A kind of reduction regeneration agent of lead methanesulfonate electrolyte and the reduction regeneration method of lead methanesulfonate electrolyte

Abstract

The invention discloses a reduction regeneration agent for a lead methanesulfonate electrolyte and a method for carrying out reduction regeneration on the electrolyte of a lead methanesulfonate flow battery which is short-circuited or is relatively low in efficiency by using the reduction regeneration agent. The reduction regeneration agent is a water solution containing H2O2 and CH3SO3H; and thereduction regeneration method comprises the following steps of detecting the molar concentration of remaining active Pb<2+> in the electrolyte of the lead methanesulfonate flow battery which is short-circuited or is relatively low in efficiency; calculating the additive amount of the reduction regeneration agent according to the concentration of the remaining active Pb<2+>; and injecting the reduction regeneration agent into the electrolyte, controlling the injection rate and completing reduction regeneration of the electrolyte when no obvious bubble is generated at a reflux inlet of a liquidstorage tank. According to the reduction regeneration agent and the reduction regeneration method, the condition that the concentration of the Pb<2+> in the electrolyte of the battery which is short-circuited or is relatively low in efficiency is restored to be close to an initial state can be achieved, thereby achieving the targets of improving the charge-discharge cycle efficiency of the batteryand prolonging the cycle life of the battery.

Description

technical field [0001] The invention relates to the technical field of lead methanesulfonate flow batteries, in particular to a reduction and regeneration agent for the electrolyte of lead methanesulfonate flow batteries and the use of the reduction regeneration agent for short-circuited or low-efficiency lead methanesulfonate A method for maintaining and restoring the electrolyte of the flow battery. Background technique [0002] The unique design of the lead methanesulfonate flow battery without a diaphragm and single flow has attracted much attention. During the charging process, the soluble Pb in the electrolyte 2+ React at the positive and negative electrodes to form PbO 2 and Pb solids, when discharged, PbO 2 and Pb are respectively reduced and oxidized to form soluble Pb 2+ Entering the electrolyte, this cycle completes the process of energy storage and energy use. Experiments have found that when the charge-discharge cycle exceeds 50 times, the Coulombic efficien...

AI Technical Summary

Problems solved by technology

At this time, in the lead methanesulfonate flow battery, there is a large amount of elemental Pb on the negative plate, and the generated dendrites contact the positive electrode to cause an open circuit phenomenon; while the charge and discharge cycle on the positive plate, the pole A large amount of PbO remains on the board 2 Precipitation, in the form of paste (α-PbO 2 Gradually transform into β-PbO 2 ), and it is easy to fall off into the electrolyte, thereby reducing the Pb in the electrolyte 2+ The concentration of the battery will inevitably affect the cycle performance of the battery, that is, the reduction of Coulomb and energy efficiency

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