Utilization of hyper-dendritic zinc during high rate discharge in alkaline electrolytes

Greg Davies, Andrew G. Hsieh, Marcus Nils Hultmark, Michael Edward Mueller, Daniel A. Steingart

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Zinc is a low cost and abundant material, and its strong reducing potential combined with stability in aqueous solutions give it high energy density and safety. It is, therefore, known to be an excellent choice of anode for a wide range of battery designs. However, this material presents some challenges for use in a secondary battery, including morphology changes and dendrite growth during charge (Zn deposition), and low utilization during discharge (Zn dissolution). Low utilization is related to a combination of corrosion and passivation effects. In this paper, we demonstrate a hyper-dendritic (HD) zinc morphology that has a high surface area and allows for rapid discharge in a completely freestanding system with no binders or conductive additives, while still maintaining significantly higher utilization than typical zinc morphologies. At rates of 2.5 A/g, the HD zinc has a utilization level approximately 50% higher than typical zinc granules or dust. Furthermore, we demonstrate that, through tuning of the electrolyte with specific additives, we are able to further increase the utilization of the material at high rate discharge by up to 30%.

Original languageEnglish (US)
Pages (from-to)A1340-A1347
JournalJournal of the Electrochemical Society
Volume163
Issue number7
DOIs
StatePublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Utilization of hyper-dendritic zinc during high rate discharge in alkaline electrolytes'. Together they form a unique fingerprint.

  • Cite this