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Preparation method of manganese monoxide/nitrogen-doped reduced graphene oxide composite electrode material

A graphene composite, manganese monoxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor conductivity and structural instability, and achieve improved conductivity, increased active sites, and improved electrochemical performance. Effect

Inactive Publication Date: 2017-09-22
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to provide a manganese monoxide / nitrogen-doped reduced graphite oxide that can solve the shortcomings of poor conductivity and unstable structure of transition metal oxide MnO as the negative electrode material of lithium ion battery, and simple process, safety and short preparation cycle Preparation method of olefin composite electrode material

Method used

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  • Preparation method of manganese monoxide/nitrogen-doped reduced graphene oxide composite electrode material
  • Preparation method of manganese monoxide/nitrogen-doped reduced graphene oxide composite electrode material
  • Preparation method of manganese monoxide/nitrogen-doped reduced graphene oxide composite electrode material

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Effect test

Embodiment 1

[0023] 1) adding manganese acetate tetrahydrate and urea into water respectively with magnetic stirring to make them uniformly mixed to prepare a mixed solution with a mass fraction of manganese acetate of 3.5% and a mass fraction of urea of ​​4.6%;

[0024] 2) Take 30mg of graphene oxide and add it to 30ml of mixed solution, under stirring, with ultrasonic power of 60W, ultrasonically disperse for 2h to obtain a mixture;

[0025] 3) Transfer the mixture obtained in step 2) to a polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 120° C. for 12 hours;

[0026] 4) After filtering the hydrothermal reaction product obtained in step 3), it is washed alternately with deionized water, absolute ethanol and acetone, and then dried;

[0027] 5) The product obtained in step 4) was heat-treated at 400°C for 5h in an argon atmosphere to obtain a solid form of manganese monoxide / nitrogen doped reduction with a particle size of 100nm on which granular MnO was loaded on a...

Embodiment 2

[0032] 1) adding manganese acetate tetrahydrate and urea into water respectively with magnetic stirring to make them evenly mixed to prepare a mixed solution with a mass fraction of manganese acetate of 4.5% and a mass fraction of urea of ​​4.0%;

[0033] 2) Take 70mg of graphene oxide and add it to 50ml of the mixed solution, under stirring, with ultrasonic power of 70W, ultrasonically disperse for 3h to obtain a mixture;

[0034] 3) Transfer the mixture obtained in step 2) to a polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 120° C. for 6 hours;

[0035] 4) After filtering the hydrothermal reaction product obtained in step 3), it is washed alternately with deionized water, absolute ethanol and acetone, and then dried;

[0036] 5) The product obtained in step 4) was heat-treated at 400°C for 4h in an argon atmosphere to obtain a solid shape of granular MnO supported on a graphene sheet, with a particle size of 100nm manganese monoxide / nitrogen doped re...

Embodiment 3

[0038] 1) adding manganese acetate tetrahydrate and urea into water respectively with magnetic stirring to make them evenly mixed to prepare a mixed solution with a mass fraction of manganese acetate of 5.0% and a mass fraction of urea of ​​3.5%;

[0039] 2) Take 50mg of graphene oxide and add it to 60ml of mixed solution, under stirring, with ultrasonic power of 80W, ultrasonically disperse for 2h to obtain a mixture;

[0040] 3) Transfer the mixture obtained in step 2) to a polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 150° C. for 10 h;

[0041]4) After filtering the hydrothermal reaction product obtained in step 3), it is washed alternately with deionized water, absolute ethanol and acetone, and then dried;

[0042] 5) The product obtained in step 4) was heat-treated at 500°C for 3h in an argon atmosphere to obtain a solid form of manganese monoxide / nitrogen doped reduction with a particle size of 100nm on a graphene sheet in the form of granular M...

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Abstract

The invention discloses a preparation method of a manganese monoxide / nitrogen-doped reduced graphene oxide composite electrode material. Manganese acetate, graphene and urea are regarded as main raw materials; and the preparation method comprises the steps of firstly preparing a compound of manganese carbonate and graphene by adopting a hydrothermal method; then carrying out heat treatment for the compound in a tubular atmosphere furnace to prepare granular MnO loaded on a thin graphene sheet; meanwhile, carrying out nitrogen doping for the graphene to enable the graphene to serve as an anode material for a lithium-ion battery. Due to addition of the urea in the synthetic method, for one thing, N atoms are introduced to dope the graphene, defects on the surface of the graphene are increased, the active sites are increased and the adsorptive growth of the Mn2+ is better facilitated; and for another, the urea which has a certain dispersion effect in the whole system enables the MnO particles to be uniformly diffused on the graphene sheet. As the MnO particles are loaded on the reduced graphene oxide sheet, the poor conductivity of the MnO is not only improved, but also gathering and powdering of the MnO particles in a continuous charging and discharging process is prevented; and accordingly, the electrochemical performance of the MnO particles is effectively improved.

Description

technical field [0001] The invention belongs to the field of secondary batteries, and in particular relates to a method for preparing a manganese monoxide / nitrogen-doped reduced graphene oxide (MnO / NRGO) composite electrode material. Background technique [0002] With the development of human beings and the progress of society, energy and environmental issues have become the two major themes of the development of the world today. People's excessive dependence on natural energy such as oil and natural gas will lead to unstable development of society and economy, which makes people realize the urgency of developing renewable energy and storage systems. At present, the green and pollution-free new battery system has become a hotspot that countries all over the world are competing to develop. On the one hand, it can store energy provided by sustainable energy sources such as wind energy and solar energy; on the other hand, using batteries as energy supplies for vehicles can gre...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/0525
CPCH01M4/362H01M4/502H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 曹丽云王瑞谊康倩许占位黄剑锋李嘉胤王彩薇
Owner SHAANXI UNIV OF SCI & TECH
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