Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 33, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202210290
Keywords
anti-corrosion; rheological property; semi-liquid electrodes; stress relaxation; Zn powder
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In this study, a dendrite-free and anti-corrosive semi-liquid Zn anode (SLA) was successfully fabricated based on Zn powder and a thickening agent. The unique anode effectively releases the stress induced by Zn plating, especially under high-current densities, and the dual-conductive medium allows for homogeneous ion flux. This study provides an electrode rheology-based approach to overcome the stability challenge of powder anode.
Zn powder anode possesses great versatility compared to the Zn foil counterpart, but the rough surface with a high surface area aggravates the corrosion and dendrite growth. Herein, a dendrite-free and anti-corrosive semi-liquid Zn anode (SLA) is successfully fabricated based on Zn powder and a thickening agent. Benefiting from the rheological property, the unique anode effectively releases the stress induced by Zn plating, especially under high-current densities. Meanwhile, the dual-conductive medium, i.e., ionic and electronic, homogenizes the ion flux and allows the stripping/plating to occur within the entire anode. In a symmetric cell, the SLA anode exhibits stable electrochemical behavior with a prolonged lifespan at the current density of 5 mA cm(-2)/10 mA cm(-2) under the capacity of 5 mAh cm(-2)/10 mAh cm(-2). Improved durability of more than 5000 cycles is endowed when assembling an SLA anode with a vanadium-based cathode. This study provides an electrode rheology-based approach to overcome the stability challenge of powder anode for scale-up manufacturing.
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