Polypyrrole-clad nano spherical zinc oxide material and preparation method

Abstract

The invention relates to a polypyrrole-clad nano spherical zinc oxide material with a core-shell structure and a preparation method. The polypyrrole-clad nano spherical zinc oxide material takes nano spherical zinc oxide as a core and polypyrrole as a shell cladding the surface of a zinc oxide particle. The preparation method comprises the steps of adding a precipitant such as hexamine to a zinc source, preparing a nano spherical zinc oxide particle by a hydrothermal reaction, adding nano zinc oxide to a solution containing a surfactant to form zinc oxide sol, adding a pyrrole monomer and an oxidant, performing in-situ oxidation polymerization, and forming a polypyrrole-clad layer on the surface of the zinc oxide particle. The prepared polypyrrole-clad nano zinc oxide material with the core-shell structure has a larger specific surface area; the activity of the nano zinc oxide material is improved; aggregation of the nano zinc oxide particle can be well avoided; existing of the polypyrrole-clad layer effectively alleviates pine-tree crystal forming of the zinc oxide particle in charging and discharging processes; and the cycle life of an electrode is significantly prolonged.

Description

technical field

[0001] The invention relates to a polypyrrole-coated nano-zinc oxide material and a preparation method, which can effectively improve the reversibility and Coulomb efficiency of the electrode when applied to the negative electrode of a nickel-zinc alkaline secondary battery, and improve the cycle life of the electrode. The technical field of anode materials for secondary nickel-zinc batteries. Background technique

[0002] As the most widely used anode material in aqueous primary battery systems, zinc electrodes have many advantages, such as high energy density, high open circuit voltage, no pollution to the environment, abundant reserves and low cost. Therefore, attempts to apply zinc electrodes in alkaline secondary batteries have been attracting attention. However, when used as a negative electrode material for a secondary battery, since its discharge product is easily soluble in the electrolyte, the dissolved active material will be unevenly deposited on...

Examples

Embodiment 1

[0030] Take 200mg of zinc acetate and dissolve it in 50ml of deionized water, and take another 70mg of hexamethylenetetramine and dissolve it in 50ml of deionized water, mix the above two solutions, stir for 5 minutes, then transfer to a 200ml hydrothermal reactor, keep the water The thermal reaction temperature is 160° C. After 8 hours of reaction, it is naturally cooled, taken out for suction filtration, washed with deionized water and ethanol for several times, and dried to obtain nano-spherical zinc oxide particles. Dissolve 37mg of sodium dodecyl sulfonate in 50ml of deionized water, and add 100mg of nano-zinc oxide to the above solution, ultrasonically stir for 10 minutes to make the zinc oxide form a stable and dispersed nano-sol, and place the above-mentioned sol in a 5°C incubator. , continue stirring, add 20 mg of pyrrole monomer, stir for 30 minutes to fully dissolve, and dissolve 68 mg of ammonium persulfate in 10 ml of deionized water, add the ammonium persulfate s...

Embodiment 2

[0032]Dissolve 200mg of zinc acetate in 80ml of ethylene glycol, and take another 15mg of sodium hydroxide and dissolve it in 20ml of deionized water, mix the above two solutions, stir for 30 minutes, then transfer the mixed solution to a 200ml hydrothermal reactor, keep The hydrothermal reaction temperature is 150° C. After 10 hours of reaction, it is naturally cooled, taken out for suction filtration, washed with deionized water and ethanol for several times, and dried to obtain nano-spherical zinc oxide particles. Take 55mg of polyethylene glycol (PEG400) and dissolve it in 50ml of deionized water, add 100mg of nano-zinc oxide to the above solution, ultrasonically stir for 30 minutes to make zinc oxide form a stably dispersed nano-sol, and place the above-mentioned sol in a 0°C incubator. , continue stirring, add 15mg of pyrrole monomer, stir for 30 minutes to make it fully dissolved, take another 10ml of hydrogen peroxide and dissolve it in 10ml of deionized water, add the ...

