Morphology Control of Electrodeposited Zinc from Alkaline Zincate Solutions for Rechargeable Zinc Air Batteries | Zendy

Nima Shaigan | Zendy; Wei Qu | Zendy; Tabitha Takeda | Zendy

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Morphology Control of Electrodeposited Zinc from Alkaline Zincate Solutions for Rechargeable Zinc Air Batteries

Author(s) -

Nima Shaigan,

Wei Qu,

Tabitha Takeda

Publication year - 2010

Publication title -

ecs transactions

Language(s) - French

Resource type - Journals

SCImago Journal Rank - 0.235

H-Index - 52

eISSN - 1938-6737

pISSN - 1938-5862

DOI - 10.1149/1.3507925

Subject(s) - zincate , electrolyte , nucleation , alkaline battery , zinc , deposition (geology) , morphology (biology) , electrochemistry , materials science , chemical engineering , duty cycle , metallurgy , chemistry , electrode , voltage , paleontology , genetics , organic chemistry , sediment , engineering , biology , physics , quantum mechanics

Anomalous electrocrystallization of Zn in alkaline electrolytes is one of the hurdles hindering the development and Commercialization of secondary alkaline Zn batteries. The issue stems from the fast electrochemical kinetics of Zn in alkaline electrolytes. Pulse deposition enables the use of high peak current densities and overpotentials, increases the nucleation rate and improves the deposit morphology. The cathodic behavior of Zn and effect of pulse parameters including duty cycle and frequency on the deposit morphology were studied for electrolytes containing 4, 6 and 9 M KOH. It was shown that in order to attain fine-grain, smooth deposits by pulse deposition, application of small duty cycles and high frequencies are essential. Pulse deposition, however, does not improve the morphology in case highly concentrated KOH electrolytes are used.L\u2019\ue9lectrocristallisation anormale du zinc dans les \ue9lectrolytes alcalins constitue l\u2019un des obstacles qui freinent la mise au point et la commercialisation de piles secondaires alcalines au zinc. Ce probl\ue8me est attribuable \ue0 la cin\ue9tique \ue9lectrochimique rapide du zinc dans ces types d\u2019\ue9lectrolytes. L\u2019\ue9lectrod\ue9position puls\ue9e permet d\u2019utiliser des densit\ue9s de courant de pic et des surtensions \ue9lev\ue9es, d\u2019augmenter le taux de nucl\ue9ation et d\u2019am\ue9liorer la morphologie du d\ue9p\uf4t. Le comportement cathodique du zinc et l\u2019effet des param\ue8tres d\u2019impulsion sur la morphologie du d\ue9p\uf4t, dont le cycle d\u2019utilisation et la fr\ue9quence, ont \ue9t\ue9 \ue9tudi\ue9s pour des \ue9lectrolytes dont la concentration en KOH \ue9tait de 4, 6 et 9 molaires. Les r\ue9sultats montrent que pour obtenir des d\ue9p\uf4ts homog\ue8nes et fins par \ue9lectrod\ue9position puls\ue9e, l\u2019application de petits facteurs de charge et de hautes fr\ue9quences est essentielle. Toutefois, l\u2019\ue9lectrod\ue9position puls\ue9e n\u2019am\ue9liore pas la morphologie lorsque l\u2019on utilise un \ue9lectrolyte tr\ue8s concentr\ue9 en KOH.Peer reviewed: YesNRC publication: Ye

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