Manganese oxide/nickel micro-sphere with porous structure, and preparation and application thereof

A porous structure, manganese oxide technology, applied in structural parts, electrochemical generators, electrical components, etc., can solve the problems of poor conductivity, poor actual capacity and cycle stability of materials, and easily damaged structures, and achieves less impurities, The effect of controllable product morphology, enhanced specific capacity and cycle stability

Active Publication Date: 2017-06-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of MnO material is poor, and the structure is easily destroyed during the cycle, resulting in poor actual capacity and cycle stability of the material.

Method used

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  • Manganese oxide/nickel micro-sphere with porous structure, and preparation and application thereof
  • Manganese oxide/nickel micro-sphere with porous structure, and preparation and application thereof
  • Manganese oxide/nickel micro-sphere with porous structure, and preparation and application thereof

Examples

Experimental program
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Effect test

example 1

[0031] Add manganese acetate and nickel acetate into 10 mL of deionized water at a molar ratio of 2:1, the total ion concentration of manganese and nickel is 0.15 mol / L, and stir at room temperature until clear. Add urea to water at a molar ratio of 1.5:1 to metal ions, and stir until clear. Add 20mL of ethylene glycol into the prepared mixed solution, mix well, transfer to a 50mL hydrothermal reaction kettle, and heat at 180°C for 30h. The resulting product was centrifuged and washed several times with water and ethanol, then dried at 70°C. The obtained precursor was placed in a tube furnace to raise the temperature to 500°C at a rate of 5°C / min, and the protective atmosphere was argon. After holding for 2 hours, manganese oxide / nickel microspheres with a porous structure were obtained. Adopt Japanese science D / max-2500 type X-ray diffraction analyzer to analyze gained sample, obtained result is as follows figure 1 shown. Observing the sample with a Nova NanoSEM 230 scanni...

Embodiment 2

[0033] Add manganese acetate and nickel acetate into 10 mL of deionized water at a molar ratio of 4:1, the total ion concentration of manganese and nickel is 0.2 mol / L, and stir at room temperature until clear. Add urea to water in a molar ratio of 5:1 to metal ions, and stir until clear. Add 20 mL of isopropanol into the prepared mixed solution, mix well, transfer to a 50 mL hydrothermal reaction kettle, and heat at 200° C. for 20 h. The resulting product was centrifuged and washed several times with water and ethanol, then dried at 70°C. The obtained precursor was placed in a tube furnace to raise the temperature to 400°C at a rate of 8°C / min, and the protective atmosphere was argon. After holding for 7 hours, manganese oxide / nickel microspheres with a porous structure were obtained. Observing the sample with a Nova NanoSEM 230 scanning electron microscope from FEI Company in the United States, it was found that the spindle-shaped particles were uniformly distributed and th...

Embodiment 3

[0035] Add manganese acetate and nickel acetate into 10 mL of deionized water at a molar ratio of 8:1, the total ion concentration of manganese and nickel is 0.5 mol / L, and stir at room temperature until clear. Add urea to water in a molar ratio of 6:1 to metal ions, and stir until clear. Add 20mL of methanol into the prepared mixed solution, mix well, transfer to a 50mL hydrothermal reaction kettle, and heat at 100°C for 35h. The resulting product was centrifuged and washed several times with water and ethanol, then dried at 70°C. The obtained precursor was placed in a tube furnace at a heating rate of 3°C / min to 600°C, the protective atmosphere was argon, and after holding for 2 hours, porous manganese oxide / nickel microspheres were obtained.

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Abstract

The invention discloses a manganese oxide / nickel micro-sphere with a porous structure, and a preparation method and application thereof. The preparation method comprises the steps of adopting manganese acetate and nickel acetate as a manganese source and a nickel source, adopting urea as a precipitator, adopting water and ethylene glycol as solvents, firstly adopting a hydrothermal method for synthesizing a carbonate precursor of manganese and nickel, and then calcining under an argon atmosphere to obtain the manganese oxide / nickel micro-sphere with the porous structure. Manganese and nickel elements in the micro-sphere are distributed uniformly, the sphere is formed by self-assembly of nanoparticles, meanwhile, a lot of staggered nanosheets exist on the surface of the sphere, each nanosheet is formed by overlapping two layers of thinner nanosheets, a gap exists between the layers, and the specific surface area is larger. The porous structure assembled by secondary particles is not only beneficial for full contact of an electrolyte and an active substance, but also effectively adapt to volume expansion of a material in a charging and discharging process, so that the electrochemical performance of the manganese oxide / nickel micro-sphere when being used as a lithium ion battery cathode material is greatly improved. The preparation method provided by the invention is easy and convenient to operate, controllable in reaction conditions, and easy for scale-up experiment.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials of lithium ion batteries, and in particular relates to a composite material of manganese oxide / nickel microspheres with a porous structure, a preparation method thereof and an application in lithium ion batteries. Background technique [0002] Lithium-ion batteries have been used in more and more fields, such as electric vehicles, notebook computers, mobile phones, etc., due to their advantages such as high energy density, long cycle life, environmental friendliness and no pollution. Graphite, as a traditional lithium-ion battery anode material, is increasingly difficult to meet the needs of next-generation lithium-ion batteries due to its low specific capacity (372mAh / g). Transition metal oxides have attracted great attention because of their high theoretical specific capacity, abundant reserves, and mature preparation processes. Manganese resources are extrem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M10/0525
CPCH01M4/362H01M4/502H01M4/523H01M10/0525Y02E60/10
Inventor 潘安强孔祥忠梁书全唐艳
Owner CENT SOUTH UNIV
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