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Method for cleaning negative electrode of zinc-nickel flow battery through charge-discharge strategy

A liquid flow battery, charge and discharge technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve problems such as insufficient zinc concentration, zinc dendrites piercing the diaphragm, etc., to improve cycle life and prevent further dendrite formation Effect

Pending Publication Date: 2020-09-04
SUZHOU WATFONE BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem of zinc dendrites piercing the diaphragm and insufficient zinc concentration in the electrolyte caused by the accumulation of zinc in the negative electrode of the traditional zinc-nickel flow battery for a long time

Method used

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  • Method for cleaning negative electrode of zinc-nickel flow battery through charge-discharge strategy
  • Method for cleaning negative electrode of zinc-nickel flow battery through charge-discharge strategy
  • Method for cleaning negative electrode of zinc-nickel flow battery through charge-discharge strategy

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Refer to attached image 3 , after the battery is normally discharged at 0.5C to 1.2V cut-off, with a current of 0.5A (2.08mAh / cm 2 ) Normal cycle after constant current and constant capacity discharge to see battery performance. The battery has been over-discharged a total of 3 times, respectively for 3000 / 3000 / 6000mAh constant-capacity over-discharge, as shown in the following discharge strategy:

[0022]

[0023]

[0024] From attached image 3 We can see that when the negative electrode is over-discharged, there will be three platforms in the battery voltage platform, which are respectively 0.4V, 0.1V and -0.75V. Under the current and voltage conditions described above, the over-discharge cleaning strategy has no harmful effects on the Coulombic efficiency and energy efficiency of the battery. However, for the sake of safety, the present invention still adopts 0.1V as the limit discharge cut-off voltage.

Embodiment 2

[0026] Refer to attached figure 2 , in the absence of negative electrode cleaning, due to the continuous accumulation of negative electrode zinc ions, the charging time of the battery gradually increases, and the charging time is between 1-200 cycles, increasing from 1h55 min to 2h50 min. If the battery is not treated, the battery will gradually decay until it cannot be recovered.

[0027] Refer to attached Figure 4 , after 236 cycles of normal battery charge and discharge cycle, the battery charging time increases to 4h07min, the battery charge and discharge efficiency is 98.88%, and then an over-discharge maintenance is performed after 237-238 cycles, including the following steps: the battery is 0.2C The rate condition is constant current Discharge to a cut-off voltage of 1.2V, and then discharge the battery at a constant current rate of 0.05C, with a cut-off voltage of 0.1V. After over-discharging and cleaning, cycle for several laps, and the battery returns to normal ...

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Abstract

The invention provides a method for cleaning a negative electrode of a zinc-nickel flow battery through a charging and discharging strategy. According to the cleaning method, the over-discharge current and the cut-off voltage are fixed; on the premise of ensuring that the positive electrode and the negative electrode are not damaged, the phenomenon of negative electrode zinc accumulation caused bydifferent coulombic efficiencies of the positive electrode and the negative electrode of the battery is eliminated, the charging time of the battery is greatly recovered after the battery is cleaned,and the charging and discharging efficiency of the battery is not influenced, so that the charging and discharging cycle times of the zinc-nickel flow battery are greatly increased.

Description

technical field [0001] The invention relates to the field of zinc-ion batteries, in particular to a method for cleaning the negative electrode of a zinc-nickel redox flow battery through a charge-discharge strategy. Background technique [0002] Flow battery is an electrochemical energy storage technology proposed by Thaller (NASA Lewis Research Center, Cleveland, United States) in 1974. The flow energy storage battery system is composed of stack unit, electrolyte solution, electrolyte solution storage and supply unit, control management unit and other parts. The core of the liquid flow battery system is composed of a stack and (the stack is composed of dozens of nodes for oxidation-reduction reactions) and single cells that realize the charging and discharging process in series according to specific requirements. The structure is similar to that of a fuel cell stack. [0003] The electrochemical reaction of the flow battery requires the flow of the electrolyte, and its act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 侯腾腾苏玉宽张益宁
Owner SUZHOU WATFONE BATTERY TECH CO LTD