Embodiment 3

[0034] Take 200mg of zinc acetate and dissolve it in 50ml of deionized water, take another 25mg of urea in 50ml of deionized water, mix the above two solutions, stir for 10 minutes, then transfer to a 200ml hydrothermal reaction kettle, keep the hydrothermal reaction temperature at 180 degrees Celsius, After 6 hours of reaction, it was naturally cooled, taken out for suction filtration, washed with deionized water and ethanol for several times, and dried to obtain nano-spherical zinc oxide particles. Dissolve 30 mg of sodium laurate in 50 ml of deionized water, and add 100 mg of nano-zinc oxide to the above solution, and ultrasonically stir for 20 minutes to form a stable and dispersed nano-sol. , add 15mg of pyrrole monomer, stir for 30 minutes to fully dissolve, and take another 55mg of ammonium persulfate and dissolve it in 10ml of deionized water, add the ammonium persulfate solution dropwise to the nano-zinc oxide sol containing pyrrole monomer, the addition is completed. ...

technical field

[0001] The invention relates to a polypyrrole-coated nano-zinc oxide material and a preparation method, which can effectively improve the reversibility and Coulomb efficiency of the electrode when applied to the negative electrode of a nickel-zinc alkaline secondary battery, and improve the cycle life of the electrode. The technical field of anode materials for secondary nickel-zinc batteries. Background technique

[0002] As the most widely used anode material in aqueous primary battery systems, zinc electrodes have many advantages, such as high energy density, high open circuit voltage, no pollution to the environment, abundant reserves and low cost. Therefore, attempts to apply zinc electrodes in alkaline secondary batteries have been attracting attention. However, when used as a negative electrode material for a secondary battery, since its discharge product is easily soluble in the electrolyte, the dissolved active material will be unevenly deposited on...

Examples

Embodiment 1

[0030] Take 200mg of zinc acetate and dissolve it in 50ml of deionized water, and take another 70mg of hexamethylenetetramine and dissolve it in 50ml of deionized water, mix the above two solutions, stir for 5 minutes, then transfer to a 200ml hydrothermal reactor, keep the water The thermal reaction temperature is 160° C. After 8 hours of reaction, it is naturally cooled, taken out for suction filtration, washed with deionized water and ethanol for several times, and dried to obtain nano-spherical zinc oxide particles. Dissolve 37mg of sodium dodecyl sulfonate in 50ml of deionized water, and add 100mg of nano-zinc oxide to the above solution, ultrasonically stir for 10 minutes to make the zinc oxide form a stable and dispersed nano-sol, and place the above-mentioned sol in a 5°C incubator. , continue stirring, add 20 mg of pyrrole monomer, stir for 30 minutes to fully dissolve, and dissolve 68 mg of ammonium persulfate in 10 ml of deionized water, add the ammonium persulfate s...

Embodiment 2

[0032]Dissolve 200mg of zinc acetate in 80ml of ethylene glycol, and take another 15mg of sodium hydroxide and dissolve it in 20ml of deionized water, mix the above two solutions, stir for 30 minutes, then transfer the mixed solution to a 200ml hydrothermal reactor, keep The hydrothermal reaction temperature is 150° C. After 10 hours of reaction, it is naturally cooled, taken out for suction filtration, washed with deionized water and ethanol for several times, and dried to obtain nano-spherical zinc oxide particles. Take 55mg of polyethylene glycol (PEG400) and dissolve it in 50ml of deionized water, add 100mg of nano-zinc oxide to the above solution, ultrasonically stir for 30 minutes to make zinc oxide form a stably dispersed nano-sol, and place the above-mentioned sol in a 0°C incubator. , continue stirring, add 15mg of pyrrole monomer, stir for 30 minutes to make it fully dissolved, take another 10ml of hydrogen peroxide and dissolve it in 10ml of deionized water, add the ...

Embodiment 3

[0034] Take 200mg of zinc acetate and dissolve it in 50ml of deionized water, take another 25mg of urea in 50ml of deionized water, mix the above two solutions, stir for 10 minutes, then transfer to a 200ml hydrothermal reaction kettle, keep the hydrothermal reaction temperature at 180 degrees Celsius, After 6 hours of reaction, it was naturally cooled, taken out for suction filtration, washed with deionized water and ethanol for several times, and dried to obtain nano-spherical zinc oxide particles. Dissolve 30 mg of sodium laurate in 50 ml of deionized water, and add 100 mg of nano-zinc oxide to the above solution, and ultrasonically stir for 20 minutes to form a stable and dispersed nano-sol. , add 15mg of pyrrole monomer, stir for 30 minutes to fully dissolve, and take another 55mg of ammonium persulfate and dissolve it in 10ml of deionized water, add the ammonium persulfate solution dropwise to the nano-zinc oxide sol containing pyrrole monomer, the addition is completed. ...

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