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A method for activating the positive electrode of a zinc-nickel single flow battery

A technology of flow battery and activation method, applied in the direction of regenerative fuel cell, etc., can solve the problems of multi-zinc element, system stability hazards, etc., and achieve the effect of improving cycle stability

Active Publication Date: 2022-03-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for activating the positive electrode of a zinc-nickel single flow battery
  • A method for activating the positive electrode of a zinc-nickel single flow battery
  • A method for activating the positive electrode of a zinc-nickel single flow battery

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Embodiment 1

[0019] Positive pole 800cm 2 Nickel hydroxide electrode with a surface capacity of 40mAh / cm 2 ; Use 800cm 2 Zinc sheet and 800cm 2 The carbon felt is composited together as the negative electrode; the capacity of the zinc sheet is 5mAh / cm 2 ; The activated electrolyte is 6L of aqueous solution of 4mol / L potassium hydroxide; adopt 0.1C (4mA / cm 2 ) current density for charge and discharge cycles, the charge cut-off condition is a voltage of 2.0V, and the discharge cut-off condition is a voltage of 0.5V. After several cycles of activation, the coulombic efficiency calculated based on the ratio of discharge to charge electricity reaches 90%, so the activation is terminated. After the activation is terminated, replace the activated electrolyte with 6L of an alkaline solution containing 0.5 mol / L zinc ions and 4 mol / L potassium hydroxide used when the zinc-nickel single-flow battery works normally, and carry out the normal operation of the battery: Using 40mA / cm 2 The current ...

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Abstract

A method for activating the positive electrode of a zinc-nickel single flow battery, characterized in that: the positive electrode is a nickel hydroxide electrode, and the negative electrode uses carbon felt and / or zinc sheet as the electrode; before the normal operation of the battery, an activated electrolyte is used for charge and discharge cycle, according to The coulombic efficiency of the battery calculated by the ratio of discharge to charge power reaches more than 90%, which is regarded as the termination of activation; the activation electrolyte is an alkaline solution without zinc ions; the specific activation method is 0.1-1C, preferably 0.1-0.2 The current density of C is used for charging and discharging cycles. The charging cut-off condition is that the voltage is not higher than 2V for a single battery, and the discharge cut-off condition for a single battery is that the voltage is not lower than 0.5V.

Description

technical field [0001] The invention relates to the field of zinc-nickel single-flow batteries, in particular to a method for activating the positive electrode of the zinc-nickel single-flow battery. Background technique [0002] Zinc-nickel single flow battery is a new type of low-cost, high-efficiency, and environment-friendly flow battery energy storage technology. It has the advantages of high energy density and current efficiency, simple and easy-to-operate device, long service life, and low cost. It is mainly used in power grid peak shaving, renewable energy power generation such as wind energy and solar energy, electric vehicles and other fields. [0003] The application of zinc-nickel single-flow batteries in the field of large-scale energy storage requires high energy storage capacity, which puts forward requirements for high-capacity cathodes. However, as the capacity increases, the electrolyte transport of the positive electrode becomes more and more difficult, r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 赖勤志李先锋张华民宋杨许鹏程刘新运郑建伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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