Organic/inorganic double solutions for magnesium-air batteries

Jingling Ma; Pengfei Hu; Xingliang Jia; Chenfei Zhang; Guangxin Wang

doi:10.1039/d0ra10528g

Organic/inorganic double solutions for magnesium-air batteries

RSC Adv. 2021 Feb 15;11(13):7502-7510. doi: 10.1039/d0ra10528g. eCollection 2021 Feb 10.

Authors

Jingling Ma^{1

2

3}, Pengfei Hu⁴, Xingliang Jia¹, Chenfei Zhang¹, Guangxin Wang¹

Affiliations

¹ Research Center for High Purity Materials, Henan University of Science and Technology Luoyang 471023 PR China wanggx2016@126.com +86 379 64230597 +86 379 64231269.
² Collaborative Innovation Center of Nonferrous Metals, Henan Province, Henan University of Science and Technology Luoyang 471023 PR China.
³ Henan Key Laboratory of Non-ferrous Materials Science & Processing Technology, Henan University of Science and Technology Luoyang 471023 PR China.
⁴ School of Materials Science and Engineering, Luoyang Institute of Science and Technology Luoyang 471023 PR China.

Abstract

In order to limit the anode corrosion and improve the battery activity, magnesium-air batteries with organic/inorganic double solutions (0.5 M Mg(ClO₄)₂-N,N-dimethylformamide (DMF)/0.6 M NaCl-H₂O, 0.5 M Mg(ClO₄)₂-acetonitrile (AN)/0.6 M NaCl-H₂O) were prepared. The discharge performance, discharge morphology, and corrosion performance of magnesium anode were researched. Results obtained show that organic electrolytes separate the anode from the aqueous electrolyte, thus improving the anode utilization rate. Due to the NaCl electrolyte used in the air cathode side, batteries show higher discharge voltages. As an example, a better discharge performance has been observed in Mg(ClO₄)₂-DMF/NaCl-H₂O double electrolytes at 1 mA cm^-2 discharge. This is attributed to there being no obvious absorption of corrosion products on the anode surface. The results of the discharge morphology and electrochemical impedance spectroscopy agree well with the discharge performance. The magnesium anode discharge mechanism is different for different solutions.