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Preparation method of graphene oxide and graphene oxide composite material and use of graphene oxide and graphene oxide composite material in sodium-ion battery

A composite material and graphene technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability and failure to meet the needs of practical applications, and achieve high specific capacity, low production cost, and cycle stability Good results

Inactive Publication Date: 2015-01-07
ZHEJIANG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle stability is still poor and cannot meet the needs of practical applications

Method used

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  • Preparation method of graphene oxide and graphene oxide composite material and use of graphene oxide and graphene oxide composite material in sodium-ion battery
  • Preparation method of graphene oxide and graphene oxide composite material and use of graphene oxide and graphene oxide composite material in sodium-ion battery
  • Preparation method of graphene oxide and graphene oxide composite material and use of graphene oxide and graphene oxide composite material in sodium-ion battery

Examples

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preparation example Construction

[0020] A preparation method of graphene oxide composite material comprises electrostatic spray deposition method, precipitation method, chemical vapor deposition method or hydrothermal method,

[0021] The electrostatic spray deposition method is as follows: metal salt and graphene oxide are mixed according to the required composition of the film, that is, metal salt: graphene oxide = (25-95) wt%: (75-5) wt%, metal salt The mixture solution with graphene oxide is dissolved in one or more of ethanol, ethylene glycol, and 1,2-propanediol solvents to form a precursor solution with a concentration of 0.001-0.2 mol / L, which is mixed uniformly and flows to the spray needle at a uniform speed , under the action of an electrostatic field of 5-20 kV, the precursor solution forms a stable and uniform aerosol spray, which is deposited on a substrate with a heating temperature of 100-300 ℃ to form a thin film, and the obtained thin film is heated under a protective atmosphere. Obtain grap...

Embodiment 1

[0037] The method for preparing graphene oxide sodium ion battery negative electrode material in the present embodiment comprises the following steps:

[0038] putting graphite oxide into water and ultrasonically obtaining a graphite oxide suspension with a concentration of 1 mg / ml, obtaining a graphene oxide suspension after ultrasonication, filtering and drying after ultrasonication, and obtaining a graphene oxide material;

[0039] The above-mentioned graphene oxide powder, that is, the negative electrode material of the sodium ion battery, is prepared into a sodium ion battery. First, mix graphene oxide, polyvinylidene fluoride binder, and conductive agent acetylene black according to the mass ratio of 8:1:1, add an appropriate amount of NMP (N-methylpyrrolidone) solution for ultrasonic dispersion, and stir evenly After forming a slurry coated on the copper foil, dried and cut into =15mm electrode piece, dried at 120 ℃ for 10 hours under vacuum condition, and randomly tr...

Embodiment 2

[0041] In this embodiment, the graphene oxide / tin dioxide composite material is prepared by electrostatic spraying method, and the specific steps are:

[0042] (1) Mix stannous nitrate and graphene oxide at 86 wt%:14 wt%, dissolve in a mixed solvent of ethanol / ethylene glycol / 1,2-propanediol (2:1:2 by volume) to form A precursor solution with a metal cation concentration of 0.005 mol / L.

[0043] (2) Flow the precursor solution to the spray needle through the peristaltic pump at a constant speed of 3ml / h, adjust the distance from the spray needle to the stainless steel substrate to 4cm, and control the heating table through thermocouple feedback to keep the substrate temperature at 175°C. The generator adjusts the DC voltage clamped between the spray needle and the substrate at 15 kV to obtain a stable and uniform spray, and controls the spray time to 3 hours to obtain a graphene oxide / tin dioxide thin film negative electrode.

[0044] The above-mentioned graphene oxide / tin di...

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Abstract

The invention discloses a preparation method of graphene oxide and a graphene oxide composite material and a use of the graphene oxide and the graphene oxide composite material in a sodium-ion battery. The graphene oxide and the graphene oxide composite material can be used as sodium-ion battery cathode materials. The graphene oxide composite material is prepared from the graphene oxide and metals or metal oxides by a compounding method, wherein the metals comprise Ag, Au, Cu, Fe, Sn, Si, Ni and Sb, the metal oxides comprise nickel oxide, copper oxide, tin oxide, antimony oxide, cobalt oxide, iron oxide and manganese oxide and a mass percentage of the graphene oxide is in a range of 10-80%. The graphene oxide and the graphene oxide composite material prepared by a plurality of effective processes can be used as sodium-ion battery cathode materials, have the advantages of high specific capacity and good cycling stability, have a low manufacturing cost and are suitable for sodium-ion battery large-scale exploitation and application.

Description

technical field [0001] The invention relates to a preparation method of graphene oxide and a composite material and an application in a sodium ion battery, belonging to the field of secondary batteries. Background technique [0002] In recent years, due to its advantages of light weight, high voltage, high capacity, high power, stable discharge, and environmental friendliness, lithium-ion batteries have shown broad potential in portable electronic devices, electric vehicles, space technology, and defense industries. Application prospects and potential huge economic benefits. However, limited lithium resources and rising lithium raw material prices limit the large-scale development of lithium-ion batteries. [0003] On the other hand, the reserves of sodium element are extremely abundant (the metal elements in the earth's crust rank fourth, accounting for 2.64% of the total reserves), and the price is low. It is in the same main group as lithium, with similar chemical proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/054
CPCH01M4/133H01M4/1393H01M4/364H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 姜银珠胡梅娟严密
Owner ZHEJIANG UNIV
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