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Zinc electrode reduction regeneration recycling method of zinc-air battery

A zinc-air battery and zinc electrode technology, which is applied in the field of electrochemical technology and battery manufacturing, can solve the problems of uneven electrolyte flow rate, uneven current distribution, and high cost of electrolytic reduction, so as to prevent zinc oxidation and electrolyte failure, and improve Electric energy utilization rate and the effect of reducing energy consumption

Inactive Publication Date: 2020-02-21
刘伟春 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Effectively solve the problem of uneven flow rate of electrolyte in each independent electrolytic cell, uneven current distribution on the cathode and anode plates, high concentration polarization of the electrolyte on the plate surface, high cell voltage, and high DC energy consumption under the alkaline system. Low current efficiency, high cost of electrolytic reduction, etc.

Method used

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  • Zinc electrode reduction regeneration recycling method of zinc-air battery
  • Zinc electrode reduction regeneration recycling method of zinc-air battery
  • Zinc electrode reduction regeneration recycling method of zinc-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A zinc-air battery zinc electrode reduction regeneration recycling method is as follows: after the zinc-air battery is discharged, the product is separated from the current collector → enters the alkali solution tank at a specified ratio → filters the alkali solution → separates unreacted zinc for reuse → enters the saturated alkali solution Purification tank→electrolyte circulation tank→electrolyzer→electrolytic reduction of zinc (collecting reaction gas)→zinc collection tank→electrolyte returns to alkali solution tank for recycling; details are as follows:

[0027] S1. Separate the zinc from the current collector, crush the zinc electrode and send it to the constant-temperature stirring alkali-dissolving tank with KOH at a mass ratio of 4:1; the zinc particles in the constant-temperature stirring alkali-dissolving tank are less than 8cm 3 ; KOH alkali concentration 6mol / L; alkali-soluble mass ratio 4:1, temperature 30°C, stirring speed 50 rpm, dissolution time 2h; high...

Embodiment 2

[0030] Embodiment 2: The difference between embodiment 2 and embodiment is that the process parameter is the right end value

Embodiment 3

[0032] S1. Separate the zinc from the current collector, crush the zinc electrode and send it to the constant-temperature stirring alkali-dissolving tank at a mass ratio of 4:1 with KOH; wherein the zinc particles in the constant-temperature stirring alkali-dissolving tank are ≤8cm 3 ; KOH alkali concentration 6mol / L; alkali-soluble mass ratio 4:1, temperature 40°C, stirring speed 50 rpm, dissolution time 3h; high-power DC power supply for electrolytic reduction of metal zinc, which can use solar energy, wind energy, tidal energy, etc. New energy alternative

[0033] S2. After stirring the alkali solution at a constant temperature, perform filtration and separation through a filter separator, and then perform electrolyte purification; the flow rate of the filter separator is controlled to 6m 3 / h, the filter separator separates the solute from the solution when the electrolyte passes through; the unreacted zinc powder is separated, the separated electrolyte is tested, the zinc...

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Abstract

The invention provides a zinc electrode reduction regeneration recycling method of a zinc-air battery, and particularly relates to the technical fields of electrochemical technology and battery manufacturing. Zinc is separated from a current collector; an alkaline solution is stirred at constant temperature, filtering and separating are carried out by a filter separator, and an electrolyte is purified; the electrolyte in an electrolyte circulating tank is pumped into an electrolytic cell according to the flow rate of 3-5 m<3> per hour, a cathode plate and an anode plate of the electrolytic cell select alloy plates with small gas evolution amount, and a cathode selects a titanium alloy plate (or a magnesium alloy plate) to be sprayed with oxides (or a magnesium alloy and a lead alloy); an anode selects a nickel alloy plate; and a corrosion-resistant rubber wrapping edge is adopted around the cathode plate and the anode plate, the wrapping edge width is smaller than or equal to 20 mm, the areas of the cathode plate and the anode plate are 0.8 m<2>-1.0 m<2>, the thicknesses of the cathode plate and the anode plate are 2.0-3.5 mm, the bottom of the electrolytic cell is inclined by 20 degrees-30 degrees, and branched or taimos-shaped zinc is separated out from the cathode, automatically falls off at the lower part of the electrolytic cell through electro-deposition, and finally enters a zinc powder storage tank. The method has low reduction cost and high efficiency.

Description

technical field [0001] The invention belongs to the technical fields of electrochemical technology and battery manufacturing, and in particular relates to a zinc-air battery zinc electrode reduction regeneration recycling method. Background technique [0002] The mechanically replaceable zinc-air battery uses metal zinc as the negative electrode, and the discharge product of the zinc-air battery is the excessive product of zinc oxide (Zno) and zinc; the zinc-air battery can be converted from a primary battery to a secondary battery only by reducing the excessive product of ZnO and zinc to zinc. The secondary battery is a key link in the commercialization of mechanically replaceable zinc-air batteries. [0003] The zinc-air battery electrolyte uses KOH, Zn turns into ZnO during battery discharge, and a part of ZnO dissolves in KOH solution to form K 2 Zn(OH) 4 ; A part of Zn(OH) is generated 4 2- . In the case of high power output of zinc-air batteries, the formation rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/02C25C7/08C22B7/00C22B19/30C22B19/20H01M6/52
CPCC22B7/008C22B19/24C22B19/30C25C5/02C25C7/08H01M6/52Y02W30/84Y02P10/20
Inventor 刘伟春
Owner 刘伟春
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