Increasing the Cycle Life of Zinc Metal Anodes and Nickel-Zinc Cells Using Flow-Through Alkaline Electrolytes

Shuhua Shan, Mihir N. Parekh, Rong Kou, Donghai Wang, Christopher D. Rahn

Research output: Contribution to journalArticlepeer-review

Abstract

Alkaline electrolyte flow through porous Zn anodes and Ni(OH)2 cathodes can overcome diffusion limits, reduce dendrite growth, and improve cycle life. Zinc deposition morphology improves with low flow rates electrolyte in KOH/ZnO electrolytes at current densities near the diffusion-limit regime. Zinc dendrites present without flow are suppressed by micrometer-per-second flow at concentrations ranging from 0.2 to 0.6 M ZnO dissolved in 6 M and 10 M KOH solutions. Zn-Cu asymmetric cell tests reveal that flowing electrolyte increases the lifespan by more than 6 times in the diffusion-limit regime by suppressing gas evolution and dendrite formation. Ni-Zn cell tests show that a flow-assisted battery cycles 1500 times with over 95% Coulombic efficiency (CE) at 35 mA cm−2 current density and 7 mAh/cm2 charge capacity, increasing the battery lifespan by 17 times compared with a stagnant Ni-Zn cell.

Original languageEnglish (US)
Article number032503
JournalJournal of the Electrochemical Society
Volume171
Issue number3
DOIs
StatePublished - Mar 31 2024

All Science Journal Classification (ASJC) codes

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

Cite this