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Three-dimensional graphene-coated metal-organic framework (MOF) composite electrode material and preparation method thereof

A technology of graphene coating and electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of insufficient capacity, poor cycle stability, battery development, etc., and achieve improved utilization, superior electrochemical performance, Good electrical conductivity and the effect of encapsulation

Active Publication Date: 2017-09-22
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, commercial lithium-ion batteries mostly use lithium-containing transition metal oxides as the positive electrode for lithium storage, and graphite as the negative electrode, but the capacity is not high enough to meet the needs of people's daily life, and problems such as poor cycle stability restrict the development of batteries.

Method used

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  • Three-dimensional graphene-coated metal-organic framework (MOF) composite electrode material and preparation method thereof
  • Three-dimensional graphene-coated metal-organic framework (MOF) composite electrode material and preparation method thereof
  • Three-dimensional graphene-coated metal-organic framework (MOF) composite electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of graphene oxide:

[0028] Graphene oxide was prepared by the improved hummers method, specifically: take 0.5-5 g of 325 mesh-8000 mesh flake graphite powder, add 0.2-2.5 g of sodium nitrate powder, and then add 10-120 ml of concentrated sulfuric acid, concentrated phosphoric acid, and concentrated nitric acid One or more of them, stir for 5~30 min, slowly add 2~20 g of potassium permanganate, potassium perchlorate, and potassium carbonate in an ice-water bath. Stir in a water bath for 0.5~3 h, then add a small amount of water, continue the reaction for 10~30min, then add a large amount of water above 100 ml, react for 5~20min, and then add an appropriate amount of hydrogen peroxide until the solution turns golden yellow;

[0029] After the solution was allowed to settle, the supernatant was removed by decantation, an appropriate amount of 5% to 10% hydrochloric acid was added, and the solution was divided into centrifuge tubes for high-speed centrifuga...

Embodiment 2

[0035] The 2 mg / mL GO aqueous solution was obtained by the method in the above Example 1, 0.02 mL of 0.5 mol / L potassium ferrocyanide solution was added to the 2 mg GO aqueous solution under stirring, and 0.2 mL of 0.5 mol GO was added after shaking well. / L ferric chloride solution, then add an appropriate amount of 1 M sodium ascorbate aqueous solution, mix evenly, and heat in an oven at 90-100 °C for 1-2 h to obtain a hydrogel of Prussian blue supported on graphene (3DG / PB), washed with water After 3 to 5 times, it was placed in the refrigerator for 1 to 3 hours, and then lyophilized for 16 to 24 hours to obtain a self-supporting 3DG / PB aerogel ( figure 1 ). The obtained composite gel was used as a cathode material for sodium-ion batteries, and the capacity after 1000 cycles at a current density of 1 A / g remained at 85 mAh / g ( image 3 ).

Embodiment 3

[0037] The 2 mg / mL GO aqueous solution was obtained by the method in the above Example 1, and 0.02 mL of 0.5 mol / L sodium ferrocyanide solution was added to the 2 mg GO aqueous solution under stirring, and 0.2 mL of 0.5 mol GO was added after shaking well. / L nickel chloride solution, then add an appropriate amount of 1 M sodium ascorbate aqueous solution, mix well and heat in an oven at 90-100 °C for 1-2 h to obtain a hydrogel of nickel ferricyanide supported on graphene (3DG / PBA) , washed with water for 3 to 5 times, placed in the refrigerator for 1 to 3 hours, and then lyophilized for 16 to 24 hours to obtain self-supporting 3DG / PBA aerogels. The obtained composite gel was used as a cathode material for sodium-ion batteries, and the capacity after 1000 cycles at a current density of 0.5 A / g remained at 50 mAh / g.

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Abstract

The invention belongs to the technical field of a battery material, and particularly discloses a three-dimensional graphene-coated metal-organic framework MOF composite electrode material and a preparation method thereof. In order to solve the problems of relatively large volume expansion, limited ion transmission, poor conductivity and the like of an MOF and a derivative thereof during the circulation process, the MOF material is wrapped in three-dimensional graphene by employing an Ostwald curing theory to form three-dimensional graphene-coated MOF aerogel, three-dimensional graphene-coated MOF derivative gel is synthesized by thermal conversion, and the aerogel is compacted to form a flexible thin film and is directly used as a battery electrode material. The preparation method is simple, the raw material resource is rich, the MOF composite electrode material is low in cost, the electrode is high in specific capacity, high in rapid charge-discharge capacity and long in cycle lifetime, and a high-performance flexible electronic device is expected to be produced on a large scale.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and particularly relates to positive and negative electrode materials for lithium and sodium ion batteries and a preparation method thereof. Background technique [0002] At present, commercial lithium-ion batteries mostly use lithium-containing transition metal oxides as lithium storage cathodes and graphite as anodes, but the capacity is not high enough to meet the needs of people's daily life, and the development of batteries is restricted by problems such as poor cycle stability. . Metal-organic frameworks (MOFs) are zeolite-like materials with repeating network structures formed by self-assembly of organic ligands and metal ions. new material. Compared with traditional inorganic porous materials, MOFs have larger porosity and specific surface area, especially tunable pore size and variable functional groups. At present, MOFs have been used in hydrogen storage, drug delivery, cat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M10/0525H01M10/054
CPCH01M4/362H01M4/60H01M4/62H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 徐宇曦姜天才卜凡兴刘白浪冯晓祥
Owner FUDAN UNIV
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