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Rechargeable aqueous zinc-ion batteries (ZIBs) hold great promise for large-scale energy storage, but their development is hindered by limited Zn-ion storage capacity and severe Zn dendrite formation. Herein, we conceptually demonstrate the significantly boosted electrochemical performance and efficiently suppressed Zn dendrites in the aqueous Zn hybrid-ion batteries based on high-quality Prussian blue analogues (PBAs)-type binder-free cathode, metallic Zn anode and aqueous K + /Zn 2+ electrolyte. The binder-free cathode (CC/CKFeCs) is synthesized through growing well-crystallized potassium iron hexacyanoferrate hydrate nanocubes on flexible carbon cloth (CC) supported with N-doped carbon fiber arrays. It is discovered that reversibly co-insertion/extraction of K + and Zn 2+ charge carriers is occurred within the CC/CKFeCs cathode, simultaneously, and K + ions are preferred to accumulate on the Zn anode surface to suppress the unwanted Zn dendrite growth via electrostatic repulsion. Remarkably, the assembled aqueous Zn//CC/CKFeCs hybrid-ion batteries exhibit a high reversible specific capacity of 0.73 mAh cm ‒2 at 1 mA cm ‒2 , a decent rate capability of 0.39 mAh cm ‒2 at 20 mA cm ‒2 and enhanced cycling stability with 75% capacity retention after 1000 cycles. Furthermore, a flexible soft-packaged hybrid-ion battery using Zn nanosheets (Zn-NS) as the anode and CC/CKFeCs as the cathode is successfully assembled, showing strong potential for practical applications.
Xu et al. (Thu,) studied this question.