Abstract
Magnesium (Mg) is a promising anode material for primary Mg batteries because of its outstanding characteristics, such as abundance, light weight, and low cost. However, self-corrosion and delayed action of Mg alloy in aqueous solution limit its performance and reduce the energy density. In this work, the influence of NaF–Na3PO4 on electrochemical behaviors of Mg alloy in composite solution is studied by electrochemical impedance spectroscopy, galvanostatic discharge, and linear sweep voltammetry. The morphology and microstructure are analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy. Impedance studies show that NaF and Na3PO4 are good inhibitors with the inhibition efficiency reaches 98.8%. Moreover, the delayed time is reduced to 0.08 s, despite that soaking time length is extended to 16 days. A Mg–MnO2 cell demonstrates an excellent discharge capacity of 1539 mAh g−1 at the discharge current density of 5 mA cm−2.
Graphical abstract
Schematic diagram of the assembly of Mg–MnO2 battery
Galvanostatic (5 mA cm−2) discharge curves for Mg–MnO2 batteries in different solutions without (a) and with (b) NaF–Na3PO4. The delayed time is reduced and the anodic specific capacity is enhanced to 1539 mAh g−1 by the addition of NaF and Na3PO4.
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This work was supported by National Natural Science Foundation of China (No. 21273292).
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Xu, J., Yang, Q., Huang, C. et al. Influence of additives fluoride and phosphate on the electrochemical performance of Mg–MnO2 battery. J Appl Electrochem 47, 767–775 (2017). https://doi.org/10.1007/s10800-017-1074-1
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DOI: https://doi.org/10.1007/s10800-017-1074-1