Iron ion-doped nanometer manganous-manganic oxide/multilayer graphene composite material and preparation method thereof, and lithium battery using same

A technology of multi-layer graphene and trimanganese tetroxide, which is applied in the field of materials, can solve the problems of long preparation period and complicated preparation process, and achieve the effect of easy process, simple preparation process and convenient industrial production

Active Publication Date: 2018-08-03
嘉善县国创新能源研究院
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the above method has disadvantages such as complicated preparation process and long preparation cycle, and cannot be well applied in large-scale industrial production.

Method used

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  • Iron ion-doped nanometer manganous-manganic oxide/multilayer graphene composite material and preparation method thereof, and lithium battery using same
  • Iron ion-doped nanometer manganous-manganic oxide/multilayer graphene composite material and preparation method thereof, and lithium battery using same
  • Iron ion-doped nanometer manganous-manganic oxide/multilayer graphene composite material and preparation method thereof, and lithium battery using same

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preparation example Construction

[0031] see figure 1 , which is a flow chart of steps for the preparation method of iron ion-doped trimanganese tetraoxide / multilayer graphene composite material according to an embodiment of the present invention, which includes the following steps:

[0032] S10, measure dimethylformamide DMF and distilled water with a volume ratio of 8:2, mix them as a mixed solvent, and the sum of their volumes is used to calculate the concentration of other additives;

[0033] S20, adding expanded graphite and ultrasonically oscillating for 2-5 hours to obtain a mixed solution of multilayer graphene;

[0034] S30, add manganese acetate tetrahydrate and ferrous chloride tetrahydrate to the multi-layer graphene mixed solution, stir at a constant temperature of 30°C for 5-10 minutes, pour the solution into a hydrothermal reaction kettle, and keep it warm at a temperature of 100°C-130°C Cool to room temperature after 2-5 hours;

[0035] S40, taking out the reactants, washing them by centrifu...

Embodiment 1

[0038] Measure and mix 8ml of DMF and 2ml of distilled water as a mixed solvent, add 20mg of expanded graphite, and ultrasonically vibrate for 2 hours to obtain a multilayer graphene mixed solution. Add 116mg Mn(Ac) to the mixed solution 2 4H 2 O and 5mg Fe(Cl) 2 4H 2 O was stirred for 10 minutes; the solution was poured into the hydrothermal reactor, so that the filling degree of the solution in the hydrothermal reactor was 45%. Keep warm at 100°C for 2 hours and then cool to room temperature; take out the reactants and wash them with alcohol and distilled water for 3 times, and finally dry them in a drying oven at 60°C for 24 hours to obtain iron-doped trimanganese tetraoxide / multilayer graphene composite Material. see figure 2 and image 3 , which are the XRD pattern and scanning electron microscope pattern of the iron-doped trimanganese tetraoxide / multilayer graphene composite, respectively, from image 3 It can be seen that the distribution density of manganese tetr...

Embodiment 2

[0040] Measure and mix 8ml of DMF and 2ml of distilled water as a mixed solvent, add 20mg of expanded graphite, and ultrasonically vibrate for 3 hours to obtain a multilayer graphene mixed solution. Add 110mg Mn(Ac) to the mixed solution 2 4H 2 O and 10mg Fe(Cl) 2 4H 2 O was stirred for 5 minutes; the solution was poured into the hydrothermal reactor, so that the filling degree of the solution in the hydrothermal reactor was 45%. Keep warm at 100°C for 3 hours and then cool to room temperature; take out the reactants and wash them with alcohol and distilled water for 4 times, and finally dry them in a drying oven at 60°C for 24 hours to obtain iron-doped trimanganese tetraoxide / multilayer graphene composite Material. see Figure 4 , which is the scanning electron microscope image of iron-doped trimanganese tetraoxide / multilayer graphene composite material, from Figure 4 It can be seen that trimanganese tetraoxide particles are evenly distributed on the surface of graphe...

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Abstract

Embodiments of the invention disclose an iron ion-doped nanometer manganous-manganic oxide / multilayer graphene composite material and a preparation method thereof, and a lithium battery using the composite material. The preparation method comprises the following steps: measuring DMF and distilled water in a volume ratio of 8: 2, and carrying out mixing to obtained a mixed solvent; adding expandedgraphite and carrying out ultrasonic vibration for 2-5 hours to obtain a multilayer graphite flake; adding manganese acetate tetrahydrate and ferrous chloride tetrahydrate in a certain ration into themixed solution, carrying out stirring at a constant temperature of 30 DEG C for 10-15 minutes, pouring the solution into a hydrothermal reaction kettle, carrying out hydrothermal treatment at a temperature of 100 to 130 DEG C for 1-5 hours, and then carrying out cooling to room temperature; subjecting a reactant of the previous step to centrifugal washing with alcohol and water 3-5 times respectively; and carrying out drying in a drying oven with a temperature of 60-80 DEG C to obtain the composite material. According to the invention, through doping of a reaction solution with iron ions, thedispersibility of manganous-manganic oxide nanoparticles is improved, and gaps among the nanoparticles are increased, so buffering is provided for volume effect during the charging and discharging process of the oxide and the electrochemical performance of the composite material is improved.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to an iron ion-doped nanometer trimanganese tetraoxide / multilayer graphene composite material, a preparation method thereof, and a lithium battery using the same. Background technique [0002] Manganese oxides have great application value in the fields of catalysts, lithium-ion batteries, molecular adsorption, and gas-sensitive materials. where MnO 2 Due to the characteristics of high specific capacity, abundant resources, low price and environmental friendliness, there have been many researches and breakthroughs in the field of supercapacitors. while Mn 3 o 4 It has a wide range of applications in ultra-high magnetic data storage, resonance imaging, drug delivery, lithium-ion batteries, and biosensors. [0003] During the process of intercalation and deintercalation of lithium, transition metal oxides have serious volume changes, resulting in poor cycle performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/052
CPCH01M4/362H01M4/502H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 徐军明吴凡胡晓萍宋开新武军高慧芳姚亚廖堃韩震
Owner 嘉善县国创新能源研究院
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