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A preparation method of an integrated positive electrode with an efficient reaction interface in a composite zinc-air battery

A zinc-air battery and reaction interface technology, applied in battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, circuits, etc., to achieve good gas-phase transport, reduce charging voltage, and optimize uniformity.

Active Publication Date: 2022-03-01
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the interface problem of the integrated electrode of the composite zinc-air battery, the present invention provides a method for preparing an integrated positive electrode with a high-efficiency reaction interface in the composite zinc-air battery

Method used

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  • A preparation method of an integrated positive electrode with an efficient reaction interface in a composite zinc-air battery
  • A preparation method of an integrated positive electrode with an efficient reaction interface in a composite zinc-air battery
  • A preparation method of an integrated positive electrode with an efficient reaction interface in a composite zinc-air battery

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Embodiment 1

[0023] The specific operation steps for the preparation of an integrated positive electrode with a high-efficiency reaction interface in a composite zinc-air battery are as follows:

[0024] (1) Dissolve 0.05g of PTFE dispersion in 40mL of deionized water, stir for 5 minutes, and pour it into a 50mL hydrothermal kettle with a polytetrafluoroethylene liner;

[0025] (2) Place the integrated electrode in the hydrothermal kettle and completely submerge it in the precursor solution, close the hydrothermal kettle, and set the temperature at 100 o Under the condition of C, the water is heated for 0.5 hours;

[0026] (3) Take out the electrode after hydroheating, dry it in a vacuum environment for 1 hour, place it in a tube furnace, and heat it with 10 o The heating rate of C / min is raised to 300 o C, calcined for 1 hour under nitrogen atmosphere, and cooled to room temperature with the furnace to obtain the positive electrode of the battery.

[0027] Electrodes are tested for hyd...

Embodiment 2

[0029] The specific operation steps for the preparation of an integrated positive electrode with a high-efficiency reaction interface in a composite zinc-air battery are as follows:

[0030] (1) Dissolve 0.05g of PTFE dispersion in 40mL of deionized water, stir for 5 minutes, and pour it into a 50mL hydrothermal kettle with a polytetrafluoroethylene liner;

[0031] (2) Place the integrated electrode in the hydrothermal kettle and completely submerge it in the precursor solution, close the hydrothermal kettle, and set the temperature at 100 o Under the condition of C, heat water for 1 hour;

[0032] (3) Take out the electrode after hydroheating, dry it in a vacuum environment for 1 hour, place it in a tube furnace, and heat it with 10 o The heating rate of C / min is raised to 300 o C, calcined for 1 hour under nitrogen atmosphere, and cooled to room temperature with the furnace to obtain the positive electrode of the battery.

[0033] The electrode is tested for hydrophilicity,...

Embodiment 3

[0035] The specific operation steps for the preparation of an integrated positive electrode with a high-efficiency reaction interface in a composite zinc-air battery are as follows:

[0036] (1) Dissolve 0.1g of PTFE dispersion in 40mL of deionized water, stir for 5 minutes, and pour it into a 50mL hydrothermal kettle with a polytetrafluoroethylene liner;

[0037] (2) Place the integrated electrode in the hydrothermal kettle and completely submerge it in the precursor solution, close the hydrothermal kettle, and set the temperature at 100 o Under the condition of C, heat water for 1 hour;

[0038] (3) Take out the electrode after hydroheating, dry it in a vacuum environment for 1 hour, place it in a tube furnace, and heat it with 10 o The heating rate of C / min is raised to 300 o C, calcined for 1 hour under nitrogen atmosphere, and cooled to room temperature with the furnace to obtain the positive electrode of the battery.

[0039] The electrode was tested for hydrophilicit...

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Abstract

The invention relates to a method for preparing an integrated positive electrode with a high-efficiency reaction interface in a composite zinc-air battery, which belongs to the technical field of batteries. Operation steps: (1) Prepare the precursor solution first and pour it into a hydrothermal kettle lined with PTFE; (2) Put the integrated positive electrode into the hydrothermal kettle and immerse it in the precursor solution heat treatment; (3) drying in a vacuum environment, calcining in a nitrogen atmosphere, and cooling to obtain a positive electrode. The invention optimizes the uniformity of polytetrafluoroethylene particles on the surface of the cobalt tetroxide electrode, avoiding the influence of agglomeration on the performance of the electrode active material; the electrode contact angle of the positive electrode of the invention is 104.7 o ~115.3 o ; The maximum power density of the assembled composite zinc-air battery is 38-50mW / cm 2 ; when the current density is 10mA / cm 2 , the capacity of the zinc-cobalt battery segment is changed from 0.28mAh / cm 2 Increase to 0.31~0.37mAh / cm 2 , The utilization rate of active materials increased from 31% to 35-41%; the discharge voltage of the zinc-air battery section increased from 0.98V to 1.10-1.13V, and the charging voltage decreased from 2.09V to 2.05-2.07V.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for preparing an integrated positive electrode with a high-efficiency reaction interface in a composite zinc-air battery. Background technique [0002] A composite zinc-air battery is a secondary battery that uses metal zinc as the negative electrode, transition metal oxides (such as cobalt-based oxides) as the positive electrode, and alkaline aqueous solution as the electrolyte. When discharging, the positive electrode of the battery first undergoes the reduction reaction of cobalt-based oxides, and when the active material drops to a low valence state, it continues to catalyze the oxygen reduction reaction (ORR); while charging, the first oxidation reaction of cobalt-based oxides occurs, When the active species rises to a high valence state, it continues to catalyze the oxygen evolution reaction (OER). This kind of battery combines the characteristics of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M12/08
CPCH01M4/88H01M12/08
Inventor 谈鹏尚文旭俞文涛马彦义
Owner UNIV OF SCI & TECH OF CHINA
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