Publication
Article Metrics
Citations
Online attention
X-ray imaging and micro-spectroscopy unravel the role of zincate and zinc oxide in the cycling of zinc anodes in mildly acidic aqueous electrolytes
DOI:
10.1016/j.jpowsour.2022.231063
Authors:
Majid
Kazemian
(Diamond Light Source)
,
Francesca
Rossi
(University of Salento)
,
Andrea
Casaroli
(Politecnico di Milano)
,
Tommaso
Caielli
(Politecnico di Milano)
,
Burkhard
Kaulich
(Diamond Light Source)
,
Maya
Kiskinova
(Elettra – Sincrotrone Trieste)
,
Ivonne
Sgura
(University of Salento)
,
Benedetto
Bozzini
(Politecnico di Milano)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Journal Of Power Sources
, VOL 524
State:
Published (Approved)
Published:
March 2022
Diamond Proposal Number(s):
22398

Abstract: Sustainability, environmental and safety concerns raised by the increasing demand of batteries are driving research towards post-lithium technologies. Rechargeable Zn batteries are strong candidates, but still not practically viable, owing to the extensively studied, but poorly understood unstable behavior of Zn metal upon discharge-charge cycling. This limiting factor warrants more fundamental investigations and the present report provides the lacking molecular-level information on the Zn-based compounds forming at the electrode/electrolyte interface as a result of electrochemical cyclic in weakly acidic aqueous electrolyte. The results are obtained using ex situ X-ray absorption spectromicroscopy maps, modelled mathematically and complemented with cyclic voltammetry, symmetric-cell tests and electron microscopy. We have identified the role of the zincate precipitation resulting from local alkalinization during recharge, combined with additional zincate formation and decomposition to zinc oxide during discharge. The mathematical model allowed a transparent interpretation of morphochemical changes observed. The synergy of these processes leads to electrochemical localization effects, resulting in the formation of a complexly structured and low conductive ZnO-based template, that might play a role in driving shape changes.
Journal Keywords: Zn anode; Mildly acidic; Zincate; X-ray absorption spectroscopy; STXM; Hyperspectral mapping
Diamond Keywords: Batteriesl Zinc-ion
Subject Areas:
Materials,
Chemistry,
Energy
Instruments:
I08-Scanning X-ray Microscopy beamline (SXM)
Added On:
07/02/2022 09:56
Documents:
1-s2.0-S0378775322000878-main.pdf
Discipline Tags:
Energy Storage
Energy
Physical Chemistry
Energy Materials
Chemistry
Materials Science
Technical Tags:
Spectroscopy
X-ray Absorption Spectroscopy (XAS)