AZ31 magnesium alloy with ultrafine grains as the anode for Mg-air battery

Naiguang Wang, Yixiang Huang, Jingjing Liu, Xusheng Yang, Weipeng Xie, Qiong Cai (Corresponding Author), Songyuan Zheng, Zhicong Shi (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Fabricating the magnesium alloy with fine grains, low dislocation density, and weak grain orientation is of crucial importance to enhance its anode performance for primary aqueous battery. However, this structure mode can hardly be realized for bulk magnesium alloy via the conventional approaches such as plastic working. Herein, we construct an AZ31 magnesium alloy with ultrafine grains (667.28 ± 291.35 nm) by using the spark plasma sintering of the alloy powder that has been treated via high-energy ball milling. This alloy exhibits weak grain orientation and its dislocation density is not increased compared to the precursor alloy. Benefiting from the unique microstructure, the modified AZ31 displays significantly more active behaviour with enhanced capacity during the discharge of Mg-air battery, as compared with the precursor AZ31 that has the grain size of 472.89 ± 154.31 μm. Furthermore, the impact of ultrafine grains on the discharge behaviour is also analysed based on microstructure characterization and electrochemical response.
Original languageEnglish
Article number138135
JournalElectrochimica Acta
Volume378
DOIs
Publication statusPublished - 10 May 2021

Keywords

  • AZ31 magnesium anode
  • Discharge behaviour
  • Mg-air battery
  • Ultrafine grains

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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