Transformation of leaf-like zinc dendrite in oxidation and reduction cycle

Akiyoshi Nakata, Haruno Murayama, Katsutoshi Fukuda, Tomokazu Yamane, Hajime Arai, Toshiro Hirai, Yoshiharu Uchimoto, Jun Ichi Yamaki, Zempachi Ogumi

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Abstract

Abstract Zinc is a promising negative electrode material for aqueous battery systems whereas it shows insufficient rechargeability for use in secondary batteries. It has been reported that leaf-like dendrite deposits are often the origin of cell-failure, however, their nature and behavior on discharge (oxidation) - charge (reduction) cycling have been only poorly understood. Here we investigate the transformation of the leaf-like zinc dendrites using ex-situ scanning electron microscopy, X-ray computational tomography and in-situ X-ray diffraction. It is shown that the leaf-like zinc dendrites obtained under diffusion-limited conditions are nearly completely dissolved at a low oxidation current density of 1 mA cm-2 and cause re-evolution of the zinc dendrites. Oxidation at a high current density of 10 mA cm-2 leads to the formation of leaf-like zinc oxide residual products that result in particulate zinc deposits in the following reduction process, enabling good rechargeability. The reaction behavior of this oxide residue is detailed and discussed for the development of long-life zinc electrodes.

Original languageEnglish
Article number24602
Pages (from-to)82-87
Number of pages6
JournalElectrochimica Acta
Volume166
DOIs
Publication statusPublished - Jun 1 2015
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Nakata, A., Murayama, H., Fukuda, K., Yamane, T., Arai, H., Hirai, T., ... Ogumi, Z. (2015). Transformation of leaf-like zinc dendrite in oxidation and reduction cycle. Electrochimica Acta, 166, 82-87. [24602]. https://doi.org/10.1016/j.electacta.2015.03.076