Graphene oxide/metal organic framework composite material and preparation method and application thereof

A metal-organic framework and composite material technology, which is applied in the field of graphene oxide/metal-organic framework composite material and its preparation, can solve the problems of low specific capacity and unreachable capacity, improve electrochemical performance, and improve charge-discharge cycle life. , the effect of good cycle stability

Inactive Publication Date: 2017-07-07
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

But MIL-101(Cr) / GO at 50 mA g -1 Under the current density, the second discharge specific capacity is only 107.2 mAhg -1 , the specific capacity is low, still not meeting the needs of practical applications [Inorg. Chem. Commun, 2016, 64: 63-66]

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  • Graphene oxide/metal organic framework composite material and preparation method and application thereof
  • Graphene oxide/metal organic framework composite material and preparation method and application thereof
  • Graphene oxide/metal organic framework composite material and preparation method and application thereof

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Embodiment

[0032] The preparation method of the graphene oxide / metal organic framework composite material MOF-74-THF-5GO containing 5% graphene oxide, the specific operation steps are as follows:

[0033] In step (1), weigh 12.454 mg of graphene oxide and add it to a mixed solution of tetrahydrofuran and deionized water (1:1 volume ratio, 20 mL in total), and oscillate ultrasonically for 30 min to form a uniformly dispersed graphene oxide solution;

[0034] Step (2), weigh 0.24908 g (0.001 mol) of cobalt acetate tetrahydrate and 0.19813 g (0.001 mol) of 2,5-dihydroxyterephthalic acid into 10 mL of deionized water, and ultrasonically vibrate to form a mixture liquid;

[0035] Step (3), mix 10 mL of the mixed solution obtained in step (3) with 20 mL of the graphene oxide solution obtained in step (2), and ultrasonically oscillate for 10 min. After mixing evenly, put it into the reaction kettle. The quality of graphene is 5% of the quality of cobalt acetate tetrahydrate;

[0036] Step (4)...

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Abstract

The invention provides a graphene oxide/metal organic framework composite material. The composite material is prepared from graphene oxide, cobalt acetate tetrahydrate and 2, 5-dihydroxyterephthalic acid which are mixed based on a certain proportion through a solvothermal method. The preparation method comprises the steps of (1) dispersing graphene oxide into a solvent to obtain a graphene oxide solution; (2) adding the cobalt acetate tetrahydrate and 2, 5-dihydroxyterephthalic acid into deionized water to form a mixed solution; (3) enabling the obtained mixed solution to be mixed with the obtained graphene oxide solution, and then putting the mixture into a reaction kettle; and (4) performing constant-temperature heating in a drying oven, taking out the product, washing and drying. According to the application of the composite material as a negative electrode material of a lithium ion battery, the specific capacity value can reach 520-600mAh g<-1> at current density of 100mAg<-1> in an electrochemical performance test. The composite material is high in cycling stability, long in charging-discharging service life, and has wide application prospect in the field of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of inorganic material preparation technology, in particular to a graphene oxide / metal organic framework composite material and its preparation method and application. Background technique [0002] Lithium-ion battery is a new type of energy storage battery, which has obvious advantages such as large specific capacity, long cycle life, high working voltage, wide working temperature range, little environmental pollution, no pollution, and low self-discharge rate. Lithium-ion batteries are more and more widely used in daily life and production, and are mostly used in digital products such as mobile phones, cameras, and laptop computers, as well as in fields such as electric vehicles, aerospace, and aviation. At present, in lithium-ion batteries, the commercial negative electrode material is graphite. [0003] Metal-organic frameworks (Metal-Organic Frameworks, MOFs) are materials with periodic network structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62
CPCH01M4/364H01M4/48H01M4/62H01M4/624Y02E60/10
Inventor 孙立贤罗玉梅徐芬
Owner GUILIN UNIV OF ELECTRONIC TECH
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