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

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

Active Publication Date: 2022-02-25
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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  • One-dimensional and two-dimensional hybrid structure self-supporting material for positive electrode of lithium air battery and preparation method of one-dimensional and two-dimensional hybrid structure self-supporting material
  • One-dimensional and two-dimensional hybrid structure self-supporting material for positive electrode of lithium air battery and preparation method of one-dimensional and two-dimensional hybrid structure self-supporting material
  • One-dimensional and two-dimensional hybrid structure self-supporting material for positive electrode of lithium air battery and preparation method of one-dimensional and two-dimensional hybrid structure self-supporting material

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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 one-dimensional and two-dimensional hybrid structure self-supporting material for a positive electrode of a lithium air battery and a preparation method of the one-dimensional and two-dimensional hybrid structure self-supporting material. The method comprises: immersing the carbon nanotube sponge subjected to hydrophilic treatment into a precursor solution of hydroxide, and shaking to enable the solution to fully infiltrate the sponge; transferring the solution and the sponge into a reaction kettle for hydrothermal reaction; and after the reaction is finished, taking out the sponge, washing, and freeze-drying to obtain the one-dimensional carbon nanotube and two-dimensional hydroxide hybridized composite self-supporting material. When the material is used for a self-supporting positive electrode of a lithium air battery, high-capacity and long-cycle electrochemical performance can be realized at the same time.

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 Applications(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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