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CoO/rGO composite and preparation method and use thereof

A composite and purpose technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of limiting the practical application of lithium-air batteries, large difference in charge and discharge voltage, and short cycle life, and achieve green environmental protection. The effect of small overpotential and high specific capacity

Active Publication Date: 2018-09-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxygen reduction (ORR, 2Li + +2O 2 → Li 2 o 2 ) reaction and oxygen evolution (OER, Li 2 o 2 →O 2 +2Li + ) reaction, lithium-air batteries also face problems such as low Coulombic efficiency, poor rate performance, short cycle life, and large charge-discharge voltage difference, which limit the practical application of lithium-air batteries.

Method used

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  • CoO/rGO composite and preparation method and use thereof
  • CoO/rGO composite and preparation method and use thereof
  • CoO/rGO composite and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) To prepare graphite oxide solution, dissolve 40mg of graphite oxide in 40ml of water, and sonicate in a cell pulverizer for 30min to obtain a uniform suspension.

[0042] (2) Add cobalt nitrate and urea at a molar ratio of 1:1 to the suspension, and stir at room temperature for 30 min.

[0043] (3) Transfer the homogeneous suspension (2) to a reaction kettle and heat at 120°C for 12 hours to obtain a precipitate.

[0044] (4) Wash the obtained precipitate three times with water and ethanol respectively, dry in an oven at 60°C to obtain a dry solid, and then grind the solid into a powder in a mortar.

[0045] (5) The powder obtained in step (4) was calcined at 500°C for 4 hours under the protection of Ar atmosphere to obtain a CoO / rGO composite.

[0046] Such as figure 1 Shown is the XRD pattern of the CoO / rGO composite. The diffraction peaks are consistent with the standard peaks of cobalt oxide (JCPDS Card No. 48-1719), and there are no impurity peaks, indicating...

Embodiment 2

[0048] The CoO / rGO composite prepared in Example 1, PVDF and SP were mixed according to a mass ratio of 7:2:1 and ground in a mortar for half an hour to make them completely mixed. Then put the uniformly mixed solid powder into a small beaker, drop a few drops of N-methyl-2-pyrrolidone (NMP) and ultrasonicate for half an hour, so that the sample is evenly dissolved in the reagent. Finally, the dissolved product was evenly coated on carbon paper with a diameter of 1.2 cm, and dried in a vacuum oven at 120° C. for 12 hours to obtain a porous electrode containing the catalyst.

Embodiment 3

[0050] The catalyst-containing porous electrode prepared in Example 2, lithium sheet, PTFE separator, and electrolyte (1.0 M LiTFSI / TEGDME) were assembled into an air battery in an argon-filled glove box.

[0051] Lithium-air battery assembly sequence is from bottom to top, first place the negative electrode (lithium sheet) in the center of the mold base, drop two drops of electrolyte, then put a layer of PTFE diaphragm, then drop two drops of electrolyte on the diaphragm, and then put the positive electrode The sheet is placed on the separator (the side coated with the positive electrode material is placed facing the separator), and finally the mold is screwed tightly, placed in an oxygen-filled environment, and the electrochemical test is performed after standing for 5 hours.

[0052] Such as Figure 4 As shown, the composite catalyst was applied to Li-air batteries, at 100 mA g -1 The charge and discharge test was carried out under the current density, and the discharge ca...

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Abstract

The invention discloses a CoO / rGO composite and a preparation method and application thereof, the CoO / rGO composite is formed by randomly distributing CoO nanorods in the shape of sugar coated haws ona stick on the surface of graphene, the CoO nanorods are composed of CoO nanoparticles, and a gap is arranged between adjacent CoO nanoparticles. The CoO / rGO composite is a double-effect catalyst fora lithium air battery. The CoO / rGO composite has good catalytic activity for both ORR and OER, and has very high battery capacity. The CoO / rGO composite has simple process, environmental friendliness, low cost and high efficiency and other characteristics.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a CoO / rGO composite and its preparation method and application. Background technique [0002] In recent years, with the rapid development of electronic products and power vehicles, traditional lithium-ion batteries can no longer meet the market's requirements for energy density. At the same time, with the development of society, human beings are facing severe environmental problems and resource crises. Lithium-air batteries are mainly composed of lithium sheets as negative electrodes, oxygen as positive electrodes, and non-aqueous organic electrolytes. Since the reactant of the positive electrode in the lithium-air battery is oxygen in the air, it is inexhaustible; in addition, the air as the reactant can greatly reduce the quality of the lithium-air battery, thereby reducing the application capacity. The quality of electric vehicles with lithium-air batteries can e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 宋仲海陈萌汪杰
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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