Steel Anti-Corrosion Strategy Enables Long-Cycle Zn Anode

摘要

The progress of aqueous zinc batteries (AZBs) is limited by the poor cyclinglife due to Zn anode instability, including dendrite growth, surface corrosion,and passivation. Inspired by the anti-corrosion strategy of steel industry, acompounding corrosion inhibitor (CCI) is employed as the electrolyte additivefor Zn metal anode protection. It is shown that CCI can spontaneously generatea uniform and ≈30 nm thick solid-electrolyte interphase (SEI) layer onZn anode with a strong adhesion via ZnO bonding. This SEI layer efficientlyprohibits water corrosion and guides homogeneous Zn deposition withoutobvious dendrite formation. This enables reversible Zn deposition and dissolutionfor over 1100 h under the condition of 1 mA cm~(?2) and 1 mAh cm~(?2) insymmetric cells. The Zn-MnO_2 full cells with CCI-modified electrolyte deliveran ultralow capacity decay rate (0.013% per cycle) at 0.5 A g~(?2) over 1000cycles. Such an innovative strategy paves a low-cost way to achieve AZBswith long lifespan.