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Lithium carbon dioxide battery positive electrode catalyst and preparation method thereof

A carbon dioxide and battery positive electrode technology, which is applied to battery electrodes, fuel cell half-cells, secondary battery-type half-cells, circuits, etc., can solve the problems of large particle size, poor electrical conductivity, and weak electrocatalytic activity. Achieve the effect of increasing battery capacity, reducing cost, and increasing reactive area

Active Publication Date: 2021-08-03
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to reduce the cost of the positive electrode catalyst of the lithium-air battery and solve the problems of large particle size of nickel oxide (NiO) in the positive electrode catalyst of the battery, poor electrical conductivity and weak electrocatalytic activity for carbon dioxide reduction reaction, the invention provides a lithium carbon dioxide The positive electrode catalyst of the battery also provides a preparation method of the positive electrode catalyst of the lithium carbon dioxide battery

Method used

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  • Lithium carbon dioxide battery positive electrode catalyst and preparation method thereof
  • Lithium carbon dioxide battery positive electrode catalyst and preparation method thereof
  • Lithium carbon dioxide battery positive electrode catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] The preparation operation steps of the lithium carbon dioxide battery cathode catalyst with high electrochemical performance are as follows:

[0027] (1) Dissolve 105.1 mg (0.36 mmol) nickel nitrate hexahydrate and 11.65 mg (0.04 mmol) cobalt nitrate hexahydrate in 40 mL deionized water, stir for 5 minutes, add 150 mg carbon nanotubes, and ultrasonically disperse for 2 hours to obtain Suspension.

[0028] (2) Magnetically stir the suspension in a water bath at 50°C for 2 hours, slowly drop into 0.5 mol / L sodium hydroxide solution until the pH value reaches 10, transfer to room temperature and let it stand for 1 hour to obtain a black precipitated product .

[0029] (3) After the above-mentioned black precipitate was washed by centrifugation with deionized water and absolute ethanol for 5 times, it was dried at a temperature of 80 °C for 10 hours, and placed in a tube furnace for 5 o The heating rate of C / min was raised to 300 ° C, calcined in nitrogen for 2 hours, and...

Embodiment 2

[0036] The preparation operation steps of the lithium carbon dioxide battery cathode catalyst with high electrochemical performance are as follows:

[0037] (1) Dissolve 93.4 mg (0.32 mmol) nickel nitrate hexahydrate and 23.30 mg (0.08 mmol) cobalt nitrate hexahydrate in 40 mL deionized water, stir for 5 minutes, add 150 mg carbon nanotubes, and ultrasonically disperse for 2 hours to obtain Suspension.

[0038] (2) Magnetically stir the suspension in a water bath at 50°C for 2 hours, slowly drop into 0.5 mol / L sodium hydroxide solution until the pH value reaches 10, transfer to room temperature and let it stand for 1 hour to obtain a black precipitated product .

[0039] (3) After the above-mentioned black precipitate was washed by centrifugation with deionized water and absolute ethanol for 5 times, it was dried at a temperature of 80 °C for 10 hours, and placed in a tube furnace for 5 o The heating rate of C / min was raised to 300 ° C, calcined in nitrogen for 2 hours, and ...

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Abstract

The invention relates to a lithium carbon dioxide battery positive electrode catalyst, and belongs to the technical field of batteries. The lithium carbon dioxide battery positive electrode catalyst is a cobalt-doped nickel oxide carbon nanotube material, the pore diameter of the porous structure material is 2-100 nm, and the size of cobalt-doped nickel oxide nanoparticles is 7-10 nm; when the material is used in a lithium carbon dioxide battery, the discharge capacity can reach 5848 mAh / g under the current density of 100 mA / g, and the coulombic efficiency is 92.81% when the charge cut-off voltage is 4.5 V; when the capacity is limited to 500 mAh / g, the overpotential can be reduced to 1.26 V, and the electrode can be stably charged and discharged for more than 500 hours without attenuation. According to the catalyst, the cost is effectively reduced, and the synthesis method is simple and efficient. The nano-particle size of the catalyst is reduced, so that the reaction active area is increased; the conductivity and the electrocatalytic activity of nickel oxide in the positive electrode catalyst are improved, and solid-state discharge products are favorably stored, so that the battery capacity is improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a high-efficiency and cheap lithium carbon dioxide battery cathode catalyst and a preparation method. Background technique [0002] The lithium carbon dioxide battery utilizes the redox reaction between metallic lithium and carbon dioxide (4Li+3CO 2 ↔2Li 2 CO 3 +C), realizing the dual functions of carbon dioxide recycling and electrochemical conversion storage. Due to its high discharge potential (~2.80 V) and theoretical energy density (~1876 Wh / kg), lithium-carbon dioxide batteries are considered to be a promising electrochemical energy storage technology. However, lithium carbonate, a solid-state discharge product, is relatively stable and difficult to decompose, leading to problems such as high charge-discharge overpotential and poor cycle stability, hindering the practical application and promotion of lithium-carbon dioxide batteries. Therefore, it is of gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86H01M4/88H01M12/08
CPCH01M4/9016H01M4/9083H01M4/8673H01M4/8605H01M4/88H01M12/08Y02E60/10
Inventor 谈鹏肖旭张卓君
Owner UNIV OF SCI & TECH OF CHINA
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