Aqueous Aluminum Cells: Mechanisms of Aluminum Anode Reactions and Role of the Artificial Solid Electrolyte Interphase

Yonglei Zhang, Yinghui Bian, Zichuan Lv, Yuqing Han, Meng Chang Lin

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Electrochemical cells with aluminum (Al) as the active material offer the benefits of high energy density, low cost, and high safety. Although several research groups have assembled rechargeable Al//MxOy (M = Mn, V, etc) cells with 2 m aqueous Al trifluoromethanesulfonate as an electrolyte and demonstrated the importance of the artificial solid electrolyte interphase (ASEI) on the Al anode for realizing high rechargeable capacity, the reactions of the Al anode in such cells remain underexplored. Herein, we investigate the effects of the ASEI on the charge/discharge cycling stability and activity of Al cells with the abovementioned aqueous electrolyte and reveal that this interphase provides chloride anions to induce the corrosion of Al rather than to support the transportation of Al3+ ions during charge/discharge. Regardless of the ASEI presence/absence, the main reactions at the Al anode during charge/discharge cycling are identified as oxidation and gas evolution, which suggests that the reduction of Al in the employed electrolyte is irreversible. The simple introduction of chloride anions (e.g., 0.15 m NaCl) into the electrolyte is shown to allow the realization of an Al//MnO2 cell with superior performance (discharge working voltage ≈ 1.5 V and specific capacity = 250 mA h/g). Thus, the present work unveils the mechanisms of reactions occurring at the Al anode of aqueous electrolyte Al cells to support their further development.

Original languageEnglish
Pages (from-to)37091-37101
Number of pages11
JournalACS Applied Materials and Interfaces
Volume13
Issue number31
DOIs
Publication statusPublished - Aug 11 2021
Externally publishedYes

Keywords

  • aluminum batteries
  • aqueous electrolyte
  • corrosion reaction
  • hydrogen evolution reaction
  • manganese dioxide
  • solid electrolyte interphase

ASJC Scopus subject areas

  • Materials Science(all)

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