface;

[0041] (3) Choose the right CoSO 4 , mixed with urea, porous graphene, and water ultrasonically in a certain proportion, transferred to a hydrothermal kettle, hydrothermally reacted at 75°C for 10 hours, centrifuged to take out the solid product, washed several times with water, and dried at 60°C;

[0042] (4) The above solid product was heated at 300°C in air for 10 hours, and finally reduced in a tube furnace at 600°C for 4 hours under inert...

Embodiment 3

[0044] (1) Firstly, graphene oxide is prepared by a conventional chemical method (Hummers method) for preparing graphene oxide;

[0045] (2) Weigh a certain mass (50g) of the prepared graphene oxide, dissolve it in 1000 mL of water for three times, and disperse until uniform by ultrasonic, then add 5000 mL of perchloric acid solution, and perform high-power ultrasonication for 1 day. After centrifugation, the obtained solid product is taken out and dried at 60°C to obtain graphene with uniform nanoporous defects on the surface;

[0046] (3) Select the appropriate cobalt nitrate, mix it with urea, porous graphene, and water in a certain proportion, transfer it to a hydrothermal kettle, and conduct a hydrothermal reaction at 80°C for 12 hours, centrifuge to take out the solid product, and wash it several times with water for 60 ℃ drying;

[0047] (4) The above solid product was heated at 350°C in air for 8 hours, and finally reduced in a tube furnace at 500°C for 3 hours under ...

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Abstract

The invention relates to a preparation method of an ultra-high density cobaltosic oxide / porous graphene nano-composite anode material for a lithium ion battery and brings forward a novel low-cost in-situ growth method. According to the method, evenly distributed in plane defect sites are manufactured on the surface of oxidized graphene by means of strong oxidization of a chemical reagent; and then through a low-temperature hydrothermal reaction, in-situ growth of ultra-high density cobaltosic oxide nano-particles happens on porous graphene with the defect active sites. Cobaltosic oxide accounts for more than 92% of the compound, and adverse effects such as the drop in first coulombic efficiency and tilt of a charging / discharging platform due to addition of overmuch graphene can remarkably be improved. In the cobaltosic oxide / porous graphene nano-composite material, graphene can effectively improve conductivity insufficiency of cobaltosic oxide; and volume effect of cobaltosic oxide during the cyclic process can be well overcome due to the particle size of 5-10 nm. Thus, the material has ultra-high electrochemical performance. According to the invention, the principle is simple, and the material is easy to produce.

Description

technical field [0001] The invention belongs to the field of new energy materials and energy electrochemistry research, and specifically relates to a new preparation method of an ultra-high-density cobalt tetroxide / porous graphene nanocomposite negative electrode material for lithium ion batteries. Background technique [0002] Due to the advantages of high energy density, lithium-ion batteries have been developed rapidly in the past 20 years, and are widely used as power sources for portable electronic products such as mobile phones, cameras, and notebook computers. In recent years, the development of hybrid electric vehicles, plug-in hybrid electric vehicles and large-scale energy storage equipment has put forward higher requirements for the next-generation lithium-ion batteries in terms of energy density, rate performance and cycle life. At present, the theoretical capacity of common graphite anode materials is only 372 mAh g -1 , so improving the capacity of anode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 王海波吴曲勇
Owner SUZHOU GREEN POWER TECH CO LTD
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