Electrochemical Performance of LiMn 2 O 4 Cathodes in Zn-Containing Aqueous Electrolytes

Electrochemical properties of LiMn2O4 cathode were investigated in three types of Zn-containing electrolytes: lithium-zinc sulfate electrolyte (1M ZnSO4 / 2M Li2SO4), zinc sulfate electrolyte (2MZnSO4) and lithium-zinc-manganese sulfate electrolyte (1MZnSO4 / 2MLi2SO4 / 0.1MMnSO4). Cyclic voltammetr...

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Published inJournal of electrochemical science and technology Vol. 13; no. 2; pp. 177 - 185
Main Authors Kamenskii, Mikhail A, Eliseeva, Svetlana N, Volkov, Alexey I, Kondratiev, Veniamin V
Format Journal Article
LanguageKorean
Published 2022
Subjects
Hybrid Zinc Battery
Aqueous Electrolyte
Energy Storage
Electrochemical Performance
Lithium Manganese Spinel
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Summary:Electrochemical properties of LiMn2O4 cathode were investigated in three types of Zn-containing electrolytes: lithium-zinc sulfate electrolyte (1M ZnSO4 / 2M Li2SO4), zinc sulfate electrolyte (2MZnSO4) and lithium-zinc-manganese sulfate electrolyte (1MZnSO4 / 2MLi2SO4 / 0.1MMnSO4). Cyclic voltammetry measurements demonstrated that LiMn2O4 is electrochemically inactive in pure ZnSO4 electrolyte after initial oxidation. The effect of manganese (II) additive in the zinc-manganese sulfate electrolyte on the electrochemical performance was analyzed. The initial capacity of LiMn2O4 is higher in presence of MnSO4 (140 mAh g-1 in 1 M ZnSO4 / 2 M Li2SO4 / 0.1 M MnSO4 and 120 mAh g-1 in 1 M ZnSO4 / 2MLi2SO4). The capacity increase can be explained by the electrodeposition of MnOx layer on the electrode surface. Structural characterization of postmortem electrodes with use of XRD and EDX analysis confirmed that partially formed in pure ZnSO4 electrolyte Zn-containing phase leads to fast capacity fading which is probably related to blocked electroactive sites.
Bibliography:KISTI1.1003/JNL.JAKO202216054084524
ISSN:2093-8551
2288-9221