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Study on conductivity of electrolyte in aqueous Zn-Mn battery
Received date: 2024-01-08
Online published: 2024-02-05
As one of the important components in aqueous Zn-Mn battery（AZMB），the electrolyte is not only a carrier of ion transport but also an active substance involved in electrochemical reactions，which has an important impact on AZMB cycle life and power density.The study of thermodynamic properties is conducive to determine optimal composition and molality under different working conditions in electrolytes，which optimizes battery design and improves performance.There have been research on the water system of VOSO4 electrolytes，but there is a lack of relevant studies on MnSO4 electrolytes.In this paper，the conductivity of manganese sulfate dilute solution with a molality range of 0.001~0.1 mol/kg was measured at 283.15~318.15 K.Limiting molar conductivity（Λ0） and dissociation constant（Kd） of ［MnSO4］0 ion pair in the dissociation process were obtained from the Fuoss method and Shedlovsky method.The calculative data was reliable compared with other divalent ions.The thermodynamic function of the dissociation process was obtained by fitting the equation of Kd and temperature，and the ionic interaction of Mn2+，SO42-，and water molecules during the dissociation process was deeply discussed.The key step of the dissociation of ［MnSO4］0 ion pair was the process in which water molecules were fixed around the hydration layer of Mn2+ to enhance the order of the system.This study provided basic theoretical support for analyzing the ionic structure and optimizing performance in manganese electrolytes.
QIN Ye , LIU Chang , HAN Song , WANG Shuo . Study on conductivity of electrolyte in aqueous Zn-Mn battery[J]. Inorganic Chemicals Industry, 2024 , 56(11) : 132 -138 . DOI: 10.19964/j.issn.1006-4990.2024-0013
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