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Preparation method and application of a composite reduced graphene oxide Prussian blue material

A technology of Prussian blue and graphene, applied in the field of preparation of Prussian blue materials, can solve the problems of low specific capacity, high method cost, complicated operation, etc.

Inactive Publication Date: 2020-10-23
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the above-mentioned problems of the prior art, the invention provides a kind of preparation method of the Prussian blue material of composite reduced graphene oxide, the Prussian blue material of a kind of composite reduced graphene oxide prepared by this method overcomes existing Prussian blue material in When used as a cathode material for sodium-ion batteries, there are defects such as poor rate performance, low specific capacity, high method cost, and complicated operation.

Method used

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  • Preparation method and application of a composite reduced graphene oxide Prussian blue material
  • Preparation method and application of a composite reduced graphene oxide Prussian blue material

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Embodiment 1

[0048] The preparation method of the Prussian blue material of composite reduced graphene oxide adopts the following steps:

[0049] 1) Prepare 200ml of Na with a concentration of 10mM 4 Fe(CN) 6 Solution A, transfer it to a beaker with a magnet, and stir with a magnetic stirrer at a low speed of 300rpm. 2) Using commercially available graphene oxide GO, according to relative Na 4 Fe(CN) 6 The mass ratio of 2% was weighed and added to solution A, ultrasonicated for 10 minutes to make it uniformly dispersed to obtain solution B.

[0050] 3) Add ascorbic acid and 1 mM sodium citrate to the solution B so that the final concentration is 1 mM, and stir for 5 min to obtain a mixed solution C.

[0051] 4) Use a pH tester to measure the pH value of solution C in real time, and add hydrochloric acid dropwise to pH = 1 to obtain solution D.

[0052] 5) Transfer the above solution D to a flask and fix it in a water bath, pass an inert gas such as nitrogen, and place it in the dark, ...

Embodiment 2

[0061] The preparation method of the Prussian blue material of composite reduced graphene oxide comprises the steps:

[0062] 1) Prepare 200ml of Na with a concentration of 20mM 4 Fe(CN) 6 Solution A, transfer it to a beaker with a magnet, and stir with a magnetic stirrer at a low speed.

[0063] 2) Pre-prepared graphene oxide GO by Hummers method, according to relative Na 4 Fe(CN) 6 The mass ratio of 5% was weighed and added to solution A, and it was ultrasonically dispersed for 15 minutes to obtain solution B evenly.

[0064] 3) Add ascorbic acid and sodium citrate to solution B to make the final concentration of each 2.5mM, stir for 8min to obtain mixed solution C.

[0065] 4) Use a pH tester to test the pH value of solution C in real time, add hydrochloric acid dropwise to pH = 1.2, and obtain solution D.

[0066] 5) Transfer the above solution D to a flask and fix it in a water bath, pass an inert gas such as nitrogen or hydrogen-argon mixed gas, keep it away from li...

Embodiment 3

[0072] The preparation method of the Prussian blue material of composite reduced graphene oxide comprises the steps:

[0073] 1) Prepare 200ml of Na with a concentration of 30mM 4 Fe(CN) 6 Solution A, transfer it to a beaker with a magnet, and stir with a magnetic stirrer at a low speed.

[0074] 2) Pre-prepared graphene oxide GO by Hummers method, according to relative Na 4 Fe(CN) 6 The mass ratio of 10% was weighed and added to solution A, ultrasonicated for 30 minutes to make it uniformly dispersed to obtain solution B.

[0075] 3) Add ascorbic acid and 5 mM sodium citrate to solution B with a final concentration of 5 mM, and stir for 10 min to obtain mixed solution C.

[0076] 4) Use a pH tester to test the pH value of solution C in real time, and add hydrochloric acid dropwise to pH=2 to obtain solution D.

[0077] 5) Transfer the above solution D to a flask and fix it in a water bath, pass through an inert gas such as nitrogen or hydrogen-argon gas mixture, keep it ...

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Abstract

The invention relates to a method for preparing a prussian blue material through reduction of graphene oxide, and application. The preparation method comprises the steps of ultrasonically dispersing the graphene oxide into a sodium ferrocyanide water solution, adding ascorbic acid for resisting oxidation, adding sodium citrate for reducing a reaction rate, dropwise adding hydrochloric acid for adjusting the solution to be acidic, heating and stirring for reacting under the inert gas protection to obtain a material, washing, vacuum drying, and carrying out microwave irradiation for reducing thegraphene oxide to obtain the product. When the prussian blue material prepared through composite reduction of the graphene oxide provided by the invention is used as a sodium-ion battery anode, the specific capacity, the cycle performance and the rate capability of a battery are greatly improved, the charge and discharge specific capacity of the battery in an organic system reaches up to not lessthan 153mAh.g<-1>, and the specific capacity of the battery in a water system single platform reaches up to not less than 81mAh.g<-1>; the preparation method is low in cost, fast, simple, and favorable in application prospect.

Description

technical field [0001] The technical field of battery preparation of the present invention particularly relates to a preparation method and application of a composite reduced graphene oxide Prussian blue material. Background technique [0002] At present, the problems exposed in the industrial feasibility of electrolyte, diaphragm and negative electrode materials of sodium ion batteries have been gradually improved, showing excellent performance, and the research progress of the positive electrode material system of sodium ion batteries has become a key factor determining the performance of battery systems. As the main part of battery sodium storage, the cost of cathode material accounts for about 28% of the total cost, which is closely related to the development cost, battery capacity, safety performance, service life and commercial application of the battery. In recent years, researchers in this field have developed a variety of valuable cathode material systems, and the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/054C01B32/184C01G49/00
CPCC01G49/009C01P2004/03C01P2004/62C01P2006/40H01M4/58H01M10/054Y02E60/10
Inventor 武俊伟靳晓诚崔彦辉唐启明
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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