Zinc-ion Anchor Induced Highly Reversible Zn Anodes for High Performance Zn-ion Batteries

Angew Chem Int Ed Engl. 2024 Apr 5:e202403050. doi: 10.1002/anie.202403050. Online ahead of print.ABSTRACTUnstable Zn interface with serious detrimental parasitic side-reactions and uncontrollable Zn dendrites severely plagues the practical application of aqueous zinc-ion batteries. The interface stability was closely related to the electrolyte configuration and Zn2+ depositional behavior. In this work, a unique Zn-ion anchoring strategy is originally proposed to manipulate the coordination structure of solvated Zn-ions and guide the Zn-ion depositional behavior. Specifically, the amphoteric charged ion additives (denoted as DM), which act as zinc-ion anchors, can tightly absorb on the Zn surface to guide the uniform zinc-ion distribution by using its positively charged -NR4+ groups. While the negatively charged -SO3- groups of DM on the other hand, reduces the active water molecules within solvation sheaths of Zn-ions. Benefiting from the special synergistic effect, Zn metal exhibits highly ordered and compact (002) Zn deposition and negligible side-reactions. As a result, the advanced Zn||Zn symmetric cell delivers extraordinarily 7000 hours long lifespan (0.25 mAh cm-2, 0.25 mAh cm-2). Additionally, based on this strategy, the NH4V4O10llZn pouch-cell with low negative/positive capacity ratio (N/P ratio=2.98) maintains 80.4% capacity retention for 180 cycles. A more practical 4 cm*4 cm sized pouch-cell could be steadily cycled in a high output capacity of 37.0 mAh over 50 c...
Source: Angewandte Chemie - Category: Chemistry Authors: Source Type: research