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Porous nitrogen-doped carbon/Fe2O3/graphene foamed flexible composite material and preparation method and application thereof

A nitrogen-doped carbon, composite material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of unguaranteed safety performance, low electronic conductivity, poor rate performance, etc. Effects of energy density and power density, high electrical conductivity, high specific capacity

Active Publication Date: 2018-06-22
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the commercialized lithium-ion anode materials are mainly carbon materials, which have many limitations: low theoretical capacity, dendrites may be generated on the surface when the potential is close to that of metal lithium, etc., and the safety performance cannot be guaranteed.
In recent years, Fe 2 o 3 Because of its high theoretical specific capacity, rich resources, low cost, safety and non-toxicity, it is considered to be one of the anode materials for lithium-ion batteries with potential application prospects, but the capacity decay caused by the huge volume change of the material itself during the cycle and its poor rate capability accompanied by its low electronic conductivity severely hinders its practical applications

Method used

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  • Porous nitrogen-doped carbon/Fe2O3/graphene foamed flexible composite material and preparation method and application thereof
  • Porous nitrogen-doped carbon/Fe2O3/graphene foamed flexible composite material and preparation method and application thereof
  • Porous nitrogen-doped carbon/Fe2O3/graphene foamed flexible composite material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0028] A porous nitrogen-doped carbon / Fe 2 o 3 The preparation method of / graphene flexible composite material, adopts following steps:

[0029] (1) Get the melamine foam and put it into the dilute hydrochloric acid of 1mol / L and soak for 6 hours, then transfer the melamine foam to the mixed solution of absolute ethanol / acetone (1:1) and soak for 3 hours, then use the melamine foam obtained Wash with absolute ethanol and deionized water for 3-5 times, and then dry in a 60°C drying oven for 12 hours to obtain pure melamine foam.

[0030] (2) The melamine foam in step (1) was transferred to a tube furnace, and calcined in a nitrogen atmosphere at a calcining temperature of 800° C. for 3 hours to obtain a nitrogen-doped carbon foam matrix.

[0031] (3) Nano-Fe 2 o 3 , The graphene oxide solution is mixed according to a certain ratio, and stirred until uniform. Adding quality is the 10% polyvinylpyrrolidone (PVP) of mixed solution, continues to stir 4 hours, leaves standstill ...

Embodiment 2

[0038] A porous nitrogen-doped carbon / Fe 2 o 3 The preparation method of / graphene flexible composite material, adopts following steps:

[0039] (1) The melamine foam prepared in step (1) in Example 1 was transferred to a tube furnace, and calcined in a nitrogen atmosphere at a calcining temperature of 300° C. for 10 hours to obtain a nitrogen-doped carbon foam matrix.

[0040] (2) Nano-Fe 2 o 3 1. The graphene oxide solution was mixed according to a certain ratio, and stirred until uniform, adding polyvinylpyrrolidone (PVP) whose mass was 5% of the mixed solution, stirring continuously for 4 hours, and standing for 2 hours to obtain a spinning stock solution. Among them, nano-Fe 2 o 3 The mass ratio with graphene oxide is 1:1; the Fe 2 o 3 The powder is nano-level, with a particle size of 300-500 nanometers; concentrated sulfuric acid and potassium permanganate are used as oxidants to oxidize graphite powder into graphite oxide, and then use ultrasonic stripping to peel...

Embodiment 3

[0045] A porous nitrogen-doped carbon / Fe 2 o 3 The preparation method of / graphene flexible composite material, adopts following steps:

[0046] (1) The melamine foam prepared in step (1) in Example 1 was transferred to a tube furnace and calcined in a nitrogen atmosphere at a calcining temperature of 1200° C. for 1 hour to obtain a nitrogen-doped carbon foam matrix.

[0047] (2) Nano-Fe 2 o 3 , the graphene oxide solution was mixed according to a certain ratio, stirred until uniform, adding quality polyvinylpyrrolidone (PVP) that was 8% of the mixed solution, continued to stir for 4 hours, and left to stand for 2 hours to obtain the spinning stock solution, wherein the nano-Fe 2 o 3 The mass ratio with graphene oxide is 1:5; the Fe 2 o 3 The powder is nano-level, with a particle size of 300-500 nanometers; concentrated sulfuric acid and potassium permanganate are used as oxidants to oxidize graphite powder into graphite oxide, and then use ultrasonic stripping to peel gr...

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Abstract

The invention provides a porous nitrogen-doped carbon / Fe2O3 / graphene foamed flexible composite material and preparation method and application thereof. In the flexible composite material, Fe2O3 nanoparticle is coated with graphene, and nitrogen-doped carbon has a porous foam structure. The method comprises the steps of preparing pure melamine foam, performing calcination in nitrogen to obtain a nitrogen-doped carbon foam matrix, preparing to obtain a spinning solution after that nanometer Fe2O3, a graphene oxide solution and polyvinylpyrrolidone are mixed, taking the nitrogen-doped carbon foammatrix as a receiving device, directly spinning the spinning solution on carbon foam by a high-pressure electrostatic spinning technology to obtain a porous nitrogen-doped carbon / Fe2O3 / graphene oxide / PVP composite material, and obtaining the flexible composite material after high-temperature carbonization and cooling. The material is used for a negative electrode material of a lithium ion batteryand has the characteristics of favorable flexibility, high conductivity, high specific capacity and the like.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a porous nitrogen-doped carbon / Fe 2 o 3 / Graphene foam flexible composite material and its preparation method and application. Background technique [0002] In recent years, the demand for bendable and foldable flexible electronic devices has increased year by year, and flexible lithium-ion batteries are the core components of flexible electronic devices. Traditional lithium-ion batteries are mainly formed by coating active materials, conductive agents, and binders on metal current collectors, and drying and rolling. The electrode materials do not have flexibility, and the presence of current collectors greatly reduces the overall performance of the material energy density. Therefore, there is a need to develop self-supporting flexible electrode materials without binders, conductive agents, and current collectors to meet the needs of flexible electronics. [0003] At pres...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525
CPCH01M4/362H01M4/523H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 朱守超詹世英马美品
Owner YINLONG ENERGY CO LTD
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