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Abstract The application of aqueous zinc‐ion batteries (AZIBs) with Zn metal anode is hindered by severe dendritic growth, corrosion, and inefficient Zn utilization. “Rocking‐chair” type AZIBs are considered a viable approach toward practical applications due to the success of commercial lithium‐ion batteries employing intercalated graphite anodes. Herein, a new type of layered titanium phosphate Ti 2 O 3 (H 2 PO 4 ) 2 ·2H 2 O is proposed for the first time as the intercalated anodes for AZIBs, exhibiting a capacity of 108 mAh g −1 at 50 mA g −1 , with a low discharge potential of 0.17 V (vs. Zn 2+ /Zn). The ion insertion process is thoroughly investigated, and a micro‐dendrite growth‐corrosion mode is proposed to explain the capacity degradation mechanism. Corresponding countermeasures are designed, resulting in a significant improvement in cycle life. When coupled with a zinc hexacyanoferrate (KZnHCF) cathode, the “rocking‐chair” full battery exhibits an ultralong lifespan of 50000 cycles (111 days) at 2000 mA g −1 with 94% capacity retention. This work presents a novel perspective for the development of practical AZIBs.
Guo et al. (Tue,) studied this question.