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Graphene-coated copper oxide composite cathode material and method for manufacturing same

A graphene-coated, negative electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of reduced capacity, poor conductivity of copper oxide electrodes, etc., achieve improved electrochemical performance, simple synthesis method, and accelerate the development of electrons The effect of migration

Active Publication Date: 2013-02-06
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention proposes a graphene-coated copper oxide composite negative electrode material and a preparation method thereof, which has a simple synthesis method, and the prepared graphene-coated copper oxide composite negative electrode material has good performance, and solves the problem of copper oxide electrode Poor electrical conductivity and gradual pulverization during charging and discharging lead to technical problems of reduced capacity

Method used

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  • Graphene-coated copper oxide composite cathode material and method for manufacturing same
  • Graphene-coated copper oxide composite cathode material and method for manufacturing same

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Weigh 1.7g of CuCl 2 2H 2 O is dissolved in deionized water to form a copper chloride solution with a concentration of 0.1mol / L, and 100ml of a graphene oxide solution with a concentration of 0.17mol / L (the concentration of the graphene oxide solution is calibrated in advance, and the graphene quality in the solution is about Half of the mass of graphene oxide) mixed evenly and stirred for 30 minutes, kept in a constant temperature water bath, set the temperature at 50°C, added dropwise 120ml of sodium hydroxide solution with a concentration of 0.2mol / L and continued to stir at a constant temperature for 1h; after standing for 8h, centrifuged, and then microwaved Auxiliary hydrothermal, the hydrothermal temperature is 180°C, and the hydrothermal time is 1h; finally, it is dried at 120°C for 12h to obtain the graphene-coated copper oxide composite negative electrode material.

[0019] The mass percentage content of copper oxide in the graphene-coated copper oxide compos...

Embodiment 2

[0021] Weigh 2.7g of Cu(NO 3 ) 2 ·3H 2 O was dissolved in deionized water to prepare a copper nitrate solution with a concentration of 0.113mol / L, mixed with 100ml of a graphene oxide solution with a concentration of 0.083mol / L and stirred for 15min. 140ml of sodium hydroxide solution with a concentration of 0.2mol / L was continuously stirred at a constant temperature for 2 hours; centrifuged after standing for 4 hours, and then microwave-assisted hydroheating was used, the hydrothermal temperature was 160°C, and the hydrothermal time was 30 minutes; finally, it was dried at 120°C for 12 hours to obtain Graphene-coated copper oxide composite anode material.

[0022] The mass percentage content of copper oxide in the graphene-coated copper oxide composite negative electrode material obtained in this embodiment is 90%, and the mass percentage content of graphene is 10%.

Embodiment 3

[0024] Weigh 1.9g of Cu(SO 4 ) 2 ·5H 2 O was dissolved in deionized water to make a copper sulfate solution with a concentration of 0.075mol / L, mixed with 100ml of a graphene oxide solution with a concentration of 0.333mol / L and stirred for 1 hour, kept in a constant temperature water bath, and the temperature was set at 60°C, and added dropwise 90 ml of potassium hydroxide solution with a concentration of 0.2 mol / L was continuously stirred at a constant temperature for 1.5 h; after standing for 12 h, it was centrifuged, and then microwave-assisted hydroheating was used. The hydrothermal temperature was 200 °C and the hydrothermal time was 2 hours. Finally, it was dried at 120° C. for 12 hours to obtain a graphene-coated copper oxide composite negative electrode material.

[0025] The mass percent content of copper oxide in the graphene-coated copper oxide composite negative electrode material obtained in this embodiment is 60%, and the mass percent content of graphene is 40...

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Abstract

The invention discloses a graphene-coated copper oxide composite cathode material and a method for manufacturing the same. The graphene-coated copper oxide composite cathode material comprises, by mass, from 20% to 90% of copper oxide and from 10% to 80% of graphene. The method includes uniformly mixing copper salt solution and graphene oxide solution at first, and stirring the copper salt solution and the graphene oxide solution at a constant temperature for 15 minutes to 1 hour to obtain mixed solution; dripping sodium hydroxide solution into the mixed solution, continuously stirring the mixed solution added with the sodium hydroxide solution for 0.5 hour to 2 hours and allowing the mixed solution added with the sodium hydroxide solution to stand for 2 to 24 hours; and performing centrifuging and hydrothermal processing for the mixed solution added with the sodium hydroxide solution to obtain a product, and drying the product at the temperature of 120 DEG C for 12 hours to obtain the graphene-coated copper oxide composite cathode material. The graphene-coated copper oxide composite cathode material and the method have the advantages that the synthesis method is simple, the manufactured graphene-coated copper oxide composite cathode material is good in performance, and technical problems of poor conductivity of a copper oxide electrode and decrease of capacity due to gradual chalking in charge and discharge processes are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a graphene-coated copper oxide composite negative electrode material and a preparation method thereof. Background technique [0002] With the rapid development of the miniaturization and miniaturization of today's electronic equipment, the research and application of lithium-ion batteries are getting more and more attention. Lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras, portable small electrical appliances and submarines, aerospace, and aviation fields, and are gradually moving towards electric vehicles and other power fields. However, the current commercialized graphite anodes have limited performance, especially low specific capacity. To realize the real large-scale application of lithium-ion batteries in the field of electric vehicles, the energy density, high-current charge-discharge perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48
CPCY02E60/12Y02E60/10
Inventor 黄正宏丁翔沈万慈康飞宇
Owner TSINGHUA UNIV
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