Zinc-nickel flow battery negative electrode, application and zinc-nickel flow battery

A liquid flow battery and flow battery technology, applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve problems such as system stability hazards, excessive zinc, etc.

Active Publication Date: 2020-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the oxygen evolution at the positive electrode, the current efficiency of the positive electrode is much lower than that of the negative electrode.
As a result, after the activation is completed, the negative electrode will accumulate more elemental zinc
Dissolution can lead to blockage of the flow channel and short circuit of the positive and negative electrodes, which will seriously harm the stability of the system

Method used

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  • Zinc-nickel flow battery negative electrode, application and zinc-nickel flow battery
  • Zinc-nickel flow battery negative electrode, application and zinc-nickel flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Negative electrode preparation: the substrate is 36cm 2 Carbon felt, impregnated in 1.0mol / L zinc acetate solution, impregnated for 30min at a temperature of 30°C; dried at 60°C, transferred to a tube furnace, and burned at 400°C for 3h in an oxygen atmosphere to obtain the desired negative electrode.

[0020] The positive pole is loaded with 5mg / cm 2 Carbon Felt of Nickel Hydroxide.

[0021] Use it to assemble the battery, the negative electrode electrolyte is 6L of alkaline solution of 4mol / L potassium hydroxide containing 0.5 mol / L zinc ion; the positive electrode electrolyte is the alkaline solution of potassium hydroxide containing 0.5 mol / L zinc ion 6L; using 10mA / cm 2 The current density for charging, 40mA / cm 2 The current density of the discharge cycle is carried out. The charging cut-off condition of the battery is that the voltage is not higher than 2.0V, and the discharge cut-off condition is that the voltage is not lower than 2V. From figure 1 It can b...

Embodiment 2

[0023] The base is 36cm 2 Carbon felt, impregnated in 2.0mol / L zinc sulfate solution, soaked for 60min at a temperature of 50°C; dried at 80°C, transferred to a tube furnace, and burned at 300°C for 5h in an oxygen atmosphere. Get the required samples.

Embodiment 3

[0025] The base is 36cm 2 Carbon felt, impregnated in 1.5mol / L zinc nitrate solution, soaked for 40min at a temperature of 40°C; after drying at 70°C, transferred to a tube furnace, and burned at 350°C for 4h in an oxygen atmosphere. Get the required samples.

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Abstract

The invention relates to a zinc-nickel flow battery, in particular to a zinc-nickel flow battery negative electrode. Zinc oxide is attached to the surface of a substrate. The specific preparation process comprises the following steps of: soaking a matrix in a soluble zinc salt solution for 10-60 minutes at the temperature of 30-50 DEG C, drying at 60-80 DEG C, transferring into a tubular furnace,and firing for 1-5 hours at 300-400 DEG C in an oxygen atmosphere, and obtaining a desired negative electrode. The problem of zinc accumulation of the zinc negative electrode is solved.

Description

technical field [0001] The invention relates to the field of a zinc-nickel flow battery, in particular to a negative electrode of a zinc-nickel flow battery. [0002] technical background [0003] Zinc-nickel flow battery is a new type of low-cost, high-efficiency, and environment-friendly flow energy storage battery. It has the advantages of high energy density and current efficiency, simple and easy operation of the device, long service life, and low cost. Its main application It is widely used in power grid peak shaving, renewable energy power generation such as wind energy and solar energy, electric vehicles and other fields. [0004] The zinc / nickel flow battery has only one electrolyte storage tank, the electrolyte is a flowing zincate alkaline solution, no ion exchange membrane is used in the battery, and the current is formed by the free flow of ions in the battery cavity and the directional movement of the electrons in the external circuit circuit. During charging,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M8/18
CPCH01M4/8885H01M4/9016H01M4/9083H01M8/188H01M2004/8684H01M2300/002Y02E60/50
Inventor 赖勤志李先锋张华民刘新运郑建伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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