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Preparation method of carbon-coated-manganese oxide/nitrogen-doped reduced graphene oxide anode material for lithium ion battery

A lithium-ion battery, manganese monoxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of waste, large consumption of graphene oxide, etc., and achieve the effect of improving conductivity and improving cycle stability

Active Publication Date: 2017-09-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This system takes advantage of the reducibility of graphene oxide to reduce Mn 4+ , the consumption of graphene oxide is relatively large, resulting in a certain degree of waste

Method used

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  • Preparation method of carbon-coated-manganese oxide/nitrogen-doped reduced graphene oxide anode material for lithium ion battery
  • Preparation method of carbon-coated-manganese oxide/nitrogen-doped reduced graphene oxide anode material for lithium ion battery
  • Preparation method of carbon-coated-manganese oxide/nitrogen-doped reduced graphene oxide anode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) adding manganese acetate into water and stirring at room temperature to prepare a manganese acetate solution with a mass fraction of 2.5%;

[0026] 2) Take 30mg of graphene oxide and add it to 40ml of manganese acetate solution, stirring and ultrasonication at 60W power for 1h alternately for 3 times, and the dispersion is uniform;

[0027] 3) Transfer the mixture obtained in step 2) to a reactor, and conduct a microwave hydrothermal reaction at 120° C. for 1 h;

[0028] 4) The microwave hydrothermal reaction product obtained in step 3) was evenly mixed with 1.2 g of sucrose, and transferred to a polytetrafluoroethylene reactor for hydrothermal reaction at 150° C. for 12 hours;

[0029] 5) Filter the hydrothermal reaction product obtained in step 4), alternately wash with ethanol, deionized water, and acetone, and dry;

[0030] 6) The product obtained in step 5) is heat-treated at 500° C. for 2 hours in a mixed atmosphere furnace in which argon and ammonia are mixed...

Embodiment 2

[0036] 1) adding manganese acetate into water and stirring at room temperature to prepare a manganese acetate solution with a mass fraction of 3.5%;

[0037] 2) Take 30mg of graphene oxide and add it to 50ml of manganese acetate solution, stirring and ultrasonication at 70W power for 1h alternately for 4 times, and the dispersion is uniform;

[0038] 3) Transfer the mixture obtained in step 2) to a reactor, and conduct a microwave hydrothermal reaction at 150° C. for 2 hours;

[0039] 4) Mix the microwave hydrothermal reaction product obtained in step 3) with 2.0 g of sucrose evenly, and transfer it to a polytetrafluoroethylene reactor for hydrothermal reaction at 180°C for 16 hours;

[0040] 5) Filter the hydrothermal reaction product obtained in step 4), alternately wash with ethanol, deionized water, and acetone, and dry;

[0041] 6) The product obtained in step 5) is heat-treated at 600° C. for 1 h in a mixed atmosphere furnace in which argon and ammonia are mixed at a vo...

Embodiment 3

[0043] 1) adding manganese acetate into water and stirring at room temperature to prepare a manganese acetate solution with a mass fraction of 4.5%;

[0044] 2) Take 50mg of graphene oxide and add it to 45ml of manganese acetate solution, stirring and ultrasonication at 80W power for 1h alternately for 5 times, and the dispersion is uniform;

[0045]3) Transfer the mixture obtained in step 2) to a reaction kettle, and conduct a microwave hydrothermal reaction at 180° C. for 3 hours;

[0046] 4) Mix the microwave hydrothermal reaction product obtained in step 3) with 2.5 g of sucrose evenly, and transfer it to a polytetrafluoroethylene reactor for hydrothermal reaction at 180°C for 18 hours;

[0047] 5) Filter the hydrothermal reaction product obtained in step 4), alternately wash with ethanol, deionized water, and acetone, and dry;

[0048] 6) The product obtained in step 5) is heat-treated at 700° C. for 3 hours in a mixed atmosphere furnace in which argon and ammonia are mi...

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Abstract

The invention discloses a preparation method of a carbon-coated-manganese oxide / nitrogen-doped reduced graphene oxide anode material for a lithium ion battery. The preparation method comprises the following steps: using manganese acetate, graphene oxide and saccharose as main raw materials; firstly, obtaining a compound of manganese carbonate and reduced graphene oxide by adopting a microwave-hydrothermal method; secondly, obtaining a compound of carbon-coated manganese carbonate and the reduced graphene oxide by a traditional hydrothermal method; finally, carrying out heat treatment on the compound in an atmosphere furnace to obtain carbon-coated-manganese oxide particles, and loading the carbon-coated-manganese oxide particles on a reduced graphene oxide sheet; meanwhile, realizing nitrogen doping of graphene oxide, wherein the material can be used as a high-performance anode material of the lithium ion battery. According to the synthetic method, the graphene oxide is introduced into the first-time hydrothermal treatment process for improving poor electrical conductivity of MnO, and uniformly dispersing MnO particles on the surface of graphene; in the second-time hydrothermal treatment process, the surfaces of the MnO particles are coated with uniform carbon layers; a carbon shell is used as an elastic limiting body and can be used for preventing aggregation and pulverization of the MnO particles in the charge / discharge process; a buffer zone with volume expansion is provided for improving the cyclic stability of the material serving as the lithium ion battery to a great extent.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a method for preparing a carbon-coated manganese monoxide / nitrogen-doped reduced graphene oxide (MnO / NRGO) negative electrode material. Background technique [0002] In order to meet the increasing requirements of high energy consumption and high power density, transition metal oxides Fe 3 o 4 , CoO, NiO, CuO, and ZnO have been widely studied as anode materials for lithium-ion batteries due to their high theoretical specific capacity and environmental friendliness. Among them, manganese monoxide has a suitable electromotive force (<0.8 V) and high energy density, and is considered to be one of the most promising anode materials. But correspondingly, there are also some disadvantages, such as poor conductivity, large volume expansion, unstable structure and so on. Correspondingly, there are also some measures. For example, the preparation of porous manganese oxides inclu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/0525
CPCH01M4/366H01M4/502H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 曹丽云王瑞谊许占位李嘉胤黄剑锋李瑞梓李康
Owner SHAANXI UNIV OF SCI & TECH
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