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A self-supporting material with one-dimensional and two-dimensional hybrid structure for positive electrode of lithium-air battery and preparation method thereof

A self-supporting, hybrid technology, applied in fuel cell half-cells and secondary battery half-cells, nanotechnology for materials and surface science, battery electrodes, etc., can solve the problem that the catalytic activity is difficult to be fully utilized , It is difficult to obtain high capacity performance and other problems, to achieve excellent electrocatalytic activity, solve the effect of catalyst agglomeration, and increase the surface area of ​​catalytic activity

Active Publication Date: 2022-05-20
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small surface area of ​​nickel foam, the catalyst agglomerates when the surface grows, the catalytic activity is difficult to be fully utilized, and the discharge product lithium peroxide has nowhere to deposit, making it difficult to obtain high capacity performance.

Method used

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  • A self-supporting material with one-dimensional and two-dimensional hybrid structure for positive electrode of lithium-air battery and preparation method thereof
  • A self-supporting material with one-dimensional and two-dimensional hybrid structure for positive electrode of lithium-air battery and preparation method thereof
  • A self-supporting material with one-dimensional and two-dimensional hybrid structure for positive electrode of lithium-air battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] In this embodiment, a self-supporting material with a one-dimensional and two-dimensional hybrid structure for the positive electrode of a lithium-air battery and a preparation method thereof include the following steps:

[0034] (1) Soak the bulk carbon nanotube sponge in absolute ethanol solution for 2 min for hydrophilic treatment.

[0035] (2) Prepare the dispersion. Add 3.2 mmol of nickel nitrate, 14 mmol of urea, 0.77 mmol of ammonium fluoride, and 1 mmol of sodium chromate into a 40 mL Teflon reactor in sequence, and stir for 2 h to obtain a uniformly dispersed dispersion.

[0036] (3) Take the carbon nanotube sponge after hydrophilic treatment (1 cm×1 cm×3 mm), immerse it in the dispersion prepared in step (2), place it on a shaker and vibrate for 4 h, so that the dispersion completely infiltrates the sponge.

[0037] (4) Transfer the sponge-impregnated dispersion in step (3) to a 100 mL reactor for solvothermal reaction. The reaction condition is to keep warm ...

Embodiment 2

[0042] In this embodiment, a self-supporting material with a one-dimensional and two-dimensional hybrid structure for the positive electrode of a lithium-air battery and a preparation method thereof include the following steps:

[0043] (1) Soak the bulk carbon nanotube sponge in absolute ethanol solution for 2 min for hydrophilic treatment.

[0044] (2) Prepare the dispersion. Add 3.2 mmol of nickel nitrate, 14 mmol of urea, 0.77 mmol of ammonium fluoride, and 1 mmol of sodium tungstate into a 40 mL Teflon reactor in sequence, and stir for 2 h to obtain a uniformly dispersed dispersion.

[0045] (3) Take the carbon nanotube sponge after hydrophilic treatment (1 cm × 1 cm × 3 mm), immerse it in the dispersion prepared in step (2), place it on a shaker and vibrate for 4 h to make the dispersion completely infiltrate the sponge.

[0046] (4) Transfer the sponge-impregnated dispersion in step (3) to a 100 mL reactor for solvothermal reaction. The reaction condition is to keep wa...

Embodiment 3

[0051] In this embodiment, a self-supporting material with a one-dimensional and two-dimensional hybrid structure for the positive electrode of a lithium-air battery and a preparation method thereof include the following steps:

[0052] (1) Soak the carbon nanotube sponge in absolute ethanol solution for 2 min for hydrophilic treatment.

[0053] (2) Prepare the dispersion. Add 2.4 mmol of nickel nitrate, 0.8 mmol of ferric nitrate, 14 mmol of urea, 0.77 mmol of ammonium fluoride, and 1 mmol of sodium chromate into a 40 mL Teflon reactor in sequence, and stir for 2 h to obtain a uniform Dispersed dispersion.

[0054] (3) Take the carbon nanotube sponge after hydrophilic treatment (1 cm × 1 cm × 3 mm), immerse it in the dispersion prepared in step (2), place it on a shaker and vibrate for 4 h to make the dispersion completely infiltrate the sponge.

[0055] (4) Transfer the first dispersion soaked in sponge in step (3) to a 100 mL reactor for solvothermal reaction. The reactio...

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Abstract

The invention discloses a self-supporting material with a one-dimensional and two-dimensional hybrid structure for the positive electrode of a lithium-air battery and a preparation method thereof. Immerse the hydrophilic treated carbon nanotube sponge in the precursor solution of hydroxide, and shake to make the solution fully infiltrate the sponge; then transfer the solution and the sponge to the reactor for hydrothermal reaction; after the reaction, take out the sponge and wash it, After freeze-drying, a composite self-supporting material hybridized with one-dimensional carbon nanotubes and two-dimensional hydroxides was obtained. Using this material as a self-supporting cathode for lithium-air batteries can simultaneously achieve high-capacity, long-cycle electrochemical performance.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a self-supporting material with a one-dimensional and two-dimensional hybrid structure for the positive electrode of a lithium-air battery and a preparation method thereof. Background technique [0002] Lithium-air batteries have extremely high energy density, up to 3500 Wh / kg, which is nearly 10 times that of lithium-ion batteries. At the same time, lithium-air batteries have some advantages of lithium-ion batteries, such as green and pollution-free, no memory effect, and long cycle life. In the development trend of energy Internet in the future, human beings must look for secondary batteries with higher energy density while meeting the basic requirements of green, high efficiency, low cost and pollution-free. Obviously, lithium-air batteries are one of the good substitutes for lithium-ion batteries in the future. The charging and discharging process of lithium-air bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/86H01M12/08B82Y30/00B82Y40/00
CPCH01M4/9016H01M4/9083H01M4/8605H01M4/8673H01M12/08B82Y30/00B82Y40/00H01M2004/8689Y02E60/10
Inventor 曹安源赵博吴奕增
Owner PEKING UNIV
